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The necessity of being together
COVID-19 has prompted many changes in pediatric health care. They say necessity is the mother of invention. Sometimes, necessity is the motivator for the long-past-due adoption of a previous invention, such as telemedicine for minor illnesses. And sometimes necessity reminds us about what is really important in a world of high technology.
Unlike our nearly overwhelmed internal medicine, ED, and family physician colleagues, many pediatricians are in a lull that threatens the financial viability of our practices. We are postponing annual well visits. We have fewer sick visits and hospitalizations since respiratory syncytial virus (RSV) and influenza also have been reduced by social distancing. Parents are avoiding the risk of contagion in the waiting room and not bringing their children in for minor complaints. There is more telemedicine – a welcome change in financing and practice whose time has come, but was being delayed by lack of insurance coverage.
Technology has allowed clinicians to respond to the pandemic in ways that would not have been possible a few years ago. Online tools, such as subscription email lists, webinars, and electronic medical news services, provide updates when the information changes weekly on the virus’s contagiousness, asymptomatic and presymptomatic transmission, prevalence, the effectiveness of masks, and experimental treatment options. These changes have been so fast that many journal articles based on data from China were obsolete and contradicted before they appeared in print.
However, technology only helped us to more effectively do what we needed to do in the first place – come together in a world of physical distancing and work toward common goals. In many hospitals, pediatric wards were emptied by reduced RSV admissions and postponed elective surgeries. These units have been converted to accept adult patients up to age 30 or 40 years. Our med-peds colleagues quickly created webinars and online resource packages on topics pediatric hospitalists might need to care for that population. There were refresher courses on ventilator management and reminders that community pediatric hospitalists, who in the winter might have one-third of their admissions with RSV, have more experience managing viral pneumonia than the internists.
Ward teams were created with a pediatric attending and an internal medicine resident. The resident’s familiarity with the names of blood pressure medicines complemented the attending’s years of clinical judgment and bedside manner. People are stepping out of their comfort zones but initial reports from the front lines are that, with each other’s support, we’ve got this.
Mistakes in telemedicine are being made, shared, and learned from. Emergency physicians are collecting anecdotes of situations when things were missed or treatment delayed. Surgeons report seeing increased numbers of cases in which the diagnosis of appendicitis was delayed, which isn’t surprising when a pediatrician cannot lay hands on the belly. Perhaps any case in which a parent calls a second or third time should be seen in the flesh.
Some newborn nurseries are discharging mother and baby at 24 hours after birth and rediscovering what was learned about that practice, which became common in the 1990s. It works well for the vast majority of babies, but we need to be ready to detect the occasional jaundiced baby or the one where breastfeeding isn’t going well. The gray-haired pediatricians can recall those nuances.
Another key role is to help everyone process the frequent deaths during a pandemic. First, there are the families we care for. Children are losing grandparents with little warning. Parents may be overwhelmed with grief while ill themselves. That makes children vulnerable.
Our medical system in 2 months has moved heaven and earth – and significantly harmed the medical care and financial future of our children – trying to assure that every 80-year-old has the right to die while attached to a ventilator, even though only a small fraction of them will survive to discharge. Meanwhile, on the wards, visitation policies have people deteriorating and dying alone. I find this paradigm distressing and antithetical to my training.
Medicine and nursing both have long histories in which the practitioner recognized that there was little they could do to prevent the death. Their role was to compassionately guide the family through it. For some people, this connection is the most precious of the arts of medicine and nursing. We need to reexamine our values. We need to get creative. We need to involve palliative care experts and clergy with the same urgency with which we have automakers making ventilators.
Second, there are our colleagues. Pediatric caregivers, particularly trainees, rarely encounter deaths and can benefit from debriefing sessions, even short ones. There is comfort in having a colleague review the situation and say: “There was nothing you could have done.” Or even: “That minor omission did not alter the outcome.” Even when everything was done properly, deaths cause moral suffering that needs processing and healing. Even if you don’t have magic words to give, just being present aids in the healing. We are all in this, together.
Dr. Powell is a pediatric hospitalist and clinical ethics consultant living in St. Louis. He has no relevant financial disclosures. Email him at pdnews@mdedge.com.
COVID-19 has prompted many changes in pediatric health care. They say necessity is the mother of invention. Sometimes, necessity is the motivator for the long-past-due adoption of a previous invention, such as telemedicine for minor illnesses. And sometimes necessity reminds us about what is really important in a world of high technology.
Unlike our nearly overwhelmed internal medicine, ED, and family physician colleagues, many pediatricians are in a lull that threatens the financial viability of our practices. We are postponing annual well visits. We have fewer sick visits and hospitalizations since respiratory syncytial virus (RSV) and influenza also have been reduced by social distancing. Parents are avoiding the risk of contagion in the waiting room and not bringing their children in for minor complaints. There is more telemedicine – a welcome change in financing and practice whose time has come, but was being delayed by lack of insurance coverage.
Technology has allowed clinicians to respond to the pandemic in ways that would not have been possible a few years ago. Online tools, such as subscription email lists, webinars, and electronic medical news services, provide updates when the information changes weekly on the virus’s contagiousness, asymptomatic and presymptomatic transmission, prevalence, the effectiveness of masks, and experimental treatment options. These changes have been so fast that many journal articles based on data from China were obsolete and contradicted before they appeared in print.
However, technology only helped us to more effectively do what we needed to do in the first place – come together in a world of physical distancing and work toward common goals. In many hospitals, pediatric wards were emptied by reduced RSV admissions and postponed elective surgeries. These units have been converted to accept adult patients up to age 30 or 40 years. Our med-peds colleagues quickly created webinars and online resource packages on topics pediatric hospitalists might need to care for that population. There were refresher courses on ventilator management and reminders that community pediatric hospitalists, who in the winter might have one-third of their admissions with RSV, have more experience managing viral pneumonia than the internists.
Ward teams were created with a pediatric attending and an internal medicine resident. The resident’s familiarity with the names of blood pressure medicines complemented the attending’s years of clinical judgment and bedside manner. People are stepping out of their comfort zones but initial reports from the front lines are that, with each other’s support, we’ve got this.
Mistakes in telemedicine are being made, shared, and learned from. Emergency physicians are collecting anecdotes of situations when things were missed or treatment delayed. Surgeons report seeing increased numbers of cases in which the diagnosis of appendicitis was delayed, which isn’t surprising when a pediatrician cannot lay hands on the belly. Perhaps any case in which a parent calls a second or third time should be seen in the flesh.
Some newborn nurseries are discharging mother and baby at 24 hours after birth and rediscovering what was learned about that practice, which became common in the 1990s. It works well for the vast majority of babies, but we need to be ready to detect the occasional jaundiced baby or the one where breastfeeding isn’t going well. The gray-haired pediatricians can recall those nuances.
Another key role is to help everyone process the frequent deaths during a pandemic. First, there are the families we care for. Children are losing grandparents with little warning. Parents may be overwhelmed with grief while ill themselves. That makes children vulnerable.
Our medical system in 2 months has moved heaven and earth – and significantly harmed the medical care and financial future of our children – trying to assure that every 80-year-old has the right to die while attached to a ventilator, even though only a small fraction of them will survive to discharge. Meanwhile, on the wards, visitation policies have people deteriorating and dying alone. I find this paradigm distressing and antithetical to my training.
Medicine and nursing both have long histories in which the practitioner recognized that there was little they could do to prevent the death. Their role was to compassionately guide the family through it. For some people, this connection is the most precious of the arts of medicine and nursing. We need to reexamine our values. We need to get creative. We need to involve palliative care experts and clergy with the same urgency with which we have automakers making ventilators.
Second, there are our colleagues. Pediatric caregivers, particularly trainees, rarely encounter deaths and can benefit from debriefing sessions, even short ones. There is comfort in having a colleague review the situation and say: “There was nothing you could have done.” Or even: “That minor omission did not alter the outcome.” Even when everything was done properly, deaths cause moral suffering that needs processing and healing. Even if you don’t have magic words to give, just being present aids in the healing. We are all in this, together.
Dr. Powell is a pediatric hospitalist and clinical ethics consultant living in St. Louis. He has no relevant financial disclosures. Email him at pdnews@mdedge.com.
COVID-19 has prompted many changes in pediatric health care. They say necessity is the mother of invention. Sometimes, necessity is the motivator for the long-past-due adoption of a previous invention, such as telemedicine for minor illnesses. And sometimes necessity reminds us about what is really important in a world of high technology.
Unlike our nearly overwhelmed internal medicine, ED, and family physician colleagues, many pediatricians are in a lull that threatens the financial viability of our practices. We are postponing annual well visits. We have fewer sick visits and hospitalizations since respiratory syncytial virus (RSV) and influenza also have been reduced by social distancing. Parents are avoiding the risk of contagion in the waiting room and not bringing their children in for minor complaints. There is more telemedicine – a welcome change in financing and practice whose time has come, but was being delayed by lack of insurance coverage.
Technology has allowed clinicians to respond to the pandemic in ways that would not have been possible a few years ago. Online tools, such as subscription email lists, webinars, and electronic medical news services, provide updates when the information changes weekly on the virus’s contagiousness, asymptomatic and presymptomatic transmission, prevalence, the effectiveness of masks, and experimental treatment options. These changes have been so fast that many journal articles based on data from China were obsolete and contradicted before they appeared in print.
However, technology only helped us to more effectively do what we needed to do in the first place – come together in a world of physical distancing and work toward common goals. In many hospitals, pediatric wards were emptied by reduced RSV admissions and postponed elective surgeries. These units have been converted to accept adult patients up to age 30 or 40 years. Our med-peds colleagues quickly created webinars and online resource packages on topics pediatric hospitalists might need to care for that population. There were refresher courses on ventilator management and reminders that community pediatric hospitalists, who in the winter might have one-third of their admissions with RSV, have more experience managing viral pneumonia than the internists.
Ward teams were created with a pediatric attending and an internal medicine resident. The resident’s familiarity with the names of blood pressure medicines complemented the attending’s years of clinical judgment and bedside manner. People are stepping out of their comfort zones but initial reports from the front lines are that, with each other’s support, we’ve got this.
Mistakes in telemedicine are being made, shared, and learned from. Emergency physicians are collecting anecdotes of situations when things were missed or treatment delayed. Surgeons report seeing increased numbers of cases in which the diagnosis of appendicitis was delayed, which isn’t surprising when a pediatrician cannot lay hands on the belly. Perhaps any case in which a parent calls a second or third time should be seen in the flesh.
Some newborn nurseries are discharging mother and baby at 24 hours after birth and rediscovering what was learned about that practice, which became common in the 1990s. It works well for the vast majority of babies, but we need to be ready to detect the occasional jaundiced baby or the one where breastfeeding isn’t going well. The gray-haired pediatricians can recall those nuances.
Another key role is to help everyone process the frequent deaths during a pandemic. First, there are the families we care for. Children are losing grandparents with little warning. Parents may be overwhelmed with grief while ill themselves. That makes children vulnerable.
Our medical system in 2 months has moved heaven and earth – and significantly harmed the medical care and financial future of our children – trying to assure that every 80-year-old has the right to die while attached to a ventilator, even though only a small fraction of them will survive to discharge. Meanwhile, on the wards, visitation policies have people deteriorating and dying alone. I find this paradigm distressing and antithetical to my training.
Medicine and nursing both have long histories in which the practitioner recognized that there was little they could do to prevent the death. Their role was to compassionately guide the family through it. For some people, this connection is the most precious of the arts of medicine and nursing. We need to reexamine our values. We need to get creative. We need to involve palliative care experts and clergy with the same urgency with which we have automakers making ventilators.
Second, there are our colleagues. Pediatric caregivers, particularly trainees, rarely encounter deaths and can benefit from debriefing sessions, even short ones. There is comfort in having a colleague review the situation and say: “There was nothing you could have done.” Or even: “That minor omission did not alter the outcome.” Even when everything was done properly, deaths cause moral suffering that needs processing and healing. Even if you don’t have magic words to give, just being present aids in the healing. We are all in this, together.
Dr. Powell is a pediatric hospitalist and clinical ethics consultant living in St. Louis. He has no relevant financial disclosures. Email him at pdnews@mdedge.com.
CLAM trial regimen shown safe, effective for r/r AML
A clofarabine-based treatment was found to be safe and effective in refractory/relapsed acute myeloid leukemia (AML) in the phase 2 CLAM trial.
The CLAM protocol treatment was clofarabine, cytarabine, and mitoxantrone (intravenous infusion, days 1‐5), cytarabine (intravenous infusion starting 4 hours after clofarabine, days 1‐5), and mitoxantrone (intravenous infusion, days 3‐5).
Bone marrow aspiration and trephine biopsy were performed on day 28. A total of 52 patients (16 women), with an age range of 22-65 years and refractory/relapsed AML were treated.
The overall response rate after the first cycle of CLAM was 90.4% (complete remission, 69.2%; CR with incomplete hematologic recovery, 21.2%). In addition, the efficacy of CLAM was not apparently affected by high‐risk karyotypes and genetic mutations among the patients.
Patients with a response (marrow < 5% blasts) received a maximum of two cycles of CLAM consolidation, each at 50% dose reduction, given 6‐8 weeks apart. Responding patients with an HLA‐matched sibling or volunteer‐unrelated donor were offered allogeneic hematopoietic stem cell transplantation (HSCT). Toxicity of CLAM was manageable and did not compromise subsequent allogeneic HSCT, the researchers added.
“In this era of molecular targeting, CLAM might still have a role to play,” according to the researchers. “It offers the advantage of a highly effective regimen that is readily available. It provides a median DOR of 5 months, which is meaningful for organization of HSCT. Delays associated with recruitment into clinical trials or sourcing of targeted drugs are obviated. Precious time is saved, so that patients can quickly be bridged to a potentially curative allogeneic HSCT.”
No disclosures or conflicts of interest were reported.
SOURCE: Gill H et al. Cancer Med. 2020 Mar 20. doi:10.1002/cam4.2865.
A clofarabine-based treatment was found to be safe and effective in refractory/relapsed acute myeloid leukemia (AML) in the phase 2 CLAM trial.
The CLAM protocol treatment was clofarabine, cytarabine, and mitoxantrone (intravenous infusion, days 1‐5), cytarabine (intravenous infusion starting 4 hours after clofarabine, days 1‐5), and mitoxantrone (intravenous infusion, days 3‐5).
Bone marrow aspiration and trephine biopsy were performed on day 28. A total of 52 patients (16 women), with an age range of 22-65 years and refractory/relapsed AML were treated.
The overall response rate after the first cycle of CLAM was 90.4% (complete remission, 69.2%; CR with incomplete hematologic recovery, 21.2%). In addition, the efficacy of CLAM was not apparently affected by high‐risk karyotypes and genetic mutations among the patients.
Patients with a response (marrow < 5% blasts) received a maximum of two cycles of CLAM consolidation, each at 50% dose reduction, given 6‐8 weeks apart. Responding patients with an HLA‐matched sibling or volunteer‐unrelated donor were offered allogeneic hematopoietic stem cell transplantation (HSCT). Toxicity of CLAM was manageable and did not compromise subsequent allogeneic HSCT, the researchers added.
“In this era of molecular targeting, CLAM might still have a role to play,” according to the researchers. “It offers the advantage of a highly effective regimen that is readily available. It provides a median DOR of 5 months, which is meaningful for organization of HSCT. Delays associated with recruitment into clinical trials or sourcing of targeted drugs are obviated. Precious time is saved, so that patients can quickly be bridged to a potentially curative allogeneic HSCT.”
No disclosures or conflicts of interest were reported.
SOURCE: Gill H et al. Cancer Med. 2020 Mar 20. doi:10.1002/cam4.2865.
A clofarabine-based treatment was found to be safe and effective in refractory/relapsed acute myeloid leukemia (AML) in the phase 2 CLAM trial.
The CLAM protocol treatment was clofarabine, cytarabine, and mitoxantrone (intravenous infusion, days 1‐5), cytarabine (intravenous infusion starting 4 hours after clofarabine, days 1‐5), and mitoxantrone (intravenous infusion, days 3‐5).
Bone marrow aspiration and trephine biopsy were performed on day 28. A total of 52 patients (16 women), with an age range of 22-65 years and refractory/relapsed AML were treated.
The overall response rate after the first cycle of CLAM was 90.4% (complete remission, 69.2%; CR with incomplete hematologic recovery, 21.2%). In addition, the efficacy of CLAM was not apparently affected by high‐risk karyotypes and genetic mutations among the patients.
Patients with a response (marrow < 5% blasts) received a maximum of two cycles of CLAM consolidation, each at 50% dose reduction, given 6‐8 weeks apart. Responding patients with an HLA‐matched sibling or volunteer‐unrelated donor were offered allogeneic hematopoietic stem cell transplantation (HSCT). Toxicity of CLAM was manageable and did not compromise subsequent allogeneic HSCT, the researchers added.
“In this era of molecular targeting, CLAM might still have a role to play,” according to the researchers. “It offers the advantage of a highly effective regimen that is readily available. It provides a median DOR of 5 months, which is meaningful for organization of HSCT. Delays associated with recruitment into clinical trials or sourcing of targeted drugs are obviated. Precious time is saved, so that patients can quickly be bridged to a potentially curative allogeneic HSCT.”
No disclosures or conflicts of interest were reported.
SOURCE: Gill H et al. Cancer Med. 2020 Mar 20. doi:10.1002/cam4.2865.
FROM CANCER MEDICINE
Dusky Pink Nodular Plaque on the Finger
The Diagnosis: Majocchi Granuloma
Majocchi granuloma (MG) is a dermatophytic infection that reveals hyphal elements within the cornified cells of follicles and most commonly is caused by Trichophyton rubrum. However, occasionally other Trichophyton, Trichosporon, and Aspergillus species are involved.1
There typically are 2 forms of MG: (1) the small perifollicular papular form that usually is localized to the dermis and occurs in immunocompetent individuals, and (2) a deep form featuring subcutaneous plaques and nodules that generally occur on the hair-bearing surfaces in immunosuppressed hosts.2 Majocchi granuloma also commonly occurs from the use of potent topical steroids on unsuspected tinea.3
Histopathologically, MG generally presents as granulomatous inflammation with perifollicular neutrophilic infiltration. This polymorphonuclear cell infiltrate was visible clinically as a single pustule overlying the nodular plaque, a clue appreciable only on close inspection. Histopathologic examination revealed segmented branching filaments present within cornified elements of a follicle (Figure). Notably, potassium hydroxide (KOH) preparations are unreliable diagnostic aids in MG, as evidenced by the 2 negative KOH preparations in this case. According to Chou and Hsu,4 because KOH preparation can only detect fungi located in the stratum corneum, the result may be negative for MG due to deeper invasion of the fungi into the dermal follicular component. In fact, KOH preparations of MG may reveal no hyphae in 23.3% of cases.2
The initiating factor in MG is not entirely known but is thought to be physical trauma that either directly or indirectly leads to follicle disruption and passive introduction of the organism into the dermis (eg, traumatic implantation via gardening or other recreational activities).2 Other proposed mechanisms include the presentation of the membrane-associated ATP-binding cassette transporter on the surface of T rubrum.1 Dermatophytes evade the host immune system through a variety of mechanisms: (1) cell wall glycoproteins, (2) release of anti-inflammatory cytokines, and (3) generation of immunosuppressive regulatory T cells.1
Collectively, the clinical and histopathologic findings distinguish MG from other cutaneous conditions. Sporotrichosis, a granulomatous infection caused by Sporothrix schenckii, typically is found in tropical regions of the world and often is associated with floriculture.5 Sporotrichosis initially presents in a subcutaneous papulonodular form, but unlike MG, it later ulcerates and progresses along adjacent lymphatic chains.5 Pathology of sporotrichosis exhibits pseudoepitheliomatous hyperplasia with granulomas, possible foci of suppuration, and yeastlike forms called cigar bodies. Chromoblastomycosis clinically is defined by tumorlike lesions on the skin including verrucous, nodular, or scarlike plaques and typically is associated with traumatic injury and implantation of the microorganism. Histologically, chromoblastomycosis demonstrates pseudoepitheliomatous hyperplasia with granulomas and characteristic darkly pigmented, thick-walled sclerotic cells called Medlar bodies.6 Mycobacterium marinum is one cause of nontuberculous mycobacterial skin infections in humans. Clinically, M marinum is associated with improper hygiene techniques and contact with fish tanks and other aqueous environments. Mycobacterium marinum can present histopathologically as early neutrophilic infiltration or late dermal granulomatous inflammation.7 Acid-fast bacilli typically are scant, leaving the diagnosis best secured via polymerase chain reaction assay. Nodular Kaposi sarcoma (KS) can present as a dusky nodular plaque on an acral surface but typically is seen in patients with underlying human immunodeficiency virus/AIDS or other immunosuppressive conditions. The pathology for KS shows a proliferation of human herpes virus 8-positive spindle cells with slitlike spaces containing red blood cells instead of granulomatous inflammation.
Treatment regimens with topical corticosteroids can exacerbate the infection due to local suppression of cell-mediated immunity.8 In these scenarios, fungal infection is suspected, and systemic antifungals such as ketoconazole; itraconazole; or terbinafine, which has become the mainstay, are prescribed. Resolution of the infection with these medications usually is seen after 4 weeks.2
A diagnosis of MG can be elusive and often may take multiple visits. Clinicians should note that MG could demonstrate repeated false-negative KOH preparations; therefore, these tests should not be relied on as the sole determination of a diagnosis. Although chromoblastomycosis, sporotrichosis, nodular KS, and infection with M marinum may all present as nodular plaques with granulomatous pathology, a follicular pustule may be a clinical clue to MG, as its mimics typically lack folliculocentric neutrophils.
- Tirado-Sánchez A, Ponce-Olivera RM, Bonifaz A. Majocchi's granuloma (dermatophytic granuloma): updated therapeutic options. Curr Fungal Infect Rep. 2015;9:204-212.
- Ilkit M, Durdu M, Karakas¸ M. Majocchi's granuloma: a symptom complex caused by fungal pathogens. Med Mycol. 2012;50:449-457.
- Schwartz RA, Janniger CK. Majocchi granuloma. Medscape website. https://emedicine.medscape.com/article/1092601-overview. Updated May 14, 2019. Accessed April 13, 2020.
- Chou WY, Hsu CJ. A case report of Majocchi's granuloma associated with combined therapy of topical steroids and adalimumab. Medicine (Baltimore). 2016;95:E2245.
- Barros MB, de Almeida Paes R, Schubach AO. Sporothrix schenckii and sporotrichosis. Clin Microbiol Rev. 2011;24:633-654.
- Guarner J, Brandt ME. Histopathologic diagnosis of fungal infections in the 21st century. Clin Microbiol Rev. 2011;24:247-280.
- Slany M, Jezek P, Bodnarova M. Fish tank granuloma caused by Mycobacterium marinum in two aquarists: two case reports. Biomed Res Int. 2013;2013:161329.
- Coondoo A, Phiske M, Verma S, et al. Side-effects of topical steroids: a long overdue revisit. Indian Dermatol Online J. 2014;5:416-425.
The Diagnosis: Majocchi Granuloma
Majocchi granuloma (MG) is a dermatophytic infection that reveals hyphal elements within the cornified cells of follicles and most commonly is caused by Trichophyton rubrum. However, occasionally other Trichophyton, Trichosporon, and Aspergillus species are involved.1
There typically are 2 forms of MG: (1) the small perifollicular papular form that usually is localized to the dermis and occurs in immunocompetent individuals, and (2) a deep form featuring subcutaneous plaques and nodules that generally occur on the hair-bearing surfaces in immunosuppressed hosts.2 Majocchi granuloma also commonly occurs from the use of potent topical steroids on unsuspected tinea.3
Histopathologically, MG generally presents as granulomatous inflammation with perifollicular neutrophilic infiltration. This polymorphonuclear cell infiltrate was visible clinically as a single pustule overlying the nodular plaque, a clue appreciable only on close inspection. Histopathologic examination revealed segmented branching filaments present within cornified elements of a follicle (Figure). Notably, potassium hydroxide (KOH) preparations are unreliable diagnostic aids in MG, as evidenced by the 2 negative KOH preparations in this case. According to Chou and Hsu,4 because KOH preparation can only detect fungi located in the stratum corneum, the result may be negative for MG due to deeper invasion of the fungi into the dermal follicular component. In fact, KOH preparations of MG may reveal no hyphae in 23.3% of cases.2
The initiating factor in MG is not entirely known but is thought to be physical trauma that either directly or indirectly leads to follicle disruption and passive introduction of the organism into the dermis (eg, traumatic implantation via gardening or other recreational activities).2 Other proposed mechanisms include the presentation of the membrane-associated ATP-binding cassette transporter on the surface of T rubrum.1 Dermatophytes evade the host immune system through a variety of mechanisms: (1) cell wall glycoproteins, (2) release of anti-inflammatory cytokines, and (3) generation of immunosuppressive regulatory T cells.1
Collectively, the clinical and histopathologic findings distinguish MG from other cutaneous conditions. Sporotrichosis, a granulomatous infection caused by Sporothrix schenckii, typically is found in tropical regions of the world and often is associated with floriculture.5 Sporotrichosis initially presents in a subcutaneous papulonodular form, but unlike MG, it later ulcerates and progresses along adjacent lymphatic chains.5 Pathology of sporotrichosis exhibits pseudoepitheliomatous hyperplasia with granulomas, possible foci of suppuration, and yeastlike forms called cigar bodies. Chromoblastomycosis clinically is defined by tumorlike lesions on the skin including verrucous, nodular, or scarlike plaques and typically is associated with traumatic injury and implantation of the microorganism. Histologically, chromoblastomycosis demonstrates pseudoepitheliomatous hyperplasia with granulomas and characteristic darkly pigmented, thick-walled sclerotic cells called Medlar bodies.6 Mycobacterium marinum is one cause of nontuberculous mycobacterial skin infections in humans. Clinically, M marinum is associated with improper hygiene techniques and contact with fish tanks and other aqueous environments. Mycobacterium marinum can present histopathologically as early neutrophilic infiltration or late dermal granulomatous inflammation.7 Acid-fast bacilli typically are scant, leaving the diagnosis best secured via polymerase chain reaction assay. Nodular Kaposi sarcoma (KS) can present as a dusky nodular plaque on an acral surface but typically is seen in patients with underlying human immunodeficiency virus/AIDS or other immunosuppressive conditions. The pathology for KS shows a proliferation of human herpes virus 8-positive spindle cells with slitlike spaces containing red blood cells instead of granulomatous inflammation.
Treatment regimens with topical corticosteroids can exacerbate the infection due to local suppression of cell-mediated immunity.8 In these scenarios, fungal infection is suspected, and systemic antifungals such as ketoconazole; itraconazole; or terbinafine, which has become the mainstay, are prescribed. Resolution of the infection with these medications usually is seen after 4 weeks.2
A diagnosis of MG can be elusive and often may take multiple visits. Clinicians should note that MG could demonstrate repeated false-negative KOH preparations; therefore, these tests should not be relied on as the sole determination of a diagnosis. Although chromoblastomycosis, sporotrichosis, nodular KS, and infection with M marinum may all present as nodular plaques with granulomatous pathology, a follicular pustule may be a clinical clue to MG, as its mimics typically lack folliculocentric neutrophils.
The Diagnosis: Majocchi Granuloma
Majocchi granuloma (MG) is a dermatophytic infection that reveals hyphal elements within the cornified cells of follicles and most commonly is caused by Trichophyton rubrum. However, occasionally other Trichophyton, Trichosporon, and Aspergillus species are involved.1
There typically are 2 forms of MG: (1) the small perifollicular papular form that usually is localized to the dermis and occurs in immunocompetent individuals, and (2) a deep form featuring subcutaneous plaques and nodules that generally occur on the hair-bearing surfaces in immunosuppressed hosts.2 Majocchi granuloma also commonly occurs from the use of potent topical steroids on unsuspected tinea.3
Histopathologically, MG generally presents as granulomatous inflammation with perifollicular neutrophilic infiltration. This polymorphonuclear cell infiltrate was visible clinically as a single pustule overlying the nodular plaque, a clue appreciable only on close inspection. Histopathologic examination revealed segmented branching filaments present within cornified elements of a follicle (Figure). Notably, potassium hydroxide (KOH) preparations are unreliable diagnostic aids in MG, as evidenced by the 2 negative KOH preparations in this case. According to Chou and Hsu,4 because KOH preparation can only detect fungi located in the stratum corneum, the result may be negative for MG due to deeper invasion of the fungi into the dermal follicular component. In fact, KOH preparations of MG may reveal no hyphae in 23.3% of cases.2
The initiating factor in MG is not entirely known but is thought to be physical trauma that either directly or indirectly leads to follicle disruption and passive introduction of the organism into the dermis (eg, traumatic implantation via gardening or other recreational activities).2 Other proposed mechanisms include the presentation of the membrane-associated ATP-binding cassette transporter on the surface of T rubrum.1 Dermatophytes evade the host immune system through a variety of mechanisms: (1) cell wall glycoproteins, (2) release of anti-inflammatory cytokines, and (3) generation of immunosuppressive regulatory T cells.1
Collectively, the clinical and histopathologic findings distinguish MG from other cutaneous conditions. Sporotrichosis, a granulomatous infection caused by Sporothrix schenckii, typically is found in tropical regions of the world and often is associated with floriculture.5 Sporotrichosis initially presents in a subcutaneous papulonodular form, but unlike MG, it later ulcerates and progresses along adjacent lymphatic chains.5 Pathology of sporotrichosis exhibits pseudoepitheliomatous hyperplasia with granulomas, possible foci of suppuration, and yeastlike forms called cigar bodies. Chromoblastomycosis clinically is defined by tumorlike lesions on the skin including verrucous, nodular, or scarlike plaques and typically is associated with traumatic injury and implantation of the microorganism. Histologically, chromoblastomycosis demonstrates pseudoepitheliomatous hyperplasia with granulomas and characteristic darkly pigmented, thick-walled sclerotic cells called Medlar bodies.6 Mycobacterium marinum is one cause of nontuberculous mycobacterial skin infections in humans. Clinically, M marinum is associated with improper hygiene techniques and contact with fish tanks and other aqueous environments. Mycobacterium marinum can present histopathologically as early neutrophilic infiltration or late dermal granulomatous inflammation.7 Acid-fast bacilli typically are scant, leaving the diagnosis best secured via polymerase chain reaction assay. Nodular Kaposi sarcoma (KS) can present as a dusky nodular plaque on an acral surface but typically is seen in patients with underlying human immunodeficiency virus/AIDS or other immunosuppressive conditions. The pathology for KS shows a proliferation of human herpes virus 8-positive spindle cells with slitlike spaces containing red blood cells instead of granulomatous inflammation.
Treatment regimens with topical corticosteroids can exacerbate the infection due to local suppression of cell-mediated immunity.8 In these scenarios, fungal infection is suspected, and systemic antifungals such as ketoconazole; itraconazole; or terbinafine, which has become the mainstay, are prescribed. Resolution of the infection with these medications usually is seen after 4 weeks.2
A diagnosis of MG can be elusive and often may take multiple visits. Clinicians should note that MG could demonstrate repeated false-negative KOH preparations; therefore, these tests should not be relied on as the sole determination of a diagnosis. Although chromoblastomycosis, sporotrichosis, nodular KS, and infection with M marinum may all present as nodular plaques with granulomatous pathology, a follicular pustule may be a clinical clue to MG, as its mimics typically lack folliculocentric neutrophils.
- Tirado-Sánchez A, Ponce-Olivera RM, Bonifaz A. Majocchi's granuloma (dermatophytic granuloma): updated therapeutic options. Curr Fungal Infect Rep. 2015;9:204-212.
- Ilkit M, Durdu M, Karakas¸ M. Majocchi's granuloma: a symptom complex caused by fungal pathogens. Med Mycol. 2012;50:449-457.
- Schwartz RA, Janniger CK. Majocchi granuloma. Medscape website. https://emedicine.medscape.com/article/1092601-overview. Updated May 14, 2019. Accessed April 13, 2020.
- Chou WY, Hsu CJ. A case report of Majocchi's granuloma associated with combined therapy of topical steroids and adalimumab. Medicine (Baltimore). 2016;95:E2245.
- Barros MB, de Almeida Paes R, Schubach AO. Sporothrix schenckii and sporotrichosis. Clin Microbiol Rev. 2011;24:633-654.
- Guarner J, Brandt ME. Histopathologic diagnosis of fungal infections in the 21st century. Clin Microbiol Rev. 2011;24:247-280.
- Slany M, Jezek P, Bodnarova M. Fish tank granuloma caused by Mycobacterium marinum in two aquarists: two case reports. Biomed Res Int. 2013;2013:161329.
- Coondoo A, Phiske M, Verma S, et al. Side-effects of topical steroids: a long overdue revisit. Indian Dermatol Online J. 2014;5:416-425.
- Tirado-Sánchez A, Ponce-Olivera RM, Bonifaz A. Majocchi's granuloma (dermatophytic granuloma): updated therapeutic options. Curr Fungal Infect Rep. 2015;9:204-212.
- Ilkit M, Durdu M, Karakas¸ M. Majocchi's granuloma: a symptom complex caused by fungal pathogens. Med Mycol. 2012;50:449-457.
- Schwartz RA, Janniger CK. Majocchi granuloma. Medscape website. https://emedicine.medscape.com/article/1092601-overview. Updated May 14, 2019. Accessed April 13, 2020.
- Chou WY, Hsu CJ. A case report of Majocchi's granuloma associated with combined therapy of topical steroids and adalimumab. Medicine (Baltimore). 2016;95:E2245.
- Barros MB, de Almeida Paes R, Schubach AO. Sporothrix schenckii and sporotrichosis. Clin Microbiol Rev. 2011;24:633-654.
- Guarner J, Brandt ME. Histopathologic diagnosis of fungal infections in the 21st century. Clin Microbiol Rev. 2011;24:247-280.
- Slany M, Jezek P, Bodnarova M. Fish tank granuloma caused by Mycobacterium marinum in two aquarists: two case reports. Biomed Res Int. 2013;2013:161329.
- Coondoo A, Phiske M, Verma S, et al. Side-effects of topical steroids: a long overdue revisit. Indian Dermatol Online J. 2014;5:416-425.
A 38-year-old man presented with a persistent pruritic nodular plaque on the proximal right index finger of 4 months' duration. He reported pruning roses in the garden but denied any trauma. The patient previously had been treated by another clinician with fluocinonide cream 0.05%, clobetasol cream 0.05%, intramuscular methylprednisolone 40 mg, and oral doxycycline hyclate 100 mg with no improvement. Two potassium hydroxide preparations were performed as well as a bacterial culture and sensitivity, with all results returning as negative. Physical examination revealed a 2-cm pink to purple, scaly, nodular plaque on the right index finger. A punch biopsy was obtained for histopathology with hematoxylin and eosin stain.
Cancer patients report delays in treatment because of COVID-19
As the COVID-19 pandemic continues, many cancer patients are finding it increasingly difficult to receive the care they need and are facing financial challenges.
Half of the cancer patients and survivors who responded to a recent survey reported changes, delays, or disruptions to the care they were receiving. The survey, with 1,219 respondents, was conducted by the American Cancer Society Cancer Action Network (ACS CAN).
“The circumstances of this virus – from the fact cancer patients are at higher risk of severe complications should they be diagnosed with COVID-19, to the fact many patients are facing serious financial strain caused by the virus’ economic effect – make getting care especially difficult,” Keysha Brooks-Coley, vice president of federal advocacy for ACS CAN, told Medscape Medical News.
Nearly a quarter (24%) of survey respondents reported a delay in care or treatment. The proportion was slightly more (27%) among those currently receiving active treatment.
In addition, 12% (13% in active treatment) stated that not only was their care delayed but that they also have not been told when services would be rescheduled.
As previously reported by Medscape Medical News, many oncology groups have issued new guidelines for cancer care in reaction to the current crisis. These include recommendations to delay cancer treatment in order to avoid exposing cancer patients to the virus.
Half of those in active treatment report disruptions
The survey was initiated by ACS CAN on March 25 and was distributed over a 2-week period. The goal was to gain a better understanding of how COVID-19 was affecting cancer patients and survivors in the United States. Of the 1,219 respondents, half (51%) were cancer patients currently undergoing active treatment.
Among the patients and survivors who were currently in active treatment, 55% reported that there have been changes, delays, or disruptions in their care. The services most frequently affected included in-person provider visits (50%), supportive services (20%), and imaging procedures to monitor tumor growth (20%).
In addition, 8% reported that their treatment, including chemotherapy and immunotherapy, had been affected by the COVID-19 pandemic.
Financial concerns
Almost all of the survey respondents were covered by some type of insurance; 49% had coverage through an employer, 32% were covered by Medicare, 7% had privately purchased insurance, and 4% were covered through Medicaid.
Many cancer patients had already been having difficulty paying for their care, but for a substantial proportion of survey respondents, the COVID-19 pandemic has exacerbated the problem. More than one-third (38%) stated that COVID-19 “has had a notable impact on their financial situation that affects their ability to pay for health care.”
The most common financial problems that were related to access to care include reduced work hours (14%), reduced investment values (11%), having difficulty affording food and supplies because of staying at home to avoid contracting the virus (9%), and becoming unemployed (8%).
A reduction in work hours and job loss were of particular concern to respondents because of the possible effects these would have on their health insurance coverage. Of those who reported that they or a family member living with them had lost a job, 43% had employer-sponsored health insurance. Additionally, 58% of patients or a family member whose working hours had been reduced also had health insurance through their employer
Among the entire cohort, 28% reported that they were worried that the financial impact of COVID-19 would make it difficult to pay for the health care they need as cancer survivors. This concern was highly correlated with income. Almost half (46%) of patients who earned $30,000 or less reported that they were worried, but even in household with incomes over $110,000 per year, 21% were also concerned about the financial impact.
“Now more than ever, patients need to be able to get, keep, and afford health coverage to treat their disease,” commented Brooks-Coley.
Taking action
“ACS CAN is working every day to make clear to Congress and the administration the real and immediate challenges cancer patients and survivors face during this pandemic,” said Brooks-Coley.
With nearly 50 other professional and advocacy groups, ACS CAN has sent letters to congressional leadership and the Secretary of the Department of Health & Human Services asking them to make policy changes that would help patients.
The proposed action points include having insurers allow patients to use providers who are out of network if necessary; waiving site-specific precertification and prior authorization for cancer treatment; utilizing shared decision making between patients and providers in deciding whether to use home infusion without pressure from the insurer; allowing patients to obtain 90-day supplies of medication; increasing funding for state Medicaid programs and assistance for those who have lost employee-sponsored coverage; and improving telehealth services.
“We urge Congress and the administration to keep the needs of cancer patients and survivors in mind as they continue to address the public health crisis,” she said.
This article first appeared on Medscape.com.
As the COVID-19 pandemic continues, many cancer patients are finding it increasingly difficult to receive the care they need and are facing financial challenges.
Half of the cancer patients and survivors who responded to a recent survey reported changes, delays, or disruptions to the care they were receiving. The survey, with 1,219 respondents, was conducted by the American Cancer Society Cancer Action Network (ACS CAN).
“The circumstances of this virus – from the fact cancer patients are at higher risk of severe complications should they be diagnosed with COVID-19, to the fact many patients are facing serious financial strain caused by the virus’ economic effect – make getting care especially difficult,” Keysha Brooks-Coley, vice president of federal advocacy for ACS CAN, told Medscape Medical News.
Nearly a quarter (24%) of survey respondents reported a delay in care or treatment. The proportion was slightly more (27%) among those currently receiving active treatment.
In addition, 12% (13% in active treatment) stated that not only was their care delayed but that they also have not been told when services would be rescheduled.
As previously reported by Medscape Medical News, many oncology groups have issued new guidelines for cancer care in reaction to the current crisis. These include recommendations to delay cancer treatment in order to avoid exposing cancer patients to the virus.
Half of those in active treatment report disruptions
The survey was initiated by ACS CAN on March 25 and was distributed over a 2-week period. The goal was to gain a better understanding of how COVID-19 was affecting cancer patients and survivors in the United States. Of the 1,219 respondents, half (51%) were cancer patients currently undergoing active treatment.
Among the patients and survivors who were currently in active treatment, 55% reported that there have been changes, delays, or disruptions in their care. The services most frequently affected included in-person provider visits (50%), supportive services (20%), and imaging procedures to monitor tumor growth (20%).
In addition, 8% reported that their treatment, including chemotherapy and immunotherapy, had been affected by the COVID-19 pandemic.
Financial concerns
Almost all of the survey respondents were covered by some type of insurance; 49% had coverage through an employer, 32% were covered by Medicare, 7% had privately purchased insurance, and 4% were covered through Medicaid.
Many cancer patients had already been having difficulty paying for their care, but for a substantial proportion of survey respondents, the COVID-19 pandemic has exacerbated the problem. More than one-third (38%) stated that COVID-19 “has had a notable impact on their financial situation that affects their ability to pay for health care.”
The most common financial problems that were related to access to care include reduced work hours (14%), reduced investment values (11%), having difficulty affording food and supplies because of staying at home to avoid contracting the virus (9%), and becoming unemployed (8%).
A reduction in work hours and job loss were of particular concern to respondents because of the possible effects these would have on their health insurance coverage. Of those who reported that they or a family member living with them had lost a job, 43% had employer-sponsored health insurance. Additionally, 58% of patients or a family member whose working hours had been reduced also had health insurance through their employer
Among the entire cohort, 28% reported that they were worried that the financial impact of COVID-19 would make it difficult to pay for the health care they need as cancer survivors. This concern was highly correlated with income. Almost half (46%) of patients who earned $30,000 or less reported that they were worried, but even in household with incomes over $110,000 per year, 21% were also concerned about the financial impact.
“Now more than ever, patients need to be able to get, keep, and afford health coverage to treat their disease,” commented Brooks-Coley.
Taking action
“ACS CAN is working every day to make clear to Congress and the administration the real and immediate challenges cancer patients and survivors face during this pandemic,” said Brooks-Coley.
With nearly 50 other professional and advocacy groups, ACS CAN has sent letters to congressional leadership and the Secretary of the Department of Health & Human Services asking them to make policy changes that would help patients.
The proposed action points include having insurers allow patients to use providers who are out of network if necessary; waiving site-specific precertification and prior authorization for cancer treatment; utilizing shared decision making between patients and providers in deciding whether to use home infusion without pressure from the insurer; allowing patients to obtain 90-day supplies of medication; increasing funding for state Medicaid programs and assistance for those who have lost employee-sponsored coverage; and improving telehealth services.
“We urge Congress and the administration to keep the needs of cancer patients and survivors in mind as they continue to address the public health crisis,” she said.
This article first appeared on Medscape.com.
As the COVID-19 pandemic continues, many cancer patients are finding it increasingly difficult to receive the care they need and are facing financial challenges.
Half of the cancer patients and survivors who responded to a recent survey reported changes, delays, or disruptions to the care they were receiving. The survey, with 1,219 respondents, was conducted by the American Cancer Society Cancer Action Network (ACS CAN).
“The circumstances of this virus – from the fact cancer patients are at higher risk of severe complications should they be diagnosed with COVID-19, to the fact many patients are facing serious financial strain caused by the virus’ economic effect – make getting care especially difficult,” Keysha Brooks-Coley, vice president of federal advocacy for ACS CAN, told Medscape Medical News.
Nearly a quarter (24%) of survey respondents reported a delay in care or treatment. The proportion was slightly more (27%) among those currently receiving active treatment.
In addition, 12% (13% in active treatment) stated that not only was their care delayed but that they also have not been told when services would be rescheduled.
As previously reported by Medscape Medical News, many oncology groups have issued new guidelines for cancer care in reaction to the current crisis. These include recommendations to delay cancer treatment in order to avoid exposing cancer patients to the virus.
Half of those in active treatment report disruptions
The survey was initiated by ACS CAN on March 25 and was distributed over a 2-week period. The goal was to gain a better understanding of how COVID-19 was affecting cancer patients and survivors in the United States. Of the 1,219 respondents, half (51%) were cancer patients currently undergoing active treatment.
Among the patients and survivors who were currently in active treatment, 55% reported that there have been changes, delays, or disruptions in their care. The services most frequently affected included in-person provider visits (50%), supportive services (20%), and imaging procedures to monitor tumor growth (20%).
In addition, 8% reported that their treatment, including chemotherapy and immunotherapy, had been affected by the COVID-19 pandemic.
Financial concerns
Almost all of the survey respondents were covered by some type of insurance; 49% had coverage through an employer, 32% were covered by Medicare, 7% had privately purchased insurance, and 4% were covered through Medicaid.
Many cancer patients had already been having difficulty paying for their care, but for a substantial proportion of survey respondents, the COVID-19 pandemic has exacerbated the problem. More than one-third (38%) stated that COVID-19 “has had a notable impact on their financial situation that affects their ability to pay for health care.”
The most common financial problems that were related to access to care include reduced work hours (14%), reduced investment values (11%), having difficulty affording food and supplies because of staying at home to avoid contracting the virus (9%), and becoming unemployed (8%).
A reduction in work hours and job loss were of particular concern to respondents because of the possible effects these would have on their health insurance coverage. Of those who reported that they or a family member living with them had lost a job, 43% had employer-sponsored health insurance. Additionally, 58% of patients or a family member whose working hours had been reduced also had health insurance through their employer
Among the entire cohort, 28% reported that they were worried that the financial impact of COVID-19 would make it difficult to pay for the health care they need as cancer survivors. This concern was highly correlated with income. Almost half (46%) of patients who earned $30,000 or less reported that they were worried, but even in household with incomes over $110,000 per year, 21% were also concerned about the financial impact.
“Now more than ever, patients need to be able to get, keep, and afford health coverage to treat their disease,” commented Brooks-Coley.
Taking action
“ACS CAN is working every day to make clear to Congress and the administration the real and immediate challenges cancer patients and survivors face during this pandemic,” said Brooks-Coley.
With nearly 50 other professional and advocacy groups, ACS CAN has sent letters to congressional leadership and the Secretary of the Department of Health & Human Services asking them to make policy changes that would help patients.
The proposed action points include having insurers allow patients to use providers who are out of network if necessary; waiving site-specific precertification and prior authorization for cancer treatment; utilizing shared decision making between patients and providers in deciding whether to use home infusion without pressure from the insurer; allowing patients to obtain 90-day supplies of medication; increasing funding for state Medicaid programs and assistance for those who have lost employee-sponsored coverage; and improving telehealth services.
“We urge Congress and the administration to keep the needs of cancer patients and survivors in mind as they continue to address the public health crisis,” she said.
This article first appeared on Medscape.com.
The DNA Mismatch Repair System in Sebaceous Tumors: An Update on the Genetics and Workup of Muir-Torre Syndrome
It is well known by now that tumor formation is driven by accumulation of numerous genetic and epigenetic mutations. Human cells are equipped with an apparatus called the DNA mismatch repair (MMR) system that corrects errors during replication.1 If these genes are themselves mutated, cells then start accumulating mutations in other genes, including oncogenes and tumor suppressor genes, which results in the development of sustained proliferative signaling pathways, evasion of growth suppression, resistance to cell death, and the potential for invasion and metastasis.2
Gene mutations in DNA MMR have been detected in several tumors, such as sebaceous tumors,3 colorectal adenocarcinomas,4 keratoacanthomas,5 and other visceral malignancies.6 Sebaceous tumors are rare in the general population; however, they are common in patients with inherited or acquired mutations in MMR genes.5 These patients also have been found to have other visceral malignancies such as colorectal adenocarcinomas and breast, lung, and central nervous system (CNS) tumors.7 This observation was made in the 1960s, and patients were referred to as having Muir-Torre syndrome (MTS).8 This article serves to briefly describe the DNA MMR system and its implication in sebaceous tumors as well as discuss the recent recommendations for screening for MTS in patients presenting with sebaceous tumors.
The DNA MMR System
Mismatch repair proteins are responsible for detecting and repairing errors during cell division, especially in microsatellite regions.9 Microsatellites are common and widely distributed DNA motifs consisting of repeated nucleotide sequences that normally account for 3% of the genome.10 Mutations in MMR result in insertion or deletion of nucleotides in these DNA motifs, making them either abnormally long or short, referred to as microsatellite instability (MSI), which results in downstream cumulative accumulation of mutations in oncogenes and tumor suppressor genes, and thus carcinogenesis.9
There are 7 human MMR proteins: MLH1, MLH3, MSH2, MSH3, MSH6, PMS1, and PMS2. These proteins are highly conserved across different living species.11 Loss of MMR proteins can be due to a mutation in the coding sequence of the gene or due to epigenetic hypermethylation of the gene promoter.12 These alterations can be inherited or acquired and in most cases result in MSI.
When assessing for MSI, tumor genomes can be divided into 3 subtypes: high-level and low-level MSI and stable microsatellites.13 Tumors with high-level MSI respond better to treatment and show a better prognosis than those with low-level MSI or stable microsatellites,14 which is thought to be due to tumor-induced immune activation. Microsatellite instability results in the generation of frameshift peptides that are immunogenic and induce tumor-specific immune responses.15 Several research laboratories have artificially synthesized frameshift peptides as vaccines and have successfully used them as targets for immune therapy as a way for preventing and treating malignancies.16
Sebaceous Tumors in MTS
A typical example of tumors that arise from mutations in the DNA MMR system is seen in MTS,a rare inherited genetic syndrome that predisposes patients to sebaceous neoplasms, keratoacanthomas, and visceral malignancies.17 It was first described as an autosomal-dominant condition in patients who have at least 1 sebaceous tumor and 1 visceral malignancy, with or without keratoacanthomas. It was then later characterized as a skin variant of Lynch syndrome, also known as hereditary nonpolyposis colorectal cancer syndrome.18
Sebaceous tumors are the hallmark of MTS. Although sebaceous hyperplasia is common in the general population, sebaceous tumors are rare outside the context of MTS. There are 3 types of sebaceous tumors with distinct pathologic features: adenoma, epithelioma, and carcinoma.19 Sebaceous adenomas and epitheliomas are benign growths; however, sebaceous carcinomas can be aggressive and have metastatic potential.20 Because it is difficult to clinically distinguish carcinomas from the benign sebaceous growths, biopsy of a large, changing, or ulcerated lesion is important in these patients to rule out a sebaceous carcinoma. Other aggressive skin tumors can develop in MTS, such as rapidly growing keratoacanthomas and basal cell carcinomas with sebaceous differentiation.21
Types of MTS
For most cases, MTS is characterized by germline mutations in DNA MMR genes. The most common mutation involves MSH2 (MutS Homolog 2)—found in approximately 90% of patients—followed by MLH1 (MutL Homolog 1)—found in approximately 10% of patients.22 Other MMR genes such as MSH6 (MutS Homolog 6), PMS2 (PMS1 homolog 2, mismatch repair system component), and MLH3 (MutL Homolog 3) less commonly are reported in MTS. There is a subset of patients who lose MSH2 or MLH1 expression due to promoter hypermethylation rather than a germline mutation. Methylation results in biallelic inactivation of the gene and loss of expression.23
A new subtype of MTS has been identified that demonstrates an autosomal-recessive pattern of inheritance and is referred to as MTS type 2 (autosomal-recessive colorectal adenomatous polyposis).24 In contrast to the classic MTS type 1, MTS type 2 exhibits microsatellite stability. Recent molecular analyses revealed that type 2 is due to a mutation in a base excision repair gene called MUTYH (mutY DNA glycosylase).25 These patients are likely to develop hundreds of polyps at an early age.
Muir-Torre syndrome also can occur sporadically without inheriting a germline mutation, which has been reported in a transplant patient from de novo somatic mutations or promoter hypermethylation.26 A case report of a renal transplant patient showed that switching from tacrolimus to sirolimus halted the appearance of new sebaceous neoplasms, which suggests that patients with MTS who undergo organ transplantation should potentially avoid tacrolimus and be put on sirolimus instead.27
Visceral Malignancies in MTS
Apart from frequent skin examinations, MTS patients should have frequent and rigorous visceral malignancy screening. Patients most commonly develop colorectal adenocarcinoma, especially in the proximal parts of the colon.28 In addition, they can develop numerous premalignant tumors, especially in MTS type 2. Other common tumors include endometrial, ovarian, genitourinary, hepatobiliary, breast, lung, hematopoietic, and CNS malignancies.29
Studies showed that specific loss of certain MMR proteins predispose patients to different types of visceral malignancies.30-32 For example, loss of MSH2 predisposes patients to development of extracolonic tumors, while loss of MLH1 more strongly is associated with development of colorectal adenocarcinoma.30 Patients with MSH2 also are at risk for development of CNS tumors, while patients with MLH1 mutations have never been reported to develop CNS tumors.31 Patients with loss of PMS2 have the lowest risk for development of any visceral malignancy.32
Diagnosing MTS
Let us consider a scenario whereby a dermatologist biopsied a solitary lesion and it came back as a sebaceous tumor. What would be the next step to establish a diagnosis of MTS?
Sebaceous tumors are rare outside the context of MTS. Therefore, patients presenting with a solitary sebaceous tumor should be worked up for MTS, as there are implications for further cancer screening. One helpful clue that can affect the pretest probability for MTS diagnosis is location of the tumor. A sebaceous tumor inferior to the neck most likely is associated with MTS. On the other hand, tumors on the head and neck can be spontaneous or associated with MTS.33 Another helpful tool is the Mayo score, a risk score for MTS in patients with sebaceous tumors.34 The score is established by adding up points, with 1 point given to each of the following: age of onset of a sebaceous tumor less than 60 years, personal history of visceral malignancy, and family history of Lynch syndrome–related visceral malignancy. Two points are given if the patient has 2 or more sebaceous tumors. The score ranges from 0 to 5. A risk score of 2 or more has a sensitivity of 100% and specificity of 81% for predicting a germline mutation in MMR genes.34
Testing for loss of MMR proteins is performed using immunohistochemistry (IHC) as well as microsatellite gene analysis on the biopsied tumor. There is no need to perform another biopsy, as these tests can be performed on the paraffin-embedded formalin fixed tissue. Immunohistochemistry testing looks for loss of expression of one of the MMR proteins. Staining usually is performed for MSH2, MSH6, and MLH1, as the combination offers a sensitivity of 81% and a positive predictive value of 100%.23,35,36
If IHC shows loss of MMR proteins, then MSI gene analysis should be performed as a confirmatory test by using MSI gene locus assays, which utilize 5 markers of mononucleotide and dinucleotide repeats. If the genome is positive for 2 of 5 of these markers, then the patient most likely has MTS.13
One caveat for IHC analysis is that there is a subset of patients who develop a solitary sebaceous tumor due to a sporadic loss of MMR protein without having MTS. These tumors also exhibit BRAF (B-Raf proto-oncogene, serine/threonine kinase) mutations or loss of p16, features that distinguish these tumors from those developed in MTS.37 As such, in a patient with a low Mayo score who developed a solitary sebaceous tumor that showed loss of MMR protein on IHC without evidence of MSI, it is reasonable to perform IHC for BRAF and p16 to avoid inaccurate diagnosis of MTS.
Another caveat is that standard MSI analysis will not detect MSI in tumors with loss of MSH6 because the markers used in the MSI analysis do not detect MSI caused by MSH6 loss. For these patients, MSI analysis using a panel composed of mononucleotides alone (pentaplex assay) should be performed in lieu of the standard panel.38
It is important to note that these molecular tests are not helpful for patients with MTS type 2, as the sebaceous tumors maintain MMR proteins and have microsatellite stability. As such, if MTS is highly suspected based on the Mayo score (either personal history of malignancy or strong family history) but the IHC and MSI analysis are negative, then referral to a geneticist for identification for MUTYH gene mutation is a reasonable next step. These patients with high Mayo scores should still be managed as MTS patients and should be screened for visceral malignancies despite lack of confirmatory tests.
Final Thoughts
Dermatologists should be highly suspicious of MTS when they diagnose sebaceous tumors. Making a diagnosis of MTS notably affects patients’ primary care. Patients with MTS should have annual skin examinations, neurologic examinations, colonoscopies starting at the age of 18 years, and surveillance for breast and pelvic cancers in women (by annual transvaginal ultrasound and endometrial aspirations) or for prostate and testicular cancers in men.17,39,40 Other tests to be ordered annually include complete blood cell count with differential and urinalysis.19
- Yamamoto H, Imai K. An updated review of microsatellite instability in the era of next-generation sequencing and precision medicine. Semin Oncol. 2019;46:261-270.
- Tamura K, Kaneda M, Futagawa M, et al. Genetic and genomic basis of the mismatch repair system involved in Lynch syndrome. Int J Clin Oncol. 2019;24:999-1011.
- Shiki M, Hida T, Sugano K, et al. Muir-Torre syndrome caused by exonic deletion of MLH1 due to homologous recombination. Eur J Dermatol. 2017;27:54-58.
- Büttner R, Friedrichs N. Hereditary colon cancer in Lynch syndrome/HNPCC syndrome in Germany. Pathologe. 2019;40:584-591.
- Kuwabara K, Suzuki O, Chika N, et al. Prevalence and molecular characteristics of DNA mismatch repair protein-deficient sebaceous neoplasms and keratoacanthomas in a Japanese hospital-based population. Jpn J Clin Oncol. 2018;48:514-521.
- Burris CKH, Rodriguez ME, Raven ML, et al. Muir-torre syndrome: the importance of a detailed family history. Case Rep Ophthalmol. 2019;10:180-185.
- Walsh MD, Jayasekara H, Huang A, et al. Clinico-pathological predictors of mismatch repair deficiency in sebaceous neoplasia: a large case series from a single Australian private pathology service. Australas J Dermatol. 2019;60:126-133.
- Georgeson P, Walsh MD, Clendenning M, et al. Tumor mutational signatures in sebaceous skin lesions from individuals with Lynch syndrome. Mol Genet Genomic Med. 2019;7:E00781.
- Hsieh P, Yamane K. DNA mismatch repair: molecular mechanism, cancer, and ageing. Mech Ageing Dev. 2008;129:391-407.
- Li YC, Korol AB, Fahima T, et al. Microsatellites within genes: structure, function, and evolution [published online February 12, 2004]. Mol Biol Evol. 2004;21:991-1007.
- Ellegren H. Microsatellites: simple sequences with complex evolution. Nat Rev Genet. 2004;5:435-445.
- Everett JN, Raymond VM, Dandapani M, et al. Screening for germline mismatch repair mutations following diagnosis of sebaceous neoplasm. JAMA Dermatol. 2014;150:1315-1321.
- Nojadeh JN, Sharif SB, Sakhinia E. Microsatellite instability in colorectal cancer. EXCLI J. 2018;17:159-168.
- Yang G, Zheng RY, Jin ZS. Correlations between microsatellite instability and the biological behaviour of tumours. J Cancer Res Clin Oncol. 2019;145:2891-2899.
- Garbe Y, Maletzki C, Linnebacher M. An MSI tumor specific frameshift mutation in a coding microsatellite of MSH3 encodes for HLA-A0201-restricted CD8+ cytotoxic T cell epitopes. PLoS One. 2011;6:E26517.
- Peng M, Mo Y, Wang Y, et al. Neoantigen vaccine: an emerging tumor immunotherapy. Mol Cancer. 2019;18:128.
- Rubay D, Ohanisian L, Bank MP, et al. Muir-Torre syndrome, a rare phenotype of hereditary nonpolyposis colorectal cancer with cutaneous manifestations. ACG Case Reports J. 2019;6:E00188.
- Velter C, Caussade P, Fricker JP, et al. Muir-Torre syndrome and Turcot syndrome [in French]. Ann Dermatol Venereol. 2017;144:525-529.
- John AM, Schwartz RA. Muir-Torre syndrome (MTS): an update and approach to diagnosis and management. J Am Acad Dermatol. 2016;74:558-566.
- Kibbi N, Worley B, Owen JL, et al. Sebaceous carcinoma: controversies and their evidence for clinical practice. Arch Dermatol Res. 2020;312:25-31.
- Marcoval J, Talavera-Belmonte A, Fornons-Servent R, et al. Cutaneous sebaceous tumours and Lynch syndrome: long-term follow-up of 60 patients. Clin Exp Dermatol. 2019;44:506-511.
- Roth RM, Haraldsdottir S, Hampel H, et al. Discordant mismatch repair protein immunoreactivity in Lynch syndrome-associated neoplasms: a recommendation for screening synchronous/metachronous neoplasms. Am J Clin Pathol. 2016;146:50-56.
- Westwood A, Glover A, Hutchins G, et al. Additional loss of MSH2 and MSH6 expression in sporadic deficient mismatch repair colorectal cancer due to MLH1 promoter hypermethylation. J Clin Pathol. 2019;72:443-447.
- Claes K, Dahan K, Tejpar S, et al. The genetics of familial adenomatous polyposis (FAP) and MutYH-associated polyposis (MAP). Acta Gastroenterol Belg. 2011;74:421-426.
- Sampson JR, Dolwani S, Jones S, et al. Autosomal recessive colorectal adenomatous polyposis due to inherited mutations of MYH. Lancet. 2003;362:39-41.
- Tomonari M, Shimada M, Nakada Y, et al. Muir-Torre syndrome: sebaceous carcinoma concurrent with colon cancer in a kidney transplant recipient; a case report. BMC Nephrol. 2019;20:394
- Levi Z, Hazazi R, Kedar-Barnes I, et al. Switching from tacrolimus to sirolimus halts the appearance of new sebaceous neoplasms in Muir-Torre syndrome. Am J Transplant. 2007;7:476-479.
- Mork ME, Rodriguez A, Taggart MW, et al. Identification of MSH2 inversion of exons 1–7 in clinical evaluation of families with suspected Lynch syndrome. Fam Cancer. 2017;16:357-361.
- Schwartz RA, Torre DP. The Muir-Torre syndrome: a 25-year retrospect. J Am Acad Dermatol. 1995;33:90-104.
- Chen W, Swanson BJ, Frankel WL. Molecular genetics of microsatellite-unstable colorectal cancer for pathologists. Diagn Pathol. 2017;12:24.
- Bansidhar BJ. Extracolonic manifestations of Lynch syndrome. Clin Colon Rectal Surg. 2012;25:103-110.
- Kato A, Sato N, Sugawara T, et al. Isolated loss of PMS2 immunohistochemical expression is frequently caused by heterogenous MLH1 promoter hypermethylation in Lynch syndrome screening for endometrial cancer patients. Am J Surg Pathol. 2016;40:770-776.
- Singh RS, Grayson W, Redston M, et al. Site and tumor type predicts DNA mismatch repair status in cutaneous sebaceous neoplasia. Am J Surg Pathol. 2008;32:936-942.
- Roberts ME, Riegert-Johnson DL, Thomas BC, et al. A clinical scoring system to identify patients with sebaceous neoplasms at risk for the Muir-Torre variant of Lynch syndrome [published online March 6, 2014]. Genet Med. 2014;16:711-716.
- Chhibber V, Dresser K, Mahalingam M. MSH-6: extending the reliability of immunohistochemistry as a screening tool in Muir-Torre syndrome. Mod Pathol. 2008;21:159-164.
- Orta L, Klimstra DS, Qin J, et al. Towards identification of hereditary DNA mismatch repair deficiency: sebaceous neoplasm warrants routine immunohistochemical screening regardless of patient’s age or other clinical characteristics. Am J Surg Pathol. 2009;33:934-944.
- Mathiak M, Rütten A, Mangold E, et al. Loss of DNA mismatch repair proteins in skin tumors from patients with Muir-Torre syndrome and MSH2 or MLH1 germline mutations: establishment of immunohistochemical analysis as a screening test. Am J Surg Pathol. 2002;26:338-343.
- Campanella NC, Berardinelli GN, Scapulatempo-Neto C, et al. Optimization of a pentaplex panel for MSI analysis without control DNA in a Brazilian population: correlation with ancestry markers. Eur J Hum Genet. 2014;22:875-880.
- Ponti G, Manfredini M, Tomasi A, et al. Muir-Torre Syndrome and founder mismatch repair gene mutations: a long gone historical genetic challenge. Gene. 2016;589:127-132.
- Ferreira I, Wiedemeyer K, Demetter P, et al. Update on the pathology, genetics and somatic landscape of sebaceous tumours [published online December 10, 2019]. Histopathology. doi:10.1111/his.14044
It is well known by now that tumor formation is driven by accumulation of numerous genetic and epigenetic mutations. Human cells are equipped with an apparatus called the DNA mismatch repair (MMR) system that corrects errors during replication.1 If these genes are themselves mutated, cells then start accumulating mutations in other genes, including oncogenes and tumor suppressor genes, which results in the development of sustained proliferative signaling pathways, evasion of growth suppression, resistance to cell death, and the potential for invasion and metastasis.2
Gene mutations in DNA MMR have been detected in several tumors, such as sebaceous tumors,3 colorectal adenocarcinomas,4 keratoacanthomas,5 and other visceral malignancies.6 Sebaceous tumors are rare in the general population; however, they are common in patients with inherited or acquired mutations in MMR genes.5 These patients also have been found to have other visceral malignancies such as colorectal adenocarcinomas and breast, lung, and central nervous system (CNS) tumors.7 This observation was made in the 1960s, and patients were referred to as having Muir-Torre syndrome (MTS).8 This article serves to briefly describe the DNA MMR system and its implication in sebaceous tumors as well as discuss the recent recommendations for screening for MTS in patients presenting with sebaceous tumors.
The DNA MMR System
Mismatch repair proteins are responsible for detecting and repairing errors during cell division, especially in microsatellite regions.9 Microsatellites are common and widely distributed DNA motifs consisting of repeated nucleotide sequences that normally account for 3% of the genome.10 Mutations in MMR result in insertion or deletion of nucleotides in these DNA motifs, making them either abnormally long or short, referred to as microsatellite instability (MSI), which results in downstream cumulative accumulation of mutations in oncogenes and tumor suppressor genes, and thus carcinogenesis.9
There are 7 human MMR proteins: MLH1, MLH3, MSH2, MSH3, MSH6, PMS1, and PMS2. These proteins are highly conserved across different living species.11 Loss of MMR proteins can be due to a mutation in the coding sequence of the gene or due to epigenetic hypermethylation of the gene promoter.12 These alterations can be inherited or acquired and in most cases result in MSI.
When assessing for MSI, tumor genomes can be divided into 3 subtypes: high-level and low-level MSI and stable microsatellites.13 Tumors with high-level MSI respond better to treatment and show a better prognosis than those with low-level MSI or stable microsatellites,14 which is thought to be due to tumor-induced immune activation. Microsatellite instability results in the generation of frameshift peptides that are immunogenic and induce tumor-specific immune responses.15 Several research laboratories have artificially synthesized frameshift peptides as vaccines and have successfully used them as targets for immune therapy as a way for preventing and treating malignancies.16
Sebaceous Tumors in MTS
A typical example of tumors that arise from mutations in the DNA MMR system is seen in MTS,a rare inherited genetic syndrome that predisposes patients to sebaceous neoplasms, keratoacanthomas, and visceral malignancies.17 It was first described as an autosomal-dominant condition in patients who have at least 1 sebaceous tumor and 1 visceral malignancy, with or without keratoacanthomas. It was then later characterized as a skin variant of Lynch syndrome, also known as hereditary nonpolyposis colorectal cancer syndrome.18
Sebaceous tumors are the hallmark of MTS. Although sebaceous hyperplasia is common in the general population, sebaceous tumors are rare outside the context of MTS. There are 3 types of sebaceous tumors with distinct pathologic features: adenoma, epithelioma, and carcinoma.19 Sebaceous adenomas and epitheliomas are benign growths; however, sebaceous carcinomas can be aggressive and have metastatic potential.20 Because it is difficult to clinically distinguish carcinomas from the benign sebaceous growths, biopsy of a large, changing, or ulcerated lesion is important in these patients to rule out a sebaceous carcinoma. Other aggressive skin tumors can develop in MTS, such as rapidly growing keratoacanthomas and basal cell carcinomas with sebaceous differentiation.21
Types of MTS
For most cases, MTS is characterized by germline mutations in DNA MMR genes. The most common mutation involves MSH2 (MutS Homolog 2)—found in approximately 90% of patients—followed by MLH1 (MutL Homolog 1)—found in approximately 10% of patients.22 Other MMR genes such as MSH6 (MutS Homolog 6), PMS2 (PMS1 homolog 2, mismatch repair system component), and MLH3 (MutL Homolog 3) less commonly are reported in MTS. There is a subset of patients who lose MSH2 or MLH1 expression due to promoter hypermethylation rather than a germline mutation. Methylation results in biallelic inactivation of the gene and loss of expression.23
A new subtype of MTS has been identified that demonstrates an autosomal-recessive pattern of inheritance and is referred to as MTS type 2 (autosomal-recessive colorectal adenomatous polyposis).24 In contrast to the classic MTS type 1, MTS type 2 exhibits microsatellite stability. Recent molecular analyses revealed that type 2 is due to a mutation in a base excision repair gene called MUTYH (mutY DNA glycosylase).25 These patients are likely to develop hundreds of polyps at an early age.
Muir-Torre syndrome also can occur sporadically without inheriting a germline mutation, which has been reported in a transplant patient from de novo somatic mutations or promoter hypermethylation.26 A case report of a renal transplant patient showed that switching from tacrolimus to sirolimus halted the appearance of new sebaceous neoplasms, which suggests that patients with MTS who undergo organ transplantation should potentially avoid tacrolimus and be put on sirolimus instead.27
Visceral Malignancies in MTS
Apart from frequent skin examinations, MTS patients should have frequent and rigorous visceral malignancy screening. Patients most commonly develop colorectal adenocarcinoma, especially in the proximal parts of the colon.28 In addition, they can develop numerous premalignant tumors, especially in MTS type 2. Other common tumors include endometrial, ovarian, genitourinary, hepatobiliary, breast, lung, hematopoietic, and CNS malignancies.29
Studies showed that specific loss of certain MMR proteins predispose patients to different types of visceral malignancies.30-32 For example, loss of MSH2 predisposes patients to development of extracolonic tumors, while loss of MLH1 more strongly is associated with development of colorectal adenocarcinoma.30 Patients with MSH2 also are at risk for development of CNS tumors, while patients with MLH1 mutations have never been reported to develop CNS tumors.31 Patients with loss of PMS2 have the lowest risk for development of any visceral malignancy.32
Diagnosing MTS
Let us consider a scenario whereby a dermatologist biopsied a solitary lesion and it came back as a sebaceous tumor. What would be the next step to establish a diagnosis of MTS?
Sebaceous tumors are rare outside the context of MTS. Therefore, patients presenting with a solitary sebaceous tumor should be worked up for MTS, as there are implications for further cancer screening. One helpful clue that can affect the pretest probability for MTS diagnosis is location of the tumor. A sebaceous tumor inferior to the neck most likely is associated with MTS. On the other hand, tumors on the head and neck can be spontaneous or associated with MTS.33 Another helpful tool is the Mayo score, a risk score for MTS in patients with sebaceous tumors.34 The score is established by adding up points, with 1 point given to each of the following: age of onset of a sebaceous tumor less than 60 years, personal history of visceral malignancy, and family history of Lynch syndrome–related visceral malignancy. Two points are given if the patient has 2 or more sebaceous tumors. The score ranges from 0 to 5. A risk score of 2 or more has a sensitivity of 100% and specificity of 81% for predicting a germline mutation in MMR genes.34
Testing for loss of MMR proteins is performed using immunohistochemistry (IHC) as well as microsatellite gene analysis on the biopsied tumor. There is no need to perform another biopsy, as these tests can be performed on the paraffin-embedded formalin fixed tissue. Immunohistochemistry testing looks for loss of expression of one of the MMR proteins. Staining usually is performed for MSH2, MSH6, and MLH1, as the combination offers a sensitivity of 81% and a positive predictive value of 100%.23,35,36
If IHC shows loss of MMR proteins, then MSI gene analysis should be performed as a confirmatory test by using MSI gene locus assays, which utilize 5 markers of mononucleotide and dinucleotide repeats. If the genome is positive for 2 of 5 of these markers, then the patient most likely has MTS.13
One caveat for IHC analysis is that there is a subset of patients who develop a solitary sebaceous tumor due to a sporadic loss of MMR protein without having MTS. These tumors also exhibit BRAF (B-Raf proto-oncogene, serine/threonine kinase) mutations or loss of p16, features that distinguish these tumors from those developed in MTS.37 As such, in a patient with a low Mayo score who developed a solitary sebaceous tumor that showed loss of MMR protein on IHC without evidence of MSI, it is reasonable to perform IHC for BRAF and p16 to avoid inaccurate diagnosis of MTS.
Another caveat is that standard MSI analysis will not detect MSI in tumors with loss of MSH6 because the markers used in the MSI analysis do not detect MSI caused by MSH6 loss. For these patients, MSI analysis using a panel composed of mononucleotides alone (pentaplex assay) should be performed in lieu of the standard panel.38
It is important to note that these molecular tests are not helpful for patients with MTS type 2, as the sebaceous tumors maintain MMR proteins and have microsatellite stability. As such, if MTS is highly suspected based on the Mayo score (either personal history of malignancy or strong family history) but the IHC and MSI analysis are negative, then referral to a geneticist for identification for MUTYH gene mutation is a reasonable next step. These patients with high Mayo scores should still be managed as MTS patients and should be screened for visceral malignancies despite lack of confirmatory tests.
Final Thoughts
Dermatologists should be highly suspicious of MTS when they diagnose sebaceous tumors. Making a diagnosis of MTS notably affects patients’ primary care. Patients with MTS should have annual skin examinations, neurologic examinations, colonoscopies starting at the age of 18 years, and surveillance for breast and pelvic cancers in women (by annual transvaginal ultrasound and endometrial aspirations) or for prostate and testicular cancers in men.17,39,40 Other tests to be ordered annually include complete blood cell count with differential and urinalysis.19
It is well known by now that tumor formation is driven by accumulation of numerous genetic and epigenetic mutations. Human cells are equipped with an apparatus called the DNA mismatch repair (MMR) system that corrects errors during replication.1 If these genes are themselves mutated, cells then start accumulating mutations in other genes, including oncogenes and tumor suppressor genes, which results in the development of sustained proliferative signaling pathways, evasion of growth suppression, resistance to cell death, and the potential for invasion and metastasis.2
Gene mutations in DNA MMR have been detected in several tumors, such as sebaceous tumors,3 colorectal adenocarcinomas,4 keratoacanthomas,5 and other visceral malignancies.6 Sebaceous tumors are rare in the general population; however, they are common in patients with inherited or acquired mutations in MMR genes.5 These patients also have been found to have other visceral malignancies such as colorectal adenocarcinomas and breast, lung, and central nervous system (CNS) tumors.7 This observation was made in the 1960s, and patients were referred to as having Muir-Torre syndrome (MTS).8 This article serves to briefly describe the DNA MMR system and its implication in sebaceous tumors as well as discuss the recent recommendations for screening for MTS in patients presenting with sebaceous tumors.
The DNA MMR System
Mismatch repair proteins are responsible for detecting and repairing errors during cell division, especially in microsatellite regions.9 Microsatellites are common and widely distributed DNA motifs consisting of repeated nucleotide sequences that normally account for 3% of the genome.10 Mutations in MMR result in insertion or deletion of nucleotides in these DNA motifs, making them either abnormally long or short, referred to as microsatellite instability (MSI), which results in downstream cumulative accumulation of mutations in oncogenes and tumor suppressor genes, and thus carcinogenesis.9
There are 7 human MMR proteins: MLH1, MLH3, MSH2, MSH3, MSH6, PMS1, and PMS2. These proteins are highly conserved across different living species.11 Loss of MMR proteins can be due to a mutation in the coding sequence of the gene or due to epigenetic hypermethylation of the gene promoter.12 These alterations can be inherited or acquired and in most cases result in MSI.
When assessing for MSI, tumor genomes can be divided into 3 subtypes: high-level and low-level MSI and stable microsatellites.13 Tumors with high-level MSI respond better to treatment and show a better prognosis than those with low-level MSI or stable microsatellites,14 which is thought to be due to tumor-induced immune activation. Microsatellite instability results in the generation of frameshift peptides that are immunogenic and induce tumor-specific immune responses.15 Several research laboratories have artificially synthesized frameshift peptides as vaccines and have successfully used them as targets for immune therapy as a way for preventing and treating malignancies.16
Sebaceous Tumors in MTS
A typical example of tumors that arise from mutations in the DNA MMR system is seen in MTS,a rare inherited genetic syndrome that predisposes patients to sebaceous neoplasms, keratoacanthomas, and visceral malignancies.17 It was first described as an autosomal-dominant condition in patients who have at least 1 sebaceous tumor and 1 visceral malignancy, with or without keratoacanthomas. It was then later characterized as a skin variant of Lynch syndrome, also known as hereditary nonpolyposis colorectal cancer syndrome.18
Sebaceous tumors are the hallmark of MTS. Although sebaceous hyperplasia is common in the general population, sebaceous tumors are rare outside the context of MTS. There are 3 types of sebaceous tumors with distinct pathologic features: adenoma, epithelioma, and carcinoma.19 Sebaceous adenomas and epitheliomas are benign growths; however, sebaceous carcinomas can be aggressive and have metastatic potential.20 Because it is difficult to clinically distinguish carcinomas from the benign sebaceous growths, biopsy of a large, changing, or ulcerated lesion is important in these patients to rule out a sebaceous carcinoma. Other aggressive skin tumors can develop in MTS, such as rapidly growing keratoacanthomas and basal cell carcinomas with sebaceous differentiation.21
Types of MTS
For most cases, MTS is characterized by germline mutations in DNA MMR genes. The most common mutation involves MSH2 (MutS Homolog 2)—found in approximately 90% of patients—followed by MLH1 (MutL Homolog 1)—found in approximately 10% of patients.22 Other MMR genes such as MSH6 (MutS Homolog 6), PMS2 (PMS1 homolog 2, mismatch repair system component), and MLH3 (MutL Homolog 3) less commonly are reported in MTS. There is a subset of patients who lose MSH2 or MLH1 expression due to promoter hypermethylation rather than a germline mutation. Methylation results in biallelic inactivation of the gene and loss of expression.23
A new subtype of MTS has been identified that demonstrates an autosomal-recessive pattern of inheritance and is referred to as MTS type 2 (autosomal-recessive colorectal adenomatous polyposis).24 In contrast to the classic MTS type 1, MTS type 2 exhibits microsatellite stability. Recent molecular analyses revealed that type 2 is due to a mutation in a base excision repair gene called MUTYH (mutY DNA glycosylase).25 These patients are likely to develop hundreds of polyps at an early age.
Muir-Torre syndrome also can occur sporadically without inheriting a germline mutation, which has been reported in a transplant patient from de novo somatic mutations or promoter hypermethylation.26 A case report of a renal transplant patient showed that switching from tacrolimus to sirolimus halted the appearance of new sebaceous neoplasms, which suggests that patients with MTS who undergo organ transplantation should potentially avoid tacrolimus and be put on sirolimus instead.27
Visceral Malignancies in MTS
Apart from frequent skin examinations, MTS patients should have frequent and rigorous visceral malignancy screening. Patients most commonly develop colorectal adenocarcinoma, especially in the proximal parts of the colon.28 In addition, they can develop numerous premalignant tumors, especially in MTS type 2. Other common tumors include endometrial, ovarian, genitourinary, hepatobiliary, breast, lung, hematopoietic, and CNS malignancies.29
Studies showed that specific loss of certain MMR proteins predispose patients to different types of visceral malignancies.30-32 For example, loss of MSH2 predisposes patients to development of extracolonic tumors, while loss of MLH1 more strongly is associated with development of colorectal adenocarcinoma.30 Patients with MSH2 also are at risk for development of CNS tumors, while patients with MLH1 mutations have never been reported to develop CNS tumors.31 Patients with loss of PMS2 have the lowest risk for development of any visceral malignancy.32
Diagnosing MTS
Let us consider a scenario whereby a dermatologist biopsied a solitary lesion and it came back as a sebaceous tumor. What would be the next step to establish a diagnosis of MTS?
Sebaceous tumors are rare outside the context of MTS. Therefore, patients presenting with a solitary sebaceous tumor should be worked up for MTS, as there are implications for further cancer screening. One helpful clue that can affect the pretest probability for MTS diagnosis is location of the tumor. A sebaceous tumor inferior to the neck most likely is associated with MTS. On the other hand, tumors on the head and neck can be spontaneous or associated with MTS.33 Another helpful tool is the Mayo score, a risk score for MTS in patients with sebaceous tumors.34 The score is established by adding up points, with 1 point given to each of the following: age of onset of a sebaceous tumor less than 60 years, personal history of visceral malignancy, and family history of Lynch syndrome–related visceral malignancy. Two points are given if the patient has 2 or more sebaceous tumors. The score ranges from 0 to 5. A risk score of 2 or more has a sensitivity of 100% and specificity of 81% for predicting a germline mutation in MMR genes.34
Testing for loss of MMR proteins is performed using immunohistochemistry (IHC) as well as microsatellite gene analysis on the biopsied tumor. There is no need to perform another biopsy, as these tests can be performed on the paraffin-embedded formalin fixed tissue. Immunohistochemistry testing looks for loss of expression of one of the MMR proteins. Staining usually is performed for MSH2, MSH6, and MLH1, as the combination offers a sensitivity of 81% and a positive predictive value of 100%.23,35,36
If IHC shows loss of MMR proteins, then MSI gene analysis should be performed as a confirmatory test by using MSI gene locus assays, which utilize 5 markers of mononucleotide and dinucleotide repeats. If the genome is positive for 2 of 5 of these markers, then the patient most likely has MTS.13
One caveat for IHC analysis is that there is a subset of patients who develop a solitary sebaceous tumor due to a sporadic loss of MMR protein without having MTS. These tumors also exhibit BRAF (B-Raf proto-oncogene, serine/threonine kinase) mutations or loss of p16, features that distinguish these tumors from those developed in MTS.37 As such, in a patient with a low Mayo score who developed a solitary sebaceous tumor that showed loss of MMR protein on IHC without evidence of MSI, it is reasonable to perform IHC for BRAF and p16 to avoid inaccurate diagnosis of MTS.
Another caveat is that standard MSI analysis will not detect MSI in tumors with loss of MSH6 because the markers used in the MSI analysis do not detect MSI caused by MSH6 loss. For these patients, MSI analysis using a panel composed of mononucleotides alone (pentaplex assay) should be performed in lieu of the standard panel.38
It is important to note that these molecular tests are not helpful for patients with MTS type 2, as the sebaceous tumors maintain MMR proteins and have microsatellite stability. As such, if MTS is highly suspected based on the Mayo score (either personal history of malignancy or strong family history) but the IHC and MSI analysis are negative, then referral to a geneticist for identification for MUTYH gene mutation is a reasonable next step. These patients with high Mayo scores should still be managed as MTS patients and should be screened for visceral malignancies despite lack of confirmatory tests.
Final Thoughts
Dermatologists should be highly suspicious of MTS when they diagnose sebaceous tumors. Making a diagnosis of MTS notably affects patients’ primary care. Patients with MTS should have annual skin examinations, neurologic examinations, colonoscopies starting at the age of 18 years, and surveillance for breast and pelvic cancers in women (by annual transvaginal ultrasound and endometrial aspirations) or for prostate and testicular cancers in men.17,39,40 Other tests to be ordered annually include complete blood cell count with differential and urinalysis.19
- Yamamoto H, Imai K. An updated review of microsatellite instability in the era of next-generation sequencing and precision medicine. Semin Oncol. 2019;46:261-270.
- Tamura K, Kaneda M, Futagawa M, et al. Genetic and genomic basis of the mismatch repair system involved in Lynch syndrome. Int J Clin Oncol. 2019;24:999-1011.
- Shiki M, Hida T, Sugano K, et al. Muir-Torre syndrome caused by exonic deletion of MLH1 due to homologous recombination. Eur J Dermatol. 2017;27:54-58.
- Büttner R, Friedrichs N. Hereditary colon cancer in Lynch syndrome/HNPCC syndrome in Germany. Pathologe. 2019;40:584-591.
- Kuwabara K, Suzuki O, Chika N, et al. Prevalence and molecular characteristics of DNA mismatch repair protein-deficient sebaceous neoplasms and keratoacanthomas in a Japanese hospital-based population. Jpn J Clin Oncol. 2018;48:514-521.
- Burris CKH, Rodriguez ME, Raven ML, et al. Muir-torre syndrome: the importance of a detailed family history. Case Rep Ophthalmol. 2019;10:180-185.
- Walsh MD, Jayasekara H, Huang A, et al. Clinico-pathological predictors of mismatch repair deficiency in sebaceous neoplasia: a large case series from a single Australian private pathology service. Australas J Dermatol. 2019;60:126-133.
- Georgeson P, Walsh MD, Clendenning M, et al. Tumor mutational signatures in sebaceous skin lesions from individuals with Lynch syndrome. Mol Genet Genomic Med. 2019;7:E00781.
- Hsieh P, Yamane K. DNA mismatch repair: molecular mechanism, cancer, and ageing. Mech Ageing Dev. 2008;129:391-407.
- Li YC, Korol AB, Fahima T, et al. Microsatellites within genes: structure, function, and evolution [published online February 12, 2004]. Mol Biol Evol. 2004;21:991-1007.
- Ellegren H. Microsatellites: simple sequences with complex evolution. Nat Rev Genet. 2004;5:435-445.
- Everett JN, Raymond VM, Dandapani M, et al. Screening for germline mismatch repair mutations following diagnosis of sebaceous neoplasm. JAMA Dermatol. 2014;150:1315-1321.
- Nojadeh JN, Sharif SB, Sakhinia E. Microsatellite instability in colorectal cancer. EXCLI J. 2018;17:159-168.
- Yang G, Zheng RY, Jin ZS. Correlations between microsatellite instability and the biological behaviour of tumours. J Cancer Res Clin Oncol. 2019;145:2891-2899.
- Garbe Y, Maletzki C, Linnebacher M. An MSI tumor specific frameshift mutation in a coding microsatellite of MSH3 encodes for HLA-A0201-restricted CD8+ cytotoxic T cell epitopes. PLoS One. 2011;6:E26517.
- Peng M, Mo Y, Wang Y, et al. Neoantigen vaccine: an emerging tumor immunotherapy. Mol Cancer. 2019;18:128.
- Rubay D, Ohanisian L, Bank MP, et al. Muir-Torre syndrome, a rare phenotype of hereditary nonpolyposis colorectal cancer with cutaneous manifestations. ACG Case Reports J. 2019;6:E00188.
- Velter C, Caussade P, Fricker JP, et al. Muir-Torre syndrome and Turcot syndrome [in French]. Ann Dermatol Venereol. 2017;144:525-529.
- John AM, Schwartz RA. Muir-Torre syndrome (MTS): an update and approach to diagnosis and management. J Am Acad Dermatol. 2016;74:558-566.
- Kibbi N, Worley B, Owen JL, et al. Sebaceous carcinoma: controversies and their evidence for clinical practice. Arch Dermatol Res. 2020;312:25-31.
- Marcoval J, Talavera-Belmonte A, Fornons-Servent R, et al. Cutaneous sebaceous tumours and Lynch syndrome: long-term follow-up of 60 patients. Clin Exp Dermatol. 2019;44:506-511.
- Roth RM, Haraldsdottir S, Hampel H, et al. Discordant mismatch repair protein immunoreactivity in Lynch syndrome-associated neoplasms: a recommendation for screening synchronous/metachronous neoplasms. Am J Clin Pathol. 2016;146:50-56.
- Westwood A, Glover A, Hutchins G, et al. Additional loss of MSH2 and MSH6 expression in sporadic deficient mismatch repair colorectal cancer due to MLH1 promoter hypermethylation. J Clin Pathol. 2019;72:443-447.
- Claes K, Dahan K, Tejpar S, et al. The genetics of familial adenomatous polyposis (FAP) and MutYH-associated polyposis (MAP). Acta Gastroenterol Belg. 2011;74:421-426.
- Sampson JR, Dolwani S, Jones S, et al. Autosomal recessive colorectal adenomatous polyposis due to inherited mutations of MYH. Lancet. 2003;362:39-41.
- Tomonari M, Shimada M, Nakada Y, et al. Muir-Torre syndrome: sebaceous carcinoma concurrent with colon cancer in a kidney transplant recipient; a case report. BMC Nephrol. 2019;20:394
- Levi Z, Hazazi R, Kedar-Barnes I, et al. Switching from tacrolimus to sirolimus halts the appearance of new sebaceous neoplasms in Muir-Torre syndrome. Am J Transplant. 2007;7:476-479.
- Mork ME, Rodriguez A, Taggart MW, et al. Identification of MSH2 inversion of exons 1–7 in clinical evaluation of families with suspected Lynch syndrome. Fam Cancer. 2017;16:357-361.
- Schwartz RA, Torre DP. The Muir-Torre syndrome: a 25-year retrospect. J Am Acad Dermatol. 1995;33:90-104.
- Chen W, Swanson BJ, Frankel WL. Molecular genetics of microsatellite-unstable colorectal cancer for pathologists. Diagn Pathol. 2017;12:24.
- Bansidhar BJ. Extracolonic manifestations of Lynch syndrome. Clin Colon Rectal Surg. 2012;25:103-110.
- Kato A, Sato N, Sugawara T, et al. Isolated loss of PMS2 immunohistochemical expression is frequently caused by heterogenous MLH1 promoter hypermethylation in Lynch syndrome screening for endometrial cancer patients. Am J Surg Pathol. 2016;40:770-776.
- Singh RS, Grayson W, Redston M, et al. Site and tumor type predicts DNA mismatch repair status in cutaneous sebaceous neoplasia. Am J Surg Pathol. 2008;32:936-942.
- Roberts ME, Riegert-Johnson DL, Thomas BC, et al. A clinical scoring system to identify patients with sebaceous neoplasms at risk for the Muir-Torre variant of Lynch syndrome [published online March 6, 2014]. Genet Med. 2014;16:711-716.
- Chhibber V, Dresser K, Mahalingam M. MSH-6: extending the reliability of immunohistochemistry as a screening tool in Muir-Torre syndrome. Mod Pathol. 2008;21:159-164.
- Orta L, Klimstra DS, Qin J, et al. Towards identification of hereditary DNA mismatch repair deficiency: sebaceous neoplasm warrants routine immunohistochemical screening regardless of patient’s age or other clinical characteristics. Am J Surg Pathol. 2009;33:934-944.
- Mathiak M, Rütten A, Mangold E, et al. Loss of DNA mismatch repair proteins in skin tumors from patients with Muir-Torre syndrome and MSH2 or MLH1 germline mutations: establishment of immunohistochemical analysis as a screening test. Am J Surg Pathol. 2002;26:338-343.
- Campanella NC, Berardinelli GN, Scapulatempo-Neto C, et al. Optimization of a pentaplex panel for MSI analysis without control DNA in a Brazilian population: correlation with ancestry markers. Eur J Hum Genet. 2014;22:875-880.
- Ponti G, Manfredini M, Tomasi A, et al. Muir-Torre Syndrome and founder mismatch repair gene mutations: a long gone historical genetic challenge. Gene. 2016;589:127-132.
- Ferreira I, Wiedemeyer K, Demetter P, et al. Update on the pathology, genetics and somatic landscape of sebaceous tumours [published online December 10, 2019]. Histopathology. doi:10.1111/his.14044
- Yamamoto H, Imai K. An updated review of microsatellite instability in the era of next-generation sequencing and precision medicine. Semin Oncol. 2019;46:261-270.
- Tamura K, Kaneda M, Futagawa M, et al. Genetic and genomic basis of the mismatch repair system involved in Lynch syndrome. Int J Clin Oncol. 2019;24:999-1011.
- Shiki M, Hida T, Sugano K, et al. Muir-Torre syndrome caused by exonic deletion of MLH1 due to homologous recombination. Eur J Dermatol. 2017;27:54-58.
- Büttner R, Friedrichs N. Hereditary colon cancer in Lynch syndrome/HNPCC syndrome in Germany. Pathologe. 2019;40:584-591.
- Kuwabara K, Suzuki O, Chika N, et al. Prevalence and molecular characteristics of DNA mismatch repair protein-deficient sebaceous neoplasms and keratoacanthomas in a Japanese hospital-based population. Jpn J Clin Oncol. 2018;48:514-521.
- Burris CKH, Rodriguez ME, Raven ML, et al. Muir-torre syndrome: the importance of a detailed family history. Case Rep Ophthalmol. 2019;10:180-185.
- Walsh MD, Jayasekara H, Huang A, et al. Clinico-pathological predictors of mismatch repair deficiency in sebaceous neoplasia: a large case series from a single Australian private pathology service. Australas J Dermatol. 2019;60:126-133.
- Georgeson P, Walsh MD, Clendenning M, et al. Tumor mutational signatures in sebaceous skin lesions from individuals with Lynch syndrome. Mol Genet Genomic Med. 2019;7:E00781.
- Hsieh P, Yamane K. DNA mismatch repair: molecular mechanism, cancer, and ageing. Mech Ageing Dev. 2008;129:391-407.
- Li YC, Korol AB, Fahima T, et al. Microsatellites within genes: structure, function, and evolution [published online February 12, 2004]. Mol Biol Evol. 2004;21:991-1007.
- Ellegren H. Microsatellites: simple sequences with complex evolution. Nat Rev Genet. 2004;5:435-445.
- Everett JN, Raymond VM, Dandapani M, et al. Screening for germline mismatch repair mutations following diagnosis of sebaceous neoplasm. JAMA Dermatol. 2014;150:1315-1321.
- Nojadeh JN, Sharif SB, Sakhinia E. Microsatellite instability in colorectal cancer. EXCLI J. 2018;17:159-168.
- Yang G, Zheng RY, Jin ZS. Correlations between microsatellite instability and the biological behaviour of tumours. J Cancer Res Clin Oncol. 2019;145:2891-2899.
- Garbe Y, Maletzki C, Linnebacher M. An MSI tumor specific frameshift mutation in a coding microsatellite of MSH3 encodes for HLA-A0201-restricted CD8+ cytotoxic T cell epitopes. PLoS One. 2011;6:E26517.
- Peng M, Mo Y, Wang Y, et al. Neoantigen vaccine: an emerging tumor immunotherapy. Mol Cancer. 2019;18:128.
- Rubay D, Ohanisian L, Bank MP, et al. Muir-Torre syndrome, a rare phenotype of hereditary nonpolyposis colorectal cancer with cutaneous manifestations. ACG Case Reports J. 2019;6:E00188.
- Velter C, Caussade P, Fricker JP, et al. Muir-Torre syndrome and Turcot syndrome [in French]. Ann Dermatol Venereol. 2017;144:525-529.
- John AM, Schwartz RA. Muir-Torre syndrome (MTS): an update and approach to diagnosis and management. J Am Acad Dermatol. 2016;74:558-566.
- Kibbi N, Worley B, Owen JL, et al. Sebaceous carcinoma: controversies and their evidence for clinical practice. Arch Dermatol Res. 2020;312:25-31.
- Marcoval J, Talavera-Belmonte A, Fornons-Servent R, et al. Cutaneous sebaceous tumours and Lynch syndrome: long-term follow-up of 60 patients. Clin Exp Dermatol. 2019;44:506-511.
- Roth RM, Haraldsdottir S, Hampel H, et al. Discordant mismatch repair protein immunoreactivity in Lynch syndrome-associated neoplasms: a recommendation for screening synchronous/metachronous neoplasms. Am J Clin Pathol. 2016;146:50-56.
- Westwood A, Glover A, Hutchins G, et al. Additional loss of MSH2 and MSH6 expression in sporadic deficient mismatch repair colorectal cancer due to MLH1 promoter hypermethylation. J Clin Pathol. 2019;72:443-447.
- Claes K, Dahan K, Tejpar S, et al. The genetics of familial adenomatous polyposis (FAP) and MutYH-associated polyposis (MAP). Acta Gastroenterol Belg. 2011;74:421-426.
- Sampson JR, Dolwani S, Jones S, et al. Autosomal recessive colorectal adenomatous polyposis due to inherited mutations of MYH. Lancet. 2003;362:39-41.
- Tomonari M, Shimada M, Nakada Y, et al. Muir-Torre syndrome: sebaceous carcinoma concurrent with colon cancer in a kidney transplant recipient; a case report. BMC Nephrol. 2019;20:394
- Levi Z, Hazazi R, Kedar-Barnes I, et al. Switching from tacrolimus to sirolimus halts the appearance of new sebaceous neoplasms in Muir-Torre syndrome. Am J Transplant. 2007;7:476-479.
- Mork ME, Rodriguez A, Taggart MW, et al. Identification of MSH2 inversion of exons 1–7 in clinical evaluation of families with suspected Lynch syndrome. Fam Cancer. 2017;16:357-361.
- Schwartz RA, Torre DP. The Muir-Torre syndrome: a 25-year retrospect. J Am Acad Dermatol. 1995;33:90-104.
- Chen W, Swanson BJ, Frankel WL. Molecular genetics of microsatellite-unstable colorectal cancer for pathologists. Diagn Pathol. 2017;12:24.
- Bansidhar BJ. Extracolonic manifestations of Lynch syndrome. Clin Colon Rectal Surg. 2012;25:103-110.
- Kato A, Sato N, Sugawara T, et al. Isolated loss of PMS2 immunohistochemical expression is frequently caused by heterogenous MLH1 promoter hypermethylation in Lynch syndrome screening for endometrial cancer patients. Am J Surg Pathol. 2016;40:770-776.
- Singh RS, Grayson W, Redston M, et al. Site and tumor type predicts DNA mismatch repair status in cutaneous sebaceous neoplasia. Am J Surg Pathol. 2008;32:936-942.
- Roberts ME, Riegert-Johnson DL, Thomas BC, et al. A clinical scoring system to identify patients with sebaceous neoplasms at risk for the Muir-Torre variant of Lynch syndrome [published online March 6, 2014]. Genet Med. 2014;16:711-716.
- Chhibber V, Dresser K, Mahalingam M. MSH-6: extending the reliability of immunohistochemistry as a screening tool in Muir-Torre syndrome. Mod Pathol. 2008;21:159-164.
- Orta L, Klimstra DS, Qin J, et al. Towards identification of hereditary DNA mismatch repair deficiency: sebaceous neoplasm warrants routine immunohistochemical screening regardless of patient’s age or other clinical characteristics. Am J Surg Pathol. 2009;33:934-944.
- Mathiak M, Rütten A, Mangold E, et al. Loss of DNA mismatch repair proteins in skin tumors from patients with Muir-Torre syndrome and MSH2 or MLH1 germline mutations: establishment of immunohistochemical analysis as a screening test. Am J Surg Pathol. 2002;26:338-343.
- Campanella NC, Berardinelli GN, Scapulatempo-Neto C, et al. Optimization of a pentaplex panel for MSI analysis without control DNA in a Brazilian population: correlation with ancestry markers. Eur J Hum Genet. 2014;22:875-880.
- Ponti G, Manfredini M, Tomasi A, et al. Muir-Torre Syndrome and founder mismatch repair gene mutations: a long gone historical genetic challenge. Gene. 2016;589:127-132.
- Ferreira I, Wiedemeyer K, Demetter P, et al. Update on the pathology, genetics and somatic landscape of sebaceous tumours [published online December 10, 2019]. Histopathology. doi:10.1111/his.14044
Resident Pearls
- When patients present with a solitary sebaceous tumor, there is a high likelihood they have Muir-Torre syndrome (MTS) and thus are at a high risk to develop visceral malignancies.
- It is important to perform further testing using immunohistochemistry for DNA mismatch repair proteins and microsatellite instability gene analysis in some cases to confirm the diagnosis of MTS and to perform the appropriate cancer screening tests.
Update confirms survival benefit with trastuzumab in uterine serous carcinoma
Adding trastuzumab to carboplatin/paclitaxel improved survival in patients with advanced or recurrent HER2/Neu-positive uterine serous carcinoma (USC), according to an updated analysis from a phase 2 trial.
At a median follow-up of 25.9 months, the median progression-free survival (PFS) was 12.9 months in patients who received trastuzumab plus carboplatin/paclitaxel and 8.0 months in patients who received only carboplatin/paclitaxel. The median overall survival (OS) was 29.6 months and 24.4 months, respectively.
Amanda Nickles Fader, MD, of Johns Hopkins Medicine, Baltimore, and colleagues reported these findings in an abstract that was slated for presentation at the Society of Gynecologic Oncology’s Annual Meeting on Women’s Cancer. The meeting was canceled because of the COVID-19 pandemic.
Confirmed benefit
The phase 2 trial was designed to assess whether trastuzumab, a humanized monoclonal antibody that targets HER2/neu – a growth factor receptor found in almost all USC cases and overexpressed in 30% of cases – would improve survival in patients with USC, Dr. Nickles Fader explained in an interview. She noted that trastuzumab has been shown to provide benefit in breast cancer patients with HER2/neu overexpression.
“[U]terine serous carcinoma ... is a very aggressive high-grade endometrial cancer subtype that is associated with really poor clinical outcomes and significant mortality,” Dr. Nickles Fader said. “It represents fewer than 10% of all uterine cancer cases, but it actually accounts for a disproportionate 40% of all deaths from uterine cancer.”
The overall survival among USC patients is about 45%, compared with 91% for more common lower-grade types of uterine cancers, she added.
“The conventional treatments for uterine serous carcinoma include surgery and then chemotherapy, but we’ve only really gotten so far by using a sort of one-size-fits-all treatment philosophy,” Dr. Nickles Fader said.
Based on preliminary findings from the current trial (J Clin Oncol. 2018 Jul 10;36[20]:2044-51), trastuzumab plus carboplatin/paclitaxel is now recognized as an alternative standard in treating advanced or recurrent HER2/Neu-positive USC, and this updated analysis confirms the benefits of adding trastuzumab, she said.
PFS, OS, and toxicity
There were 58 evaluable patients with primary stage III-IV or recurrent USC who were randomized to receive six cycles of carboplatin/paclitaxel alone or in combination with intravenous trastuzumab given until toxicity or progression.
The median PFS at a median follow-up of 25.9 months “very significantly favored” the trastuzumab arm, Dr. Nickles Fader said. The median PFS was 12.9 months in the trastuzumab arm and 8.0 months in the carboplatin/paclitaxel arm (hazard ratio, 0.46; P = .005).
In the 41 patients undergoing primary treatment, the median PFS was 17.7 months in the trastuzumab arm and 9.3 months in the control arm (HR, 0.44; P = .015). In the 17 patients with recurrent disease, the median PFS was 9.2 months and 7.0 months, respectively (HR, 0.12; P = .004).
“We were very pleased to see that there was also an overall survival benefit of about 5 months in the trastuzumab arm, compared to the control arm,” Dr. Nickles Fader said. The median OS was 29.6 months and 24.4 months, respectively (HR, 0.58; P = .046).
The PFS and OS benefit was “particularly striking” in the stage III-IV patients, according to Dr. Nickles Fader and colleagues. In this subgroup, the median OS was not reached in the trastuzumab arm, and it was 25.4 months in the control arm (HR, 0.49; P = .041).
Long-term toxicity did not differ between the treatment arms.
Applications and next steps
“The take-home message here is women should be tested if they have this subtype,” Dr. Nickles Fader said. “If they’re newly diagnosed, they should be tested for the HER2/neu receptor, and if [it is overexpressed] and they have advanced disease, we do recommend treatment with not only the conventional treatment, but with trastuzumab added to that, because that’s where we saw the most benefit.”
This is the only trial that has ever shown a major PFS and OS difference with combination targeted therapy and conventional chemotherapy in USC, Dr. Nickles Fader noted.
“So it was really exciting to see that,” she said, adding that a “much larger cooperative group trial” is being designed by the National Cancer Institute and NRG Oncology Group to look at this approach in HER2-positive, advanced-stage uterine cancers. The trial will include patients with USC, but it will extend to other uterine cancer types as well.
“We’re looking at different combinations of anti-HER2 therapies to sort of validate the results of this trial, but also to study this in other tumors that are HER2 positive,” Dr. Nickles Fader explained.
She also stressed the importance of addressing racial disparities in survival among women with USC, as African American women have higher rates of USC and related mortality than do other groups.
“It’s going to be important to look at not only molecular targets and improving survival but also racial inequalities and potentially epigenetics to really improve survival across the board,” Dr. Nickles Fader said.
She reported having no disclosures. The trial was sponsored by Yale University in collaboration with Genentech.
SOURCE: Nickles Fader A et al. SGO 2020, Abstract 12.
Adding trastuzumab to carboplatin/paclitaxel improved survival in patients with advanced or recurrent HER2/Neu-positive uterine serous carcinoma (USC), according to an updated analysis from a phase 2 trial.
At a median follow-up of 25.9 months, the median progression-free survival (PFS) was 12.9 months in patients who received trastuzumab plus carboplatin/paclitaxel and 8.0 months in patients who received only carboplatin/paclitaxel. The median overall survival (OS) was 29.6 months and 24.4 months, respectively.
Amanda Nickles Fader, MD, of Johns Hopkins Medicine, Baltimore, and colleagues reported these findings in an abstract that was slated for presentation at the Society of Gynecologic Oncology’s Annual Meeting on Women’s Cancer. The meeting was canceled because of the COVID-19 pandemic.
Confirmed benefit
The phase 2 trial was designed to assess whether trastuzumab, a humanized monoclonal antibody that targets HER2/neu – a growth factor receptor found in almost all USC cases and overexpressed in 30% of cases – would improve survival in patients with USC, Dr. Nickles Fader explained in an interview. She noted that trastuzumab has been shown to provide benefit in breast cancer patients with HER2/neu overexpression.
“[U]terine serous carcinoma ... is a very aggressive high-grade endometrial cancer subtype that is associated with really poor clinical outcomes and significant mortality,” Dr. Nickles Fader said. “It represents fewer than 10% of all uterine cancer cases, but it actually accounts for a disproportionate 40% of all deaths from uterine cancer.”
The overall survival among USC patients is about 45%, compared with 91% for more common lower-grade types of uterine cancers, she added.
“The conventional treatments for uterine serous carcinoma include surgery and then chemotherapy, but we’ve only really gotten so far by using a sort of one-size-fits-all treatment philosophy,” Dr. Nickles Fader said.
Based on preliminary findings from the current trial (J Clin Oncol. 2018 Jul 10;36[20]:2044-51), trastuzumab plus carboplatin/paclitaxel is now recognized as an alternative standard in treating advanced or recurrent HER2/Neu-positive USC, and this updated analysis confirms the benefits of adding trastuzumab, she said.
PFS, OS, and toxicity
There were 58 evaluable patients with primary stage III-IV or recurrent USC who were randomized to receive six cycles of carboplatin/paclitaxel alone or in combination with intravenous trastuzumab given until toxicity or progression.
The median PFS at a median follow-up of 25.9 months “very significantly favored” the trastuzumab arm, Dr. Nickles Fader said. The median PFS was 12.9 months in the trastuzumab arm and 8.0 months in the carboplatin/paclitaxel arm (hazard ratio, 0.46; P = .005).
In the 41 patients undergoing primary treatment, the median PFS was 17.7 months in the trastuzumab arm and 9.3 months in the control arm (HR, 0.44; P = .015). In the 17 patients with recurrent disease, the median PFS was 9.2 months and 7.0 months, respectively (HR, 0.12; P = .004).
“We were very pleased to see that there was also an overall survival benefit of about 5 months in the trastuzumab arm, compared to the control arm,” Dr. Nickles Fader said. The median OS was 29.6 months and 24.4 months, respectively (HR, 0.58; P = .046).
The PFS and OS benefit was “particularly striking” in the stage III-IV patients, according to Dr. Nickles Fader and colleagues. In this subgroup, the median OS was not reached in the trastuzumab arm, and it was 25.4 months in the control arm (HR, 0.49; P = .041).
Long-term toxicity did not differ between the treatment arms.
Applications and next steps
“The take-home message here is women should be tested if they have this subtype,” Dr. Nickles Fader said. “If they’re newly diagnosed, they should be tested for the HER2/neu receptor, and if [it is overexpressed] and they have advanced disease, we do recommend treatment with not only the conventional treatment, but with trastuzumab added to that, because that’s where we saw the most benefit.”
This is the only trial that has ever shown a major PFS and OS difference with combination targeted therapy and conventional chemotherapy in USC, Dr. Nickles Fader noted.
“So it was really exciting to see that,” she said, adding that a “much larger cooperative group trial” is being designed by the National Cancer Institute and NRG Oncology Group to look at this approach in HER2-positive, advanced-stage uterine cancers. The trial will include patients with USC, but it will extend to other uterine cancer types as well.
“We’re looking at different combinations of anti-HER2 therapies to sort of validate the results of this trial, but also to study this in other tumors that are HER2 positive,” Dr. Nickles Fader explained.
She also stressed the importance of addressing racial disparities in survival among women with USC, as African American women have higher rates of USC and related mortality than do other groups.
“It’s going to be important to look at not only molecular targets and improving survival but also racial inequalities and potentially epigenetics to really improve survival across the board,” Dr. Nickles Fader said.
She reported having no disclosures. The trial was sponsored by Yale University in collaboration with Genentech.
SOURCE: Nickles Fader A et al. SGO 2020, Abstract 12.
Adding trastuzumab to carboplatin/paclitaxel improved survival in patients with advanced or recurrent HER2/Neu-positive uterine serous carcinoma (USC), according to an updated analysis from a phase 2 trial.
At a median follow-up of 25.9 months, the median progression-free survival (PFS) was 12.9 months in patients who received trastuzumab plus carboplatin/paclitaxel and 8.0 months in patients who received only carboplatin/paclitaxel. The median overall survival (OS) was 29.6 months and 24.4 months, respectively.
Amanda Nickles Fader, MD, of Johns Hopkins Medicine, Baltimore, and colleagues reported these findings in an abstract that was slated for presentation at the Society of Gynecologic Oncology’s Annual Meeting on Women’s Cancer. The meeting was canceled because of the COVID-19 pandemic.
Confirmed benefit
The phase 2 trial was designed to assess whether trastuzumab, a humanized monoclonal antibody that targets HER2/neu – a growth factor receptor found in almost all USC cases and overexpressed in 30% of cases – would improve survival in patients with USC, Dr. Nickles Fader explained in an interview. She noted that trastuzumab has been shown to provide benefit in breast cancer patients with HER2/neu overexpression.
“[U]terine serous carcinoma ... is a very aggressive high-grade endometrial cancer subtype that is associated with really poor clinical outcomes and significant mortality,” Dr. Nickles Fader said. “It represents fewer than 10% of all uterine cancer cases, but it actually accounts for a disproportionate 40% of all deaths from uterine cancer.”
The overall survival among USC patients is about 45%, compared with 91% for more common lower-grade types of uterine cancers, she added.
“The conventional treatments for uterine serous carcinoma include surgery and then chemotherapy, but we’ve only really gotten so far by using a sort of one-size-fits-all treatment philosophy,” Dr. Nickles Fader said.
Based on preliminary findings from the current trial (J Clin Oncol. 2018 Jul 10;36[20]:2044-51), trastuzumab plus carboplatin/paclitaxel is now recognized as an alternative standard in treating advanced or recurrent HER2/Neu-positive USC, and this updated analysis confirms the benefits of adding trastuzumab, she said.
PFS, OS, and toxicity
There were 58 evaluable patients with primary stage III-IV or recurrent USC who were randomized to receive six cycles of carboplatin/paclitaxel alone or in combination with intravenous trastuzumab given until toxicity or progression.
The median PFS at a median follow-up of 25.9 months “very significantly favored” the trastuzumab arm, Dr. Nickles Fader said. The median PFS was 12.9 months in the trastuzumab arm and 8.0 months in the carboplatin/paclitaxel arm (hazard ratio, 0.46; P = .005).
In the 41 patients undergoing primary treatment, the median PFS was 17.7 months in the trastuzumab arm and 9.3 months in the control arm (HR, 0.44; P = .015). In the 17 patients with recurrent disease, the median PFS was 9.2 months and 7.0 months, respectively (HR, 0.12; P = .004).
“We were very pleased to see that there was also an overall survival benefit of about 5 months in the trastuzumab arm, compared to the control arm,” Dr. Nickles Fader said. The median OS was 29.6 months and 24.4 months, respectively (HR, 0.58; P = .046).
The PFS and OS benefit was “particularly striking” in the stage III-IV patients, according to Dr. Nickles Fader and colleagues. In this subgroup, the median OS was not reached in the trastuzumab arm, and it was 25.4 months in the control arm (HR, 0.49; P = .041).
Long-term toxicity did not differ between the treatment arms.
Applications and next steps
“The take-home message here is women should be tested if they have this subtype,” Dr. Nickles Fader said. “If they’re newly diagnosed, they should be tested for the HER2/neu receptor, and if [it is overexpressed] and they have advanced disease, we do recommend treatment with not only the conventional treatment, but with trastuzumab added to that, because that’s where we saw the most benefit.”
This is the only trial that has ever shown a major PFS and OS difference with combination targeted therapy and conventional chemotherapy in USC, Dr. Nickles Fader noted.
“So it was really exciting to see that,” she said, adding that a “much larger cooperative group trial” is being designed by the National Cancer Institute and NRG Oncology Group to look at this approach in HER2-positive, advanced-stage uterine cancers. The trial will include patients with USC, but it will extend to other uterine cancer types as well.
“We’re looking at different combinations of anti-HER2 therapies to sort of validate the results of this trial, but also to study this in other tumors that are HER2 positive,” Dr. Nickles Fader explained.
She also stressed the importance of addressing racial disparities in survival among women with USC, as African American women have higher rates of USC and related mortality than do other groups.
“It’s going to be important to look at not only molecular targets and improving survival but also racial inequalities and potentially epigenetics to really improve survival across the board,” Dr. Nickles Fader said.
She reported having no disclosures. The trial was sponsored by Yale University in collaboration with Genentech.
SOURCE: Nickles Fader A et al. SGO 2020, Abstract 12.
FROM SGO 2020
Tuberous Sclerosis With Segmental Overgrowth
To the Editor:
A 3-year-old boy with a history of tuberous sclerosis presented to our clinic for evaluation of bumps on the second and third fingers of the left hand. Physical examination revealed firm rubbery nodules on the palmar third metacarpophalangeal joint extending to the palm and the lateral aspect of the distal third dorsal finger. There also was asymmetric overgrowth of the left second and third digits consistent with bony segmental overgrowth (Figure).
Tuberous sclerosis and overgrowth syndromes including Proteus syndrome have mutations that share a common pathway, namely the PI3K/AKT/mTOR (phosphoinositide 3-kinase/alpha serine/threonine-protein kinase/mammalian target of rapamycin) pathway.1 The mutations in tuberous sclerosis involve the loss of TSC1 (TSC complex subunit 1) on chromosome 9 or TSC2 (TSC complex subunit 2) on chromosome 16.2 The protein products of these genes, hamartin and tuberin, act together as a tumor suppressor complex.3 The inheritance pattern of tuberous sclerosis is autosomal dominant, though two-thirds of cases are due to de novo germline mutations.4 The second copy of the gene must be lost spontaneously in any particular cell for the deleterious effects of the disease to manifest. The mutation in overgrowth syndromes including Proteus syndrome involves the activation of AKT1 (AKT serine/threonine kinase 1) on chromosome 14. This mutation occurs in somatic cells as opposed to germ cells, as in tuberous sclerosis. This difference accounts for the mosaic expression of segmental overgrowth syndromes. This concept has been demonstrated in overgrowth syndromes such as Proteus syndrome, with cells from unaffected areas having different genetic makeup than those from affected tissues.5 These mutations, though different, result in the downstream effects of unchecked messenger RNA translation and dysregulated cellular growth.
In our patient, we hypothesized that a small proportion of his postfertilization somatic cells underwent a second de novo mutation in the AKT1 pathway, resulting in the bony overgrowth seen on the left hand. We suspected that this second mutation could be an activation of AKT1, the mutation seen in Proteus syndrome. Sequencing of the tissue may be performed in the future, especially if segmental overgrowth continues and necessitates therapy.
- Wu Y, Zhou BP. Kinases meet at TSC. Cell Res. 2007;17:971-973.
- Roach SE, Sparagana SP. Diagnosis of tuberous sclerosis complex. J Child Neurol. 2004;19:643-649.
- Barker KT, Houlston RS. Overgrowth syndromes: is dysfunctional PI3-kinase signaling a unifying mechanism? Eur J Hum Genet. 2003;11:665-670.
- Nothrup H, Koenig MK, Au KS. Tuberous sclerosis complex. GeneReviews. Seattle, WA: University of Washington; 1999.
- Lindhurst MJ, Parker VE, Payne F, et al. Mosaic overgrowth with fibroadipose hyperplasia is caused by somatic activating mutations in PIK3CA. Nat Genet. 2012;44:928-933.
To the Editor:
A 3-year-old boy with a history of tuberous sclerosis presented to our clinic for evaluation of bumps on the second and third fingers of the left hand. Physical examination revealed firm rubbery nodules on the palmar third metacarpophalangeal joint extending to the palm and the lateral aspect of the distal third dorsal finger. There also was asymmetric overgrowth of the left second and third digits consistent with bony segmental overgrowth (Figure).
Tuberous sclerosis and overgrowth syndromes including Proteus syndrome have mutations that share a common pathway, namely the PI3K/AKT/mTOR (phosphoinositide 3-kinase/alpha serine/threonine-protein kinase/mammalian target of rapamycin) pathway.1 The mutations in tuberous sclerosis involve the loss of TSC1 (TSC complex subunit 1) on chromosome 9 or TSC2 (TSC complex subunit 2) on chromosome 16.2 The protein products of these genes, hamartin and tuberin, act together as a tumor suppressor complex.3 The inheritance pattern of tuberous sclerosis is autosomal dominant, though two-thirds of cases are due to de novo germline mutations.4 The second copy of the gene must be lost spontaneously in any particular cell for the deleterious effects of the disease to manifest. The mutation in overgrowth syndromes including Proteus syndrome involves the activation of AKT1 (AKT serine/threonine kinase 1) on chromosome 14. This mutation occurs in somatic cells as opposed to germ cells, as in tuberous sclerosis. This difference accounts for the mosaic expression of segmental overgrowth syndromes. This concept has been demonstrated in overgrowth syndromes such as Proteus syndrome, with cells from unaffected areas having different genetic makeup than those from affected tissues.5 These mutations, though different, result in the downstream effects of unchecked messenger RNA translation and dysregulated cellular growth.
In our patient, we hypothesized that a small proportion of his postfertilization somatic cells underwent a second de novo mutation in the AKT1 pathway, resulting in the bony overgrowth seen on the left hand. We suspected that this second mutation could be an activation of AKT1, the mutation seen in Proteus syndrome. Sequencing of the tissue may be performed in the future, especially if segmental overgrowth continues and necessitates therapy.
To the Editor:
A 3-year-old boy with a history of tuberous sclerosis presented to our clinic for evaluation of bumps on the second and third fingers of the left hand. Physical examination revealed firm rubbery nodules on the palmar third metacarpophalangeal joint extending to the palm and the lateral aspect of the distal third dorsal finger. There also was asymmetric overgrowth of the left second and third digits consistent with bony segmental overgrowth (Figure).
Tuberous sclerosis and overgrowth syndromes including Proteus syndrome have mutations that share a common pathway, namely the PI3K/AKT/mTOR (phosphoinositide 3-kinase/alpha serine/threonine-protein kinase/mammalian target of rapamycin) pathway.1 The mutations in tuberous sclerosis involve the loss of TSC1 (TSC complex subunit 1) on chromosome 9 or TSC2 (TSC complex subunit 2) on chromosome 16.2 The protein products of these genes, hamartin and tuberin, act together as a tumor suppressor complex.3 The inheritance pattern of tuberous sclerosis is autosomal dominant, though two-thirds of cases are due to de novo germline mutations.4 The second copy of the gene must be lost spontaneously in any particular cell for the deleterious effects of the disease to manifest. The mutation in overgrowth syndromes including Proteus syndrome involves the activation of AKT1 (AKT serine/threonine kinase 1) on chromosome 14. This mutation occurs in somatic cells as opposed to germ cells, as in tuberous sclerosis. This difference accounts for the mosaic expression of segmental overgrowth syndromes. This concept has been demonstrated in overgrowth syndromes such as Proteus syndrome, with cells from unaffected areas having different genetic makeup than those from affected tissues.5 These mutations, though different, result in the downstream effects of unchecked messenger RNA translation and dysregulated cellular growth.
In our patient, we hypothesized that a small proportion of his postfertilization somatic cells underwent a second de novo mutation in the AKT1 pathway, resulting in the bony overgrowth seen on the left hand. We suspected that this second mutation could be an activation of AKT1, the mutation seen in Proteus syndrome. Sequencing of the tissue may be performed in the future, especially if segmental overgrowth continues and necessitates therapy.
- Wu Y, Zhou BP. Kinases meet at TSC. Cell Res. 2007;17:971-973.
- Roach SE, Sparagana SP. Diagnosis of tuberous sclerosis complex. J Child Neurol. 2004;19:643-649.
- Barker KT, Houlston RS. Overgrowth syndromes: is dysfunctional PI3-kinase signaling a unifying mechanism? Eur J Hum Genet. 2003;11:665-670.
- Nothrup H, Koenig MK, Au KS. Tuberous sclerosis complex. GeneReviews. Seattle, WA: University of Washington; 1999.
- Lindhurst MJ, Parker VE, Payne F, et al. Mosaic overgrowth with fibroadipose hyperplasia is caused by somatic activating mutations in PIK3CA. Nat Genet. 2012;44:928-933.
- Wu Y, Zhou BP. Kinases meet at TSC. Cell Res. 2007;17:971-973.
- Roach SE, Sparagana SP. Diagnosis of tuberous sclerosis complex. J Child Neurol. 2004;19:643-649.
- Barker KT, Houlston RS. Overgrowth syndromes: is dysfunctional PI3-kinase signaling a unifying mechanism? Eur J Hum Genet. 2003;11:665-670.
- Nothrup H, Koenig MK, Au KS. Tuberous sclerosis complex. GeneReviews. Seattle, WA: University of Washington; 1999.
- Lindhurst MJ, Parker VE, Payne F, et al. Mosaic overgrowth with fibroadipose hyperplasia is caused by somatic activating mutations in PIK3CA. Nat Genet. 2012;44:928-933.
Practice Points
- Tuberous sclerosis and Proteus syndrome share a common downstream effector pathway.
- For a patient to demonstrate features of both tuberous sclerosis and Proteus syndrome, he/she must have both a germline mutation (for tuberous sclerosis) as well as a postzygotic mutation (for Proteus syndrome) of this shared pathway.
Can convalescent plasma treat COVID-19 patients?
As an Episcopal priest, Father Robert Pace of Fort Worth, TX, is used to putting others first and reaching out to help. So when the pulmonologist who helped him through his ordeal with COVID-19 asked if he would like to donate blood to help other patients, he did not hesitate.
“I said, ‘Absolutely,’” Pace, 53, recalls. He says the idea was ‘very appealing.’ ” During his ordeal with COVID-19 in March, he had spent 3 days in the hospital, isolated and on IV fluids and oxygen. He was short of breath, with a heartbeat more rapid than usual.
Now, fully recovered, his blood was a precious commodity, antibody-rich and potentially life-saving.
As researchers scramble to test drugs to fight COVID-19, others are turning to an age-old treatment. They’re collecting the blood of survivors and giving it to patients in the throes of a severe infection, a treatment known as convalescent plasma therapy.
Doctors say the treatment will probably serve as a bridge until other drugs and a vaccine become available.
Although the FDA considers the treatment investigational, in late March, it eased access to it. Patients can get it as part of a clinical trial or through an expanded access program overseen by hospitals or universities. A doctor can also request permission to use the treatment for a single patient.
“It is considered an emergent, compassionate need,” says John Burk, MD, a pulmonologist at Texas Health Harris Methodist Hospital, Fort Worth, who treated Pace. “It is a way to bring it to the bedside.” And the approval can happen quickly. Burk says he got one from the FDA just 20 minutes after requesting it for a severely ill patient.
How it works
The premise of how it works is “quite straightforward,” says Michael Joyner, MD, a professor of anesthesiology at the Mayo Clinic, Rochester, MN. “When someone is recovered and no longer symptomatic, you can harvest those antibodies from their blood and give them to someone else, and hopefully alter the course of their disease.” Joyner is the principal investigator for the FDA’s national Expanded Access to Convalescent Plasma for the Treatment of Patients with COVID-19, with 1,000 sites already signed on.
Convalescent therapy has been used to fight many other viruses, including Ebola, severe acute respiratory syndrome (SARS), the “bird” flu, H1N1 flu, and during the 1918 flu pandemic. Joyner says the strongest evidence for it comes from the 1950s, when it was used to treat a rodent-borne illness called Argentine hemorrhagic fever. Using convalescent plasma therapy for this infection reduced the death rate from nearly 43% before the treatment became common in the late 1950s to about 3% after it was widely used, one report found.
Data about convalescent therapy specifically for COVID-19 is limited. Chinese researchers reported on five critically ill patients, all on mechanical ventilation, treated with convalescent plasma after they had received antiviral and anti-inflammatory medicines. Three could leave the hospital after 51-55 days, and two were in stable condition in the hospital 37 days after the transfusion.
In another study of 10 severely ill patients, symptoms went away or improved in all 10 within 1 to 3 days after the transfusion. Two of the three on ventilators were weaned off and put on oxygen instead. None died.
Chinese researchers also reported three cases of patients with COVID-19 given the convalescent therapy who had a satisfactory recovery.
Researchers who reviewed the track record of convalescent therapy for other conditions recently concluded that the treatment doesn’t appear to cause severe side effects and it should be studied for COVID-19.
Although information on side effects specific to this treatment is evolving, Joyner says they are “very, very low.”
According to the FDA, allergic reactions can occur with plasma therapies. Because the treatment for COVID-19 is new, it is not known if patients might have other types of reactions.
Who can donate?
Blood bank officials and researchers running the convalescent plasma programs say the desire to help is widespread, and they’ve been deluged with offers to donate. But requirements are strict.
Donors must have evidence of COVID-19 infection, documented in a variety of ways, such as a diagnostic test by nasal swab or a blood test showing antibodies. And they must be symptom-free for 14 days, with test results, or 28 days without.
The treatment involves collecting plasma, not whole blood. Plasma, the liquid part of the blood, helps with clotting and supports immunity. During the collection, a donor’s blood is put through a machine that collects the plasma only and sends the red blood cells and platelets back to the donor.
Clinical trials
Requirements may be more stringent for donors joining a formal clinical trial rather than an expanded access program. For instance, potential donors in a randomized clinical trial underway at Stony Brook University must have higher antibody levels than required by the FDA, says study leader Elliott Bennett-Guerrero, MD, medical director of perioperative quality and patient safety and professor at the Renaissance School of Medicine.
He hopes to enroll up to 500 patients from the Long Island, NY, area. While clinical trials typically have a 50-50 split, with half of subjects getting a treatment and half a placebo, Bennett-Guerrero’s study will give 80% of patients the convalescent plasma and 20% standard plasma.
Julia Sabia Motley, 57, of Merrick, NY, is hoping to become a donor for the Stony Brook study. She and her husband, Sean Motley, 59, tested positive in late March. She has to pass one more test to join the trial. Her husband is also planning to try to donate. “I can finally do something,” Sabia Motley says. Her son is in the MD-PhD program at Stony Brook and told her about the study.
Many questions remain
The treatment for COVID-19 is in its infancy. Burk has given the convalescent plasma to two patients. One is now recovering at home, and the other is on a ventilator but improving, he says.
About 200 nationwide have received the therapy, Joyner says. He expects blood supplies to increase as more people are eligible to donate.
Questions remain about how effective the convalescent therapy will be. While experts know that the COVID-19 antibodies “can be helpful in fighting the virus, we don’t know how long the antibodies in the plasma would stay in place,” Bennett-Guerrero says.
Nor do doctors know who the therapy might work best for, beyond people with a severe or life-threatening illness. When it’s been used for other infections, it’s generally given in early stages once someone has symptoms, Joyner says.
Joyner says he sees the treatment as a stopgap ‘’until concentrated antibodies are available.” Several drug companies are working to retrieve antibodies from donors and make concentrated antibody drugs.
“Typically we would think convalescent plasma might be a helpful bridge until therapies that are safe and effective and can be mass-produced are available, such as a vaccine or a drug,” Bennett-Guerrero says.
Even so, he says that he doesn’t think he will have a problem attracting donors, and that he will have repeat donors eager to help.
More information for potential donors
Blood banks, the American Red Cross, and others involved in convalescent plasma therapy have posted information online for potential donors. People who don’t meet the qualifications for COVID-19 plasma donations are welcomed as regular blood donors if they meet those criteria
According to the FDA, a donation could potentially help save the lives of up to four COVID-19 patients.
Father Pace is already planning another visit to the blood bank. To pass the time last time, he says, he prayed for the person who would eventually get his blood.
This article first appeared on WebMD.com.
As an Episcopal priest, Father Robert Pace of Fort Worth, TX, is used to putting others first and reaching out to help. So when the pulmonologist who helped him through his ordeal with COVID-19 asked if he would like to donate blood to help other patients, he did not hesitate.
“I said, ‘Absolutely,’” Pace, 53, recalls. He says the idea was ‘very appealing.’ ” During his ordeal with COVID-19 in March, he had spent 3 days in the hospital, isolated and on IV fluids and oxygen. He was short of breath, with a heartbeat more rapid than usual.
Now, fully recovered, his blood was a precious commodity, antibody-rich and potentially life-saving.
As researchers scramble to test drugs to fight COVID-19, others are turning to an age-old treatment. They’re collecting the blood of survivors and giving it to patients in the throes of a severe infection, a treatment known as convalescent plasma therapy.
Doctors say the treatment will probably serve as a bridge until other drugs and a vaccine become available.
Although the FDA considers the treatment investigational, in late March, it eased access to it. Patients can get it as part of a clinical trial or through an expanded access program overseen by hospitals or universities. A doctor can also request permission to use the treatment for a single patient.
“It is considered an emergent, compassionate need,” says John Burk, MD, a pulmonologist at Texas Health Harris Methodist Hospital, Fort Worth, who treated Pace. “It is a way to bring it to the bedside.” And the approval can happen quickly. Burk says he got one from the FDA just 20 minutes after requesting it for a severely ill patient.
How it works
The premise of how it works is “quite straightforward,” says Michael Joyner, MD, a professor of anesthesiology at the Mayo Clinic, Rochester, MN. “When someone is recovered and no longer symptomatic, you can harvest those antibodies from their blood and give them to someone else, and hopefully alter the course of their disease.” Joyner is the principal investigator for the FDA’s national Expanded Access to Convalescent Plasma for the Treatment of Patients with COVID-19, with 1,000 sites already signed on.
Convalescent therapy has been used to fight many other viruses, including Ebola, severe acute respiratory syndrome (SARS), the “bird” flu, H1N1 flu, and during the 1918 flu pandemic. Joyner says the strongest evidence for it comes from the 1950s, when it was used to treat a rodent-borne illness called Argentine hemorrhagic fever. Using convalescent plasma therapy for this infection reduced the death rate from nearly 43% before the treatment became common in the late 1950s to about 3% after it was widely used, one report found.
Data about convalescent therapy specifically for COVID-19 is limited. Chinese researchers reported on five critically ill patients, all on mechanical ventilation, treated with convalescent plasma after they had received antiviral and anti-inflammatory medicines. Three could leave the hospital after 51-55 days, and two were in stable condition in the hospital 37 days after the transfusion.
In another study of 10 severely ill patients, symptoms went away or improved in all 10 within 1 to 3 days after the transfusion. Two of the three on ventilators were weaned off and put on oxygen instead. None died.
Chinese researchers also reported three cases of patients with COVID-19 given the convalescent therapy who had a satisfactory recovery.
Researchers who reviewed the track record of convalescent therapy for other conditions recently concluded that the treatment doesn’t appear to cause severe side effects and it should be studied for COVID-19.
Although information on side effects specific to this treatment is evolving, Joyner says they are “very, very low.”
According to the FDA, allergic reactions can occur with plasma therapies. Because the treatment for COVID-19 is new, it is not known if patients might have other types of reactions.
Who can donate?
Blood bank officials and researchers running the convalescent plasma programs say the desire to help is widespread, and they’ve been deluged with offers to donate. But requirements are strict.
Donors must have evidence of COVID-19 infection, documented in a variety of ways, such as a diagnostic test by nasal swab or a blood test showing antibodies. And they must be symptom-free for 14 days, with test results, or 28 days without.
The treatment involves collecting plasma, not whole blood. Plasma, the liquid part of the blood, helps with clotting and supports immunity. During the collection, a donor’s blood is put through a machine that collects the plasma only and sends the red blood cells and platelets back to the donor.
Clinical trials
Requirements may be more stringent for donors joining a formal clinical trial rather than an expanded access program. For instance, potential donors in a randomized clinical trial underway at Stony Brook University must have higher antibody levels than required by the FDA, says study leader Elliott Bennett-Guerrero, MD, medical director of perioperative quality and patient safety and professor at the Renaissance School of Medicine.
He hopes to enroll up to 500 patients from the Long Island, NY, area. While clinical trials typically have a 50-50 split, with half of subjects getting a treatment and half a placebo, Bennett-Guerrero’s study will give 80% of patients the convalescent plasma and 20% standard plasma.
Julia Sabia Motley, 57, of Merrick, NY, is hoping to become a donor for the Stony Brook study. She and her husband, Sean Motley, 59, tested positive in late March. She has to pass one more test to join the trial. Her husband is also planning to try to donate. “I can finally do something,” Sabia Motley says. Her son is in the MD-PhD program at Stony Brook and told her about the study.
Many questions remain
The treatment for COVID-19 is in its infancy. Burk has given the convalescent plasma to two patients. One is now recovering at home, and the other is on a ventilator but improving, he says.
About 200 nationwide have received the therapy, Joyner says. He expects blood supplies to increase as more people are eligible to donate.
Questions remain about how effective the convalescent therapy will be. While experts know that the COVID-19 antibodies “can be helpful in fighting the virus, we don’t know how long the antibodies in the plasma would stay in place,” Bennett-Guerrero says.
Nor do doctors know who the therapy might work best for, beyond people with a severe or life-threatening illness. When it’s been used for other infections, it’s generally given in early stages once someone has symptoms, Joyner says.
Joyner says he sees the treatment as a stopgap ‘’until concentrated antibodies are available.” Several drug companies are working to retrieve antibodies from donors and make concentrated antibody drugs.
“Typically we would think convalescent plasma might be a helpful bridge until therapies that are safe and effective and can be mass-produced are available, such as a vaccine or a drug,” Bennett-Guerrero says.
Even so, he says that he doesn’t think he will have a problem attracting donors, and that he will have repeat donors eager to help.
More information for potential donors
Blood banks, the American Red Cross, and others involved in convalescent plasma therapy have posted information online for potential donors. People who don’t meet the qualifications for COVID-19 plasma donations are welcomed as regular blood donors if they meet those criteria
According to the FDA, a donation could potentially help save the lives of up to four COVID-19 patients.
Father Pace is already planning another visit to the blood bank. To pass the time last time, he says, he prayed for the person who would eventually get his blood.
This article first appeared on WebMD.com.
As an Episcopal priest, Father Robert Pace of Fort Worth, TX, is used to putting others first and reaching out to help. So when the pulmonologist who helped him through his ordeal with COVID-19 asked if he would like to donate blood to help other patients, he did not hesitate.
“I said, ‘Absolutely,’” Pace, 53, recalls. He says the idea was ‘very appealing.’ ” During his ordeal with COVID-19 in March, he had spent 3 days in the hospital, isolated and on IV fluids and oxygen. He was short of breath, with a heartbeat more rapid than usual.
Now, fully recovered, his blood was a precious commodity, antibody-rich and potentially life-saving.
As researchers scramble to test drugs to fight COVID-19, others are turning to an age-old treatment. They’re collecting the blood of survivors and giving it to patients in the throes of a severe infection, a treatment known as convalescent plasma therapy.
Doctors say the treatment will probably serve as a bridge until other drugs and a vaccine become available.
Although the FDA considers the treatment investigational, in late March, it eased access to it. Patients can get it as part of a clinical trial or through an expanded access program overseen by hospitals or universities. A doctor can also request permission to use the treatment for a single patient.
“It is considered an emergent, compassionate need,” says John Burk, MD, a pulmonologist at Texas Health Harris Methodist Hospital, Fort Worth, who treated Pace. “It is a way to bring it to the bedside.” And the approval can happen quickly. Burk says he got one from the FDA just 20 minutes after requesting it for a severely ill patient.
How it works
The premise of how it works is “quite straightforward,” says Michael Joyner, MD, a professor of anesthesiology at the Mayo Clinic, Rochester, MN. “When someone is recovered and no longer symptomatic, you can harvest those antibodies from their blood and give them to someone else, and hopefully alter the course of their disease.” Joyner is the principal investigator for the FDA’s national Expanded Access to Convalescent Plasma for the Treatment of Patients with COVID-19, with 1,000 sites already signed on.
Convalescent therapy has been used to fight many other viruses, including Ebola, severe acute respiratory syndrome (SARS), the “bird” flu, H1N1 flu, and during the 1918 flu pandemic. Joyner says the strongest evidence for it comes from the 1950s, when it was used to treat a rodent-borne illness called Argentine hemorrhagic fever. Using convalescent plasma therapy for this infection reduced the death rate from nearly 43% before the treatment became common in the late 1950s to about 3% after it was widely used, one report found.
Data about convalescent therapy specifically for COVID-19 is limited. Chinese researchers reported on five critically ill patients, all on mechanical ventilation, treated with convalescent plasma after they had received antiviral and anti-inflammatory medicines. Three could leave the hospital after 51-55 days, and two were in stable condition in the hospital 37 days after the transfusion.
In another study of 10 severely ill patients, symptoms went away or improved in all 10 within 1 to 3 days after the transfusion. Two of the three on ventilators were weaned off and put on oxygen instead. None died.
Chinese researchers also reported three cases of patients with COVID-19 given the convalescent therapy who had a satisfactory recovery.
Researchers who reviewed the track record of convalescent therapy for other conditions recently concluded that the treatment doesn’t appear to cause severe side effects and it should be studied for COVID-19.
Although information on side effects specific to this treatment is evolving, Joyner says they are “very, very low.”
According to the FDA, allergic reactions can occur with plasma therapies. Because the treatment for COVID-19 is new, it is not known if patients might have other types of reactions.
Who can donate?
Blood bank officials and researchers running the convalescent plasma programs say the desire to help is widespread, and they’ve been deluged with offers to donate. But requirements are strict.
Donors must have evidence of COVID-19 infection, documented in a variety of ways, such as a diagnostic test by nasal swab or a blood test showing antibodies. And they must be symptom-free for 14 days, with test results, or 28 days without.
The treatment involves collecting plasma, not whole blood. Plasma, the liquid part of the blood, helps with clotting and supports immunity. During the collection, a donor’s blood is put through a machine that collects the plasma only and sends the red blood cells and platelets back to the donor.
Clinical trials
Requirements may be more stringent for donors joining a formal clinical trial rather than an expanded access program. For instance, potential donors in a randomized clinical trial underway at Stony Brook University must have higher antibody levels than required by the FDA, says study leader Elliott Bennett-Guerrero, MD, medical director of perioperative quality and patient safety and professor at the Renaissance School of Medicine.
He hopes to enroll up to 500 patients from the Long Island, NY, area. While clinical trials typically have a 50-50 split, with half of subjects getting a treatment and half a placebo, Bennett-Guerrero’s study will give 80% of patients the convalescent plasma and 20% standard plasma.
Julia Sabia Motley, 57, of Merrick, NY, is hoping to become a donor for the Stony Brook study. She and her husband, Sean Motley, 59, tested positive in late March. She has to pass one more test to join the trial. Her husband is also planning to try to donate. “I can finally do something,” Sabia Motley says. Her son is in the MD-PhD program at Stony Brook and told her about the study.
Many questions remain
The treatment for COVID-19 is in its infancy. Burk has given the convalescent plasma to two patients. One is now recovering at home, and the other is on a ventilator but improving, he says.
About 200 nationwide have received the therapy, Joyner says. He expects blood supplies to increase as more people are eligible to donate.
Questions remain about how effective the convalescent therapy will be. While experts know that the COVID-19 antibodies “can be helpful in fighting the virus, we don’t know how long the antibodies in the plasma would stay in place,” Bennett-Guerrero says.
Nor do doctors know who the therapy might work best for, beyond people with a severe or life-threatening illness. When it’s been used for other infections, it’s generally given in early stages once someone has symptoms, Joyner says.
Joyner says he sees the treatment as a stopgap ‘’until concentrated antibodies are available.” Several drug companies are working to retrieve antibodies from donors and make concentrated antibody drugs.
“Typically we would think convalescent plasma might be a helpful bridge until therapies that are safe and effective and can be mass-produced are available, such as a vaccine or a drug,” Bennett-Guerrero says.
Even so, he says that he doesn’t think he will have a problem attracting donors, and that he will have repeat donors eager to help.
More information for potential donors
Blood banks, the American Red Cross, and others involved in convalescent plasma therapy have posted information online for potential donors. People who don’t meet the qualifications for COVID-19 plasma donations are welcomed as regular blood donors if they meet those criteria
According to the FDA, a donation could potentially help save the lives of up to four COVID-19 patients.
Father Pace is already planning another visit to the blood bank. To pass the time last time, he says, he prayed for the person who would eventually get his blood.
This article first appeared on WebMD.com.
Protean manifestations of COVID-19: “Our ignorance is profound”
Although a cause-and-effect relationship is unknown, people with the virus have presented with or developed heart disease, acute liver injury, ongoing GI issues, skin manifestations, neurologic damage, and other problems, especially among sicker people.
For example, French physicians described an association with encephalopathy, agitation, confusion, and corticospinal tract signs among 58 people hospitalized with acute respiratory distress (N Engl J Med. 2020 Apr 15. doi: 10.1056/NEJMc2008597).
In particular, Yale New Haven (Conn.) Hospital is dealing with unexpected complications up close. Almost half of the beds there are occupied by COVID-19 patients. Over 100 people are in the ICU, and almost 70 intubated. Of the more than 750 COVID admissions so far, only about 350 have been discharged. “Even in a bad flu season, you never see something like this; it’s just unheard of,” said Harlan Krumholz, MD, a Yale cardiologist and professor of medicine helping lead the efforts there.
Kidney injuries prominent
“When they get to the ICU, we are seeing lots of people with acute kidney injuries; lots of people developing endocrine problems; people having blood sugar control issues, coagulation issues, blood clots. We are just waking up to the wide range of ways this virus can affect people. Our ignorance is profound,” Dr. Krumholz said, but physicians “recognize that this thing has the capability of attacking almost every single organ system, and it may or may not present with respiratory symptoms.”
It’s a similar story at Mt. Sinai South Nassau, a hospital in Oceanside, N.Y. “We’ve seen a lot of renal injury in people having complications, a lot of acute dialysis,” but it’s unclear how much is caused by the virus and how much is simply because people are so sick, said Aaron Glatt, MD, infectious disease professor and chair of medicine at the hospital. However, he said things are looking brighter than at Yale.
“We are not seeing the same level of increase in cases that we had previously, and we are starting to see extubations and discharges. We’ve treated a number of patients with plasma therapy, and hopefully that will be of benefit. We’ve seen some response to” the immunosuppressive “tocilizumab [Actemra], and a lot of response to very good respiratory therapy. I think we are starting to flatten the curve,” Dr. Glatt said.
“Look for tricky symptoms”
The growing awareness of COVID’s protean manifestations is evident in Medscape’s Consult forum, an online community where physicians and medical students share information and seek advice; there’s been over 200 COVID-19 cases and questions since January.
Early on, traffic was mostly about typical pulmonary presentations, but lately it’s shifted to nonrespiratory involvement. Physicians want to know if what they are seeing is related to the virus, and if other people are seeing the same things.
There’s a case on Consult of a 37-year-old man with stomach pain, vomiting, and diarrhea, but no respiratory symptoms and a positive COVID test. A chest CT incidental to his abdominal scan revealed significant bilateral lung involvement.
A 69-year-old woman with a history of laparotomy and new onset intestinal subocclusion had only adhesions on a subsequent exploratory laparotomy, and was doing okay otherwise. She suddenly went into respiratory failure with progressive bradycardia and died 3 days later. Aspiration pneumonia, pulmonary embolism, and MI had been ruled out. “The pattern of cardiovascular failure was in favor of myocarditis, but we don’t have any other clue,” the physician said after describing a second similar case.
Another doctor on the forum reported elevated cardiac enzymes without coronary artery obstruction in a positive patient who went into shock, with an ejection fraction of 40% and markedly increased heart wall thickness, but no lung involvement. There are also two cases of idiopathic thrombocytopenia without fever of hypoxia.
An Italian gastroenterologist said: “Look for tricky symptoms.” Expand “patient history, asking about the sudden occurrence of dysgeusia and/or anosmia. These symptoms have become my guiding diagnostic light” in Verona. “Most patients become nauseated, [and] the taste of any food is unbearable. When I find these symptoms by history, the patient is COVID positive 100%.”
‘Make sure that they didn’t die in vain’
There was interest in those and other reports on Consult, and comments from physicians who have theories, but no certain answers about what is, and is not, caused by the virus.
Direct viral attack is likely a part of it, said Stanley Perlman, MD, PhD, a professor of microbiology and immunology at the University of Iowa, Iowa City.
The ACE2 receptor the virus uses to enter cells is common in many organs, plus there were extrapulmonary manifestations with severe acute respiratory syndrome (SARS), another pandemic caused by a zoonotic coronavirus almost 20 years ago. At least with SARS, “many organs were infected when examined at autopsy,” he said.
The body’s inflammatory response is almost certainly also in play. Progressive derangements in inflammatory markers – C-reactive protein, D-dimer, ferritin – correlate with worse prognosis, and “the cytokine storm that occurs in these patients can lead to a degree of encephalopathy, myocarditis, liver impairment, and kidney impairment; multiorgan dysfunction, in other words,” said William Shaffner, MD, a professor of preventive medicine and infectious diseases at Vanderbilt University Medical Center, Nashville, Tenn.
But in some cases, the virus might simply be a bystander to an unrelated disease process; in others, the experimental treatments being used might cause problems. Indeed, cardiology groups recently warned of torsade de pointes – a dangerously abnormal heart rhythm – with hydroxychloroquine and azithromycin.
“We think it’s some combination,” but don’t really know, Dr. Krumholz said. In the meantime, “we are forced to treat patients by instinct and first principles,” and long-term sequelae are unknown. “We don’t want to be in this position for long.”
To that end, he said, “this is the time for us all to hold hands and be together because we need to learn rapidly from each other. Our job is both to care for the people in front of us and make sure that they didn’t die in vain, that the experience they had is funneled into a larger set of data to make sure the next person is better off.”
Although a cause-and-effect relationship is unknown, people with the virus have presented with or developed heart disease, acute liver injury, ongoing GI issues, skin manifestations, neurologic damage, and other problems, especially among sicker people.
For example, French physicians described an association with encephalopathy, agitation, confusion, and corticospinal tract signs among 58 people hospitalized with acute respiratory distress (N Engl J Med. 2020 Apr 15. doi: 10.1056/NEJMc2008597).
In particular, Yale New Haven (Conn.) Hospital is dealing with unexpected complications up close. Almost half of the beds there are occupied by COVID-19 patients. Over 100 people are in the ICU, and almost 70 intubated. Of the more than 750 COVID admissions so far, only about 350 have been discharged. “Even in a bad flu season, you never see something like this; it’s just unheard of,” said Harlan Krumholz, MD, a Yale cardiologist and professor of medicine helping lead the efforts there.
Kidney injuries prominent
“When they get to the ICU, we are seeing lots of people with acute kidney injuries; lots of people developing endocrine problems; people having blood sugar control issues, coagulation issues, blood clots. We are just waking up to the wide range of ways this virus can affect people. Our ignorance is profound,” Dr. Krumholz said, but physicians “recognize that this thing has the capability of attacking almost every single organ system, and it may or may not present with respiratory symptoms.”
It’s a similar story at Mt. Sinai South Nassau, a hospital in Oceanside, N.Y. “We’ve seen a lot of renal injury in people having complications, a lot of acute dialysis,” but it’s unclear how much is caused by the virus and how much is simply because people are so sick, said Aaron Glatt, MD, infectious disease professor and chair of medicine at the hospital. However, he said things are looking brighter than at Yale.
“We are not seeing the same level of increase in cases that we had previously, and we are starting to see extubations and discharges. We’ve treated a number of patients with plasma therapy, and hopefully that will be of benefit. We’ve seen some response to” the immunosuppressive “tocilizumab [Actemra], and a lot of response to very good respiratory therapy. I think we are starting to flatten the curve,” Dr. Glatt said.
“Look for tricky symptoms”
The growing awareness of COVID’s protean manifestations is evident in Medscape’s Consult forum, an online community where physicians and medical students share information and seek advice; there’s been over 200 COVID-19 cases and questions since January.
Early on, traffic was mostly about typical pulmonary presentations, but lately it’s shifted to nonrespiratory involvement. Physicians want to know if what they are seeing is related to the virus, and if other people are seeing the same things.
There’s a case on Consult of a 37-year-old man with stomach pain, vomiting, and diarrhea, but no respiratory symptoms and a positive COVID test. A chest CT incidental to his abdominal scan revealed significant bilateral lung involvement.
A 69-year-old woman with a history of laparotomy and new onset intestinal subocclusion had only adhesions on a subsequent exploratory laparotomy, and was doing okay otherwise. She suddenly went into respiratory failure with progressive bradycardia and died 3 days later. Aspiration pneumonia, pulmonary embolism, and MI had been ruled out. “The pattern of cardiovascular failure was in favor of myocarditis, but we don’t have any other clue,” the physician said after describing a second similar case.
Another doctor on the forum reported elevated cardiac enzymes without coronary artery obstruction in a positive patient who went into shock, with an ejection fraction of 40% and markedly increased heart wall thickness, but no lung involvement. There are also two cases of idiopathic thrombocytopenia without fever of hypoxia.
An Italian gastroenterologist said: “Look for tricky symptoms.” Expand “patient history, asking about the sudden occurrence of dysgeusia and/or anosmia. These symptoms have become my guiding diagnostic light” in Verona. “Most patients become nauseated, [and] the taste of any food is unbearable. When I find these symptoms by history, the patient is COVID positive 100%.”
‘Make sure that they didn’t die in vain’
There was interest in those and other reports on Consult, and comments from physicians who have theories, but no certain answers about what is, and is not, caused by the virus.
Direct viral attack is likely a part of it, said Stanley Perlman, MD, PhD, a professor of microbiology and immunology at the University of Iowa, Iowa City.
The ACE2 receptor the virus uses to enter cells is common in many organs, plus there were extrapulmonary manifestations with severe acute respiratory syndrome (SARS), another pandemic caused by a zoonotic coronavirus almost 20 years ago. At least with SARS, “many organs were infected when examined at autopsy,” he said.
The body’s inflammatory response is almost certainly also in play. Progressive derangements in inflammatory markers – C-reactive protein, D-dimer, ferritin – correlate with worse prognosis, and “the cytokine storm that occurs in these patients can lead to a degree of encephalopathy, myocarditis, liver impairment, and kidney impairment; multiorgan dysfunction, in other words,” said William Shaffner, MD, a professor of preventive medicine and infectious diseases at Vanderbilt University Medical Center, Nashville, Tenn.
But in some cases, the virus might simply be a bystander to an unrelated disease process; in others, the experimental treatments being used might cause problems. Indeed, cardiology groups recently warned of torsade de pointes – a dangerously abnormal heart rhythm – with hydroxychloroquine and azithromycin.
“We think it’s some combination,” but don’t really know, Dr. Krumholz said. In the meantime, “we are forced to treat patients by instinct and first principles,” and long-term sequelae are unknown. “We don’t want to be in this position for long.”
To that end, he said, “this is the time for us all to hold hands and be together because we need to learn rapidly from each other. Our job is both to care for the people in front of us and make sure that they didn’t die in vain, that the experience they had is funneled into a larger set of data to make sure the next person is better off.”
Although a cause-and-effect relationship is unknown, people with the virus have presented with or developed heart disease, acute liver injury, ongoing GI issues, skin manifestations, neurologic damage, and other problems, especially among sicker people.
For example, French physicians described an association with encephalopathy, agitation, confusion, and corticospinal tract signs among 58 people hospitalized with acute respiratory distress (N Engl J Med. 2020 Apr 15. doi: 10.1056/NEJMc2008597).
In particular, Yale New Haven (Conn.) Hospital is dealing with unexpected complications up close. Almost half of the beds there are occupied by COVID-19 patients. Over 100 people are in the ICU, and almost 70 intubated. Of the more than 750 COVID admissions so far, only about 350 have been discharged. “Even in a bad flu season, you never see something like this; it’s just unheard of,” said Harlan Krumholz, MD, a Yale cardiologist and professor of medicine helping lead the efforts there.
Kidney injuries prominent
“When they get to the ICU, we are seeing lots of people with acute kidney injuries; lots of people developing endocrine problems; people having blood sugar control issues, coagulation issues, blood clots. We are just waking up to the wide range of ways this virus can affect people. Our ignorance is profound,” Dr. Krumholz said, but physicians “recognize that this thing has the capability of attacking almost every single organ system, and it may or may not present with respiratory symptoms.”
It’s a similar story at Mt. Sinai South Nassau, a hospital in Oceanside, N.Y. “We’ve seen a lot of renal injury in people having complications, a lot of acute dialysis,” but it’s unclear how much is caused by the virus and how much is simply because people are so sick, said Aaron Glatt, MD, infectious disease professor and chair of medicine at the hospital. However, he said things are looking brighter than at Yale.
“We are not seeing the same level of increase in cases that we had previously, and we are starting to see extubations and discharges. We’ve treated a number of patients with plasma therapy, and hopefully that will be of benefit. We’ve seen some response to” the immunosuppressive “tocilizumab [Actemra], and a lot of response to very good respiratory therapy. I think we are starting to flatten the curve,” Dr. Glatt said.
“Look for tricky symptoms”
The growing awareness of COVID’s protean manifestations is evident in Medscape’s Consult forum, an online community where physicians and medical students share information and seek advice; there’s been over 200 COVID-19 cases and questions since January.
Early on, traffic was mostly about typical pulmonary presentations, but lately it’s shifted to nonrespiratory involvement. Physicians want to know if what they are seeing is related to the virus, and if other people are seeing the same things.
There’s a case on Consult of a 37-year-old man with stomach pain, vomiting, and diarrhea, but no respiratory symptoms and a positive COVID test. A chest CT incidental to his abdominal scan revealed significant bilateral lung involvement.
A 69-year-old woman with a history of laparotomy and new onset intestinal subocclusion had only adhesions on a subsequent exploratory laparotomy, and was doing okay otherwise. She suddenly went into respiratory failure with progressive bradycardia and died 3 days later. Aspiration pneumonia, pulmonary embolism, and MI had been ruled out. “The pattern of cardiovascular failure was in favor of myocarditis, but we don’t have any other clue,” the physician said after describing a second similar case.
Another doctor on the forum reported elevated cardiac enzymes without coronary artery obstruction in a positive patient who went into shock, with an ejection fraction of 40% and markedly increased heart wall thickness, but no lung involvement. There are also two cases of idiopathic thrombocytopenia without fever of hypoxia.
An Italian gastroenterologist said: “Look for tricky symptoms.” Expand “patient history, asking about the sudden occurrence of dysgeusia and/or anosmia. These symptoms have become my guiding diagnostic light” in Verona. “Most patients become nauseated, [and] the taste of any food is unbearable. When I find these symptoms by history, the patient is COVID positive 100%.”
‘Make sure that they didn’t die in vain’
There was interest in those and other reports on Consult, and comments from physicians who have theories, but no certain answers about what is, and is not, caused by the virus.
Direct viral attack is likely a part of it, said Stanley Perlman, MD, PhD, a professor of microbiology and immunology at the University of Iowa, Iowa City.
The ACE2 receptor the virus uses to enter cells is common in many organs, plus there were extrapulmonary manifestations with severe acute respiratory syndrome (SARS), another pandemic caused by a zoonotic coronavirus almost 20 years ago. At least with SARS, “many organs were infected when examined at autopsy,” he said.
The body’s inflammatory response is almost certainly also in play. Progressive derangements in inflammatory markers – C-reactive protein, D-dimer, ferritin – correlate with worse prognosis, and “the cytokine storm that occurs in these patients can lead to a degree of encephalopathy, myocarditis, liver impairment, and kidney impairment; multiorgan dysfunction, in other words,” said William Shaffner, MD, a professor of preventive medicine and infectious diseases at Vanderbilt University Medical Center, Nashville, Tenn.
But in some cases, the virus might simply be a bystander to an unrelated disease process; in others, the experimental treatments being used might cause problems. Indeed, cardiology groups recently warned of torsade de pointes – a dangerously abnormal heart rhythm – with hydroxychloroquine and azithromycin.
“We think it’s some combination,” but don’t really know, Dr. Krumholz said. In the meantime, “we are forced to treat patients by instinct and first principles,” and long-term sequelae are unknown. “We don’t want to be in this position for long.”
To that end, he said, “this is the time for us all to hold hands and be together because we need to learn rapidly from each other. Our job is both to care for the people in front of us and make sure that they didn’t die in vain, that the experience they had is funneled into a larger set of data to make sure the next person is better off.”
The resurgence of Plaquenil (hydroxychloroquine)
Two of the most unusual dermatologic drugs have resurged as possible first-line therapy for rescue treatment of hospitalized patients with SARS-CoV-2, despite extremely limited clinical data supporting their efficacy, optimal dose, treatment duration, and potential adverse effects.
Chloroquine and hydroxychloroquine were introduced as treatment and prophylaxis of malaria and approved by the Food and Drug Administration in 1949 and 1955, respectively. They belong to a class of drugs called 4-aminoquinolones and have a flat aromatic core and a basic side chain. The basic property of these drugs contribute to their ability to accumulate in lysosomes. They have a large volume of distribution in the blood and a half-life of 40-60 days. Important interactions include use with tamoxifen, proton pump inhibitors, and with smoking. Although both drugs cross the placenta, they don’t have any notable effects on the fetus.
Chloroquine and hydroxychloroquine enter the cell and accumulate in the lysosomes along a pH gradient. Within the lysosome, they increase the pH, thereby stabilizing lysosomes and inhibiting eosinophil and neutrophil chemotaxis and phagocytic activity. They also inhibit complement-mediated hemolysis, reduce acute phase reactants, and prevent MHC class II–mediated auto antigen presentation. Additionally, they decrease cell-mediated immunity by decreasing the production of interleukin-1 and plasma cell synthesis. Hydroxychloroquine can also accumulate in endosomes and inhibit toll-like receptor signaling, thereby reducing the production of proinflammatory cytokines.
One of the ways SARS-CoV-2 enters cells is by up-regulating and binding to ACE2. Chloroquine/hydroxychloroquine reduce glycosylation of ACE2 and thus inhibit viral entry. Additionally, by increasing the endosomal pH, they potentially inactivate enzymes that viruses require for replication. Their lifesaving benefits, however, are thought to involve blocking the proinflammatory cytokine IL-6 and suppressing the cytokine storm thought to induce acute respiratory distress syndrome. Interestingly, chloroquine has also been shown to allow zinc ions into the cell, and zinc is a potent inhibitor of coronavirus RNA polymerase.
Side effects of chloroquine and hydroxychloroquine include GI upset, retinal toxicity with long-term use, hypoglycemia, cardiomyopathy, QT prolongation, ventricular arrhythmias, and renal and liver toxicity. Adverse effects have been observed with long-term daily doses of more than 3.5 mg/kg of chloroquine or more than 6.5 mg/kg of hydroxychloroquine. Cutaneous effects include pruritus, morbilliform rashes (in an estimated 10% of those treated) and psoriasis flares, and blue-black hyperpigmentation (in about 25%) of the shins, face, oral palate, and nails.
Initial In February 2020, the first clinical results of 100 patients treated with chloroquine were reported in a news briefing by the Chinese government. On March 20, the first clinical trial was published offering guidelines for the treatment of COVID-19 using hydroxychloroquine and azithromycin combination therapy – albeit with many limitations and reported biases in the study. Despite the poorly designed studies and inconclusive evidence, on March 28, the FDA issued an Emergency Use Authorization that allows providers to request a supply of hydroxychloroquine or chloroquine for hospitalized patients with COVID-19 who are unable to join a clinical trial.
On April 2, the first clinical trial to evaluate the safety and efficacy of hydroxychloroquine in adults hospitalized with COVID-19 began at Vanderbilt University Medical Center, Nashville, Tenn. The ORCHID trial (Outcomes Related to COVID-19 Treated With Hydroxychloroquine Among In-patients With Symptomatic Disease), funded by the National Heart, Lung, and Blood Institute. This blinded, placebo-controlled study is evaluating hydroxychloroquine treatment of hospitalized patients with COVID-19 in hopes of treating the severe complications of acute respiratory distress syndrome. Participants are randomly assigned to receive 400 mg hydroxychloroquine twice daily as a loading dose and then 200 mg twice daily thereafter on days 2-5. As of this writing, this study is currently underway and outcomes are expected in the upcoming weeks.
There is now a shortage of chloroquine and hydroxychloroquine in patients who have severe dermatologic and rheumatologic diseases, which include some who been in remission for years because of these medications and are in grave danger of recurrence. During this crisis, we desperately need well-controlled, randomized studies to test the efficacy and prolonged safety profile of these drugs in COVID-19 patients, as well as appropriate funding to source these medications for hospitalized and nonhospitalized patients in need.
Dr. Wesley and Dr. Talakoub are cocontributors to this column. Dr. Wesley practices dermatology in Beverly Hills, Calif. Dr. Talakoub is in private practice in McLean, Va. This month’s column is by Dr. Talakoub. They had no relevant disclosures. Write to them at dermnews@mdedge.com.
Sources
Liu J et al. Cell Discov. 2020 Mar 18. doi: 10.1038/s41421-020-0156-0.
Vincent MJ et al. Virol J. 2005 Aug 22;2:69.
Gautret P et al. Int J Antimicrob Agents. 2020 Mar 20. doi: 10.1016/j.ijantimicag.2020.105949.
Devaux CA et al. Int J Antimicrob Agents. 2020 Mar 12:105938. doi: 10.1016/j.ijantimicag.2020.105938.
Aronson J et al. COVID-19 trials registered up to 8 March 2020 – an analysis of 382 studies. 2020. Centre for Evidence-Based Medicine. https://www.cebm.net/oxford-covid-19/covid-19-registered-trials-and-analysis/
Savarino A et al. Lancet Infect Dis. 2003 Nov;3(11):722-7.
Yazdany J, Kim AHJ. Ann Intern Med. 2020 Mar 31. doi: 10.7326/M20-1334.
Xue J et al. PLoS One. 2014 Oct 1;9(10):e109180.
te Velthuis AJ et al. PLoS Pathog. 2010 Nov 4;6(11):e1001176.
Two of the most unusual dermatologic drugs have resurged as possible first-line therapy for rescue treatment of hospitalized patients with SARS-CoV-2, despite extremely limited clinical data supporting their efficacy, optimal dose, treatment duration, and potential adverse effects.
Chloroquine and hydroxychloroquine were introduced as treatment and prophylaxis of malaria and approved by the Food and Drug Administration in 1949 and 1955, respectively. They belong to a class of drugs called 4-aminoquinolones and have a flat aromatic core and a basic side chain. The basic property of these drugs contribute to their ability to accumulate in lysosomes. They have a large volume of distribution in the blood and a half-life of 40-60 days. Important interactions include use with tamoxifen, proton pump inhibitors, and with smoking. Although both drugs cross the placenta, they don’t have any notable effects on the fetus.
Chloroquine and hydroxychloroquine enter the cell and accumulate in the lysosomes along a pH gradient. Within the lysosome, they increase the pH, thereby stabilizing lysosomes and inhibiting eosinophil and neutrophil chemotaxis and phagocytic activity. They also inhibit complement-mediated hemolysis, reduce acute phase reactants, and prevent MHC class II–mediated auto antigen presentation. Additionally, they decrease cell-mediated immunity by decreasing the production of interleukin-1 and plasma cell synthesis. Hydroxychloroquine can also accumulate in endosomes and inhibit toll-like receptor signaling, thereby reducing the production of proinflammatory cytokines.
One of the ways SARS-CoV-2 enters cells is by up-regulating and binding to ACE2. Chloroquine/hydroxychloroquine reduce glycosylation of ACE2 and thus inhibit viral entry. Additionally, by increasing the endosomal pH, they potentially inactivate enzymes that viruses require for replication. Their lifesaving benefits, however, are thought to involve blocking the proinflammatory cytokine IL-6 and suppressing the cytokine storm thought to induce acute respiratory distress syndrome. Interestingly, chloroquine has also been shown to allow zinc ions into the cell, and zinc is a potent inhibitor of coronavirus RNA polymerase.
Side effects of chloroquine and hydroxychloroquine include GI upset, retinal toxicity with long-term use, hypoglycemia, cardiomyopathy, QT prolongation, ventricular arrhythmias, and renal and liver toxicity. Adverse effects have been observed with long-term daily doses of more than 3.5 mg/kg of chloroquine or more than 6.5 mg/kg of hydroxychloroquine. Cutaneous effects include pruritus, morbilliform rashes (in an estimated 10% of those treated) and psoriasis flares, and blue-black hyperpigmentation (in about 25%) of the shins, face, oral palate, and nails.
Initial In February 2020, the first clinical results of 100 patients treated with chloroquine were reported in a news briefing by the Chinese government. On March 20, the first clinical trial was published offering guidelines for the treatment of COVID-19 using hydroxychloroquine and azithromycin combination therapy – albeit with many limitations and reported biases in the study. Despite the poorly designed studies and inconclusive evidence, on March 28, the FDA issued an Emergency Use Authorization that allows providers to request a supply of hydroxychloroquine or chloroquine for hospitalized patients with COVID-19 who are unable to join a clinical trial.
On April 2, the first clinical trial to evaluate the safety and efficacy of hydroxychloroquine in adults hospitalized with COVID-19 began at Vanderbilt University Medical Center, Nashville, Tenn. The ORCHID trial (Outcomes Related to COVID-19 Treated With Hydroxychloroquine Among In-patients With Symptomatic Disease), funded by the National Heart, Lung, and Blood Institute. This blinded, placebo-controlled study is evaluating hydroxychloroquine treatment of hospitalized patients with COVID-19 in hopes of treating the severe complications of acute respiratory distress syndrome. Participants are randomly assigned to receive 400 mg hydroxychloroquine twice daily as a loading dose and then 200 mg twice daily thereafter on days 2-5. As of this writing, this study is currently underway and outcomes are expected in the upcoming weeks.
There is now a shortage of chloroquine and hydroxychloroquine in patients who have severe dermatologic and rheumatologic diseases, which include some who been in remission for years because of these medications and are in grave danger of recurrence. During this crisis, we desperately need well-controlled, randomized studies to test the efficacy and prolonged safety profile of these drugs in COVID-19 patients, as well as appropriate funding to source these medications for hospitalized and nonhospitalized patients in need.
Dr. Wesley and Dr. Talakoub are cocontributors to this column. Dr. Wesley practices dermatology in Beverly Hills, Calif. Dr. Talakoub is in private practice in McLean, Va. This month’s column is by Dr. Talakoub. They had no relevant disclosures. Write to them at dermnews@mdedge.com.
Sources
Liu J et al. Cell Discov. 2020 Mar 18. doi: 10.1038/s41421-020-0156-0.
Vincent MJ et al. Virol J. 2005 Aug 22;2:69.
Gautret P et al. Int J Antimicrob Agents. 2020 Mar 20. doi: 10.1016/j.ijantimicag.2020.105949.
Devaux CA et al. Int J Antimicrob Agents. 2020 Mar 12:105938. doi: 10.1016/j.ijantimicag.2020.105938.
Aronson J et al. COVID-19 trials registered up to 8 March 2020 – an analysis of 382 studies. 2020. Centre for Evidence-Based Medicine. https://www.cebm.net/oxford-covid-19/covid-19-registered-trials-and-analysis/
Savarino A et al. Lancet Infect Dis. 2003 Nov;3(11):722-7.
Yazdany J, Kim AHJ. Ann Intern Med. 2020 Mar 31. doi: 10.7326/M20-1334.
Xue J et al. PLoS One. 2014 Oct 1;9(10):e109180.
te Velthuis AJ et al. PLoS Pathog. 2010 Nov 4;6(11):e1001176.
Two of the most unusual dermatologic drugs have resurged as possible first-line therapy for rescue treatment of hospitalized patients with SARS-CoV-2, despite extremely limited clinical data supporting their efficacy, optimal dose, treatment duration, and potential adverse effects.
Chloroquine and hydroxychloroquine were introduced as treatment and prophylaxis of malaria and approved by the Food and Drug Administration in 1949 and 1955, respectively. They belong to a class of drugs called 4-aminoquinolones and have a flat aromatic core and a basic side chain. The basic property of these drugs contribute to their ability to accumulate in lysosomes. They have a large volume of distribution in the blood and a half-life of 40-60 days. Important interactions include use with tamoxifen, proton pump inhibitors, and with smoking. Although both drugs cross the placenta, they don’t have any notable effects on the fetus.
Chloroquine and hydroxychloroquine enter the cell and accumulate in the lysosomes along a pH gradient. Within the lysosome, they increase the pH, thereby stabilizing lysosomes and inhibiting eosinophil and neutrophil chemotaxis and phagocytic activity. They also inhibit complement-mediated hemolysis, reduce acute phase reactants, and prevent MHC class II–mediated auto antigen presentation. Additionally, they decrease cell-mediated immunity by decreasing the production of interleukin-1 and plasma cell synthesis. Hydroxychloroquine can also accumulate in endosomes and inhibit toll-like receptor signaling, thereby reducing the production of proinflammatory cytokines.
One of the ways SARS-CoV-2 enters cells is by up-regulating and binding to ACE2. Chloroquine/hydroxychloroquine reduce glycosylation of ACE2 and thus inhibit viral entry. Additionally, by increasing the endosomal pH, they potentially inactivate enzymes that viruses require for replication. Their lifesaving benefits, however, are thought to involve blocking the proinflammatory cytokine IL-6 and suppressing the cytokine storm thought to induce acute respiratory distress syndrome. Interestingly, chloroquine has also been shown to allow zinc ions into the cell, and zinc is a potent inhibitor of coronavirus RNA polymerase.
Side effects of chloroquine and hydroxychloroquine include GI upset, retinal toxicity with long-term use, hypoglycemia, cardiomyopathy, QT prolongation, ventricular arrhythmias, and renal and liver toxicity. Adverse effects have been observed with long-term daily doses of more than 3.5 mg/kg of chloroquine or more than 6.5 mg/kg of hydroxychloroquine. Cutaneous effects include pruritus, morbilliform rashes (in an estimated 10% of those treated) and psoriasis flares, and blue-black hyperpigmentation (in about 25%) of the shins, face, oral palate, and nails.
Initial In February 2020, the first clinical results of 100 patients treated with chloroquine were reported in a news briefing by the Chinese government. On March 20, the first clinical trial was published offering guidelines for the treatment of COVID-19 using hydroxychloroquine and azithromycin combination therapy – albeit with many limitations and reported biases in the study. Despite the poorly designed studies and inconclusive evidence, on March 28, the FDA issued an Emergency Use Authorization that allows providers to request a supply of hydroxychloroquine or chloroquine for hospitalized patients with COVID-19 who are unable to join a clinical trial.
On April 2, the first clinical trial to evaluate the safety and efficacy of hydroxychloroquine in adults hospitalized with COVID-19 began at Vanderbilt University Medical Center, Nashville, Tenn. The ORCHID trial (Outcomes Related to COVID-19 Treated With Hydroxychloroquine Among In-patients With Symptomatic Disease), funded by the National Heart, Lung, and Blood Institute. This blinded, placebo-controlled study is evaluating hydroxychloroquine treatment of hospitalized patients with COVID-19 in hopes of treating the severe complications of acute respiratory distress syndrome. Participants are randomly assigned to receive 400 mg hydroxychloroquine twice daily as a loading dose and then 200 mg twice daily thereafter on days 2-5. As of this writing, this study is currently underway and outcomes are expected in the upcoming weeks.
There is now a shortage of chloroquine and hydroxychloroquine in patients who have severe dermatologic and rheumatologic diseases, which include some who been in remission for years because of these medications and are in grave danger of recurrence. During this crisis, we desperately need well-controlled, randomized studies to test the efficacy and prolonged safety profile of these drugs in COVID-19 patients, as well as appropriate funding to source these medications for hospitalized and nonhospitalized patients in need.
Dr. Wesley and Dr. Talakoub are cocontributors to this column. Dr. Wesley practices dermatology in Beverly Hills, Calif. Dr. Talakoub is in private practice in McLean, Va. This month’s column is by Dr. Talakoub. They had no relevant disclosures. Write to them at dermnews@mdedge.com.
Sources
Liu J et al. Cell Discov. 2020 Mar 18. doi: 10.1038/s41421-020-0156-0.
Vincent MJ et al. Virol J. 2005 Aug 22;2:69.
Gautret P et al. Int J Antimicrob Agents. 2020 Mar 20. doi: 10.1016/j.ijantimicag.2020.105949.
Devaux CA et al. Int J Antimicrob Agents. 2020 Mar 12:105938. doi: 10.1016/j.ijantimicag.2020.105938.
Aronson J et al. COVID-19 trials registered up to 8 March 2020 – an analysis of 382 studies. 2020. Centre for Evidence-Based Medicine. https://www.cebm.net/oxford-covid-19/covid-19-registered-trials-and-analysis/
Savarino A et al. Lancet Infect Dis. 2003 Nov;3(11):722-7.
Yazdany J, Kim AHJ. Ann Intern Med. 2020 Mar 31. doi: 10.7326/M20-1334.
Xue J et al. PLoS One. 2014 Oct 1;9(10):e109180.
te Velthuis AJ et al. PLoS Pathog. 2010 Nov 4;6(11):e1001176.