Expert Commentary

Rives-Lange C, Poghosyan T, Phan A, et al. Risk-benefit balance associated with obstetric, neonatal, and child outcomes after metabolic and bariatric surgery. JAMA Surg. 2023;158:36-44. doi:10.1001/jamasurg.2022.5450.

EXPERT COMMENTARY

Prepregnancy obesity continues to rise, with approximately 40% of reproductive-aged patients having a body mass index greater than 30 kg/m².¹ Several adverse perinatal outcomes are more common in pregnant patients with obesity.² In addition, their infants have a higher risk of obesity, insulin resistance, hypertension, and neurodevelopmental disorders in the long term.^3,4

Bariatric surgery is an effective procedure for weight loss and has been shown to lower adverse pregnancy outcomes, such as hypertensive disorders of pregnancy and gestational diabetes.^5,6 Benefits to newborns, however, have been debated.⁵ In addition, long-term benefits to infants were unknown until a recent study evaluated neonatal and child outcomes up to 2 years after pregnancy among patients who had undergone bariatric surgery.

Details of the study

Using the French nationwide database, Rives-Lange and colleagues performed a population-based study that included patients who had at least 1 pregnancy before and 1 pregnancy after bariatric surgery. Their objective was to compare pregnancy, neonatal, and child outcomes between pregnancies pre- and post-bariatric surgery.

Results. Among 3,686 patients who had at least 1 pregnancy before and after bariatric surgery, the authors found that pregnancies after bariatric surgery had lower rates of several adverse pregnancy outcomes, including preeclampsia (OR, 0.19), gestational hypertension (OR, 0.16), and gestational diabetes (OR, 0.39), compared with pregnancies before bariatric surgery. Regarding neonatal and child outcomes up to 2 years after pregnancy, there were lower rates of birth injuries (OR, 0.27), convulsions (OR, 0.43), newborn carbohydrate metabolism disorders (OR, 0.54),and viral intestinal infections (OR, 0.56) in pregnancies after bariatric surgery compared with those before surgery.

Notably, respiratory failure rates associated with bronchiolitis increased in pregnancies after bariatric surgery (OR, 2.42). This finding remained associated after adjusting for prematurity and small for gestational age as well as including 2 successive pregnancies before bariatric surgery (OR, 1.37).

Study strengths and limitations

A limitation of this study is the use of an administrative database, which may be biased and missing relevant variables. However, the study’s major strength was the large sample of patients serving as their own control to compare outcomes from pre-bariatric surgery with those of post-bariatric surgery. In addition, to account for confounders such as age and parity, the authors also evaluated for associations between 2 consecutive pregnancies among patients before bariatric surgery. They did not consider diagnoses found to be associated with bariatric surgery if they were also significant in the analysis between 2 consecutive pregnancies before bariatric surgery.

The finding of increased risk of respiratory failure from bronchiolitis after bariatric surgery is surprising given that obesity is a risk factor for the severity of bronchiolitis.⁷ Although this risk remained significant after including the analysis that used 2 consecutive pregnancies pre-bariatric surgery, the risk was lower (from an OR of 2.42 to an OR of 1.37). Thus, more data are required to confirm this potential risk. Despite this concerning finding, the overwhelming pregnancy, neonatal, and child benefits found and confirmed in this large, well-designed study support the continued practice of counseling on the benefits of bariatric surgery to our obese patients. ●

Rives-Lange C, Poghosyan T, Phan A, et al. Risk-benefit balance associated with obstetric, neonatal, and child outcomes after metabolic and bariatric surgery. JAMA Surg. 2023;158:36-44. doi:10.1001/jamasurg.2022.5450.

EXPERT COMMENTARY

Prepregnancy obesity continues to rise, with approximately 40% of reproductive-aged patients having a body mass index greater than 30 kg/m².¹ Several adverse perinatal outcomes are more common in pregnant patients with obesity.² In addition, their infants have a higher risk of obesity, insulin resistance, hypertension, and neurodevelopmental disorders in the long term.^3,4

Bariatric surgery is an effective procedure for weight loss and has been shown to lower adverse pregnancy outcomes, such as hypertensive disorders of pregnancy and gestational diabetes.^5,6 Benefits to newborns, however, have been debated.⁵ In addition, long-term benefits to infants were unknown until a recent study evaluated neonatal and child outcomes up to 2 years after pregnancy among patients who had undergone bariatric surgery.

Details of the study

Using the French nationwide database, Rives-Lange and colleagues performed a population-based study that included patients who had at least 1 pregnancy before and 1 pregnancy after bariatric surgery. Their objective was to compare pregnancy, neonatal, and child outcomes between pregnancies pre- and post-bariatric surgery.

Results. Among 3,686 patients who had at least 1 pregnancy before and after bariatric surgery, the authors found that pregnancies after bariatric surgery had lower rates of several adverse pregnancy outcomes, including preeclampsia (OR, 0.19), gestational hypertension (OR, 0.16), and gestational diabetes (OR, 0.39), compared with pregnancies before bariatric surgery. Regarding neonatal and child outcomes up to 2 years after pregnancy, there were lower rates of birth injuries (OR, 0.27), convulsions (OR, 0.43), newborn carbohydrate metabolism disorders (OR, 0.54),and viral intestinal infections (OR, 0.56) in pregnancies after bariatric surgery compared with those before surgery.

Notably, respiratory failure rates associated with bronchiolitis increased in pregnancies after bariatric surgery (OR, 2.42). This finding remained associated after adjusting for prematurity and small for gestational age as well as including 2 successive pregnancies before bariatric surgery (OR, 1.37).

Study strengths and limitations

A limitation of this study is the use of an administrative database, which may be biased and missing relevant variables. However, the study’s major strength was the large sample of patients serving as their own control to compare outcomes from pre-bariatric surgery with those of post-bariatric surgery. In addition, to account for confounders such as age and parity, the authors also evaluated for associations between 2 consecutive pregnancies among patients before bariatric surgery. They did not consider diagnoses found to be associated with bariatric surgery if they were also significant in the analysis between 2 consecutive pregnancies before bariatric surgery.

The finding of increased risk of respiratory failure from bronchiolitis after bariatric surgery is surprising given that obesity is a risk factor for the severity of bronchiolitis.⁷ Although this risk remained significant after including the analysis that used 2 consecutive pregnancies pre-bariatric surgery, the risk was lower (from an OR of 2.42 to an OR of 1.37). Thus, more data are required to confirm this potential risk. Despite this concerning finding, the overwhelming pregnancy, neonatal, and child benefits found and confirmed in this large, well-designed study support the continued practice of counseling on the benefits of bariatric surgery to our obese patients. ●

Rives-Lange C, Poghosyan T, Phan A, et al. Risk-benefit balance associated with obstetric, neonatal, and child outcomes after metabolic and bariatric surgery. JAMA Surg. 2023;158:36-44. doi:10.1001/jamasurg.2022.5450.

EXPERT COMMENTARY

Prepregnancy obesity continues to rise, with approximately 40% of reproductive-aged patients having a body mass index greater than 30 kg/m².¹ Several adverse perinatal outcomes are more common in pregnant patients with obesity.² In addition, their infants have a higher risk of obesity, insulin resistance, hypertension, and neurodevelopmental disorders in the long term.^3,4

Bariatric surgery is an effective procedure for weight loss and has been shown to lower adverse pregnancy outcomes, such as hypertensive disorders of pregnancy and gestational diabetes.^5,6 Benefits to newborns, however, have been debated.⁵ In addition, long-term benefits to infants were unknown until a recent study evaluated neonatal and child outcomes up to 2 years after pregnancy among patients who had undergone bariatric surgery.

Details of the study

Using the French nationwide database, Rives-Lange and colleagues performed a population-based study that included patients who had at least 1 pregnancy before and 1 pregnancy after bariatric surgery. Their objective was to compare pregnancy, neonatal, and child outcomes between pregnancies pre- and post-bariatric surgery.

Results. Among 3,686 patients who had at least 1 pregnancy before and after bariatric surgery, the authors found that pregnancies after bariatric surgery had lower rates of several adverse pregnancy outcomes, including preeclampsia (OR, 0.19), gestational hypertension (OR, 0.16), and gestational diabetes (OR, 0.39), compared with pregnancies before bariatric surgery. Regarding neonatal and child outcomes up to 2 years after pregnancy, there were lower rates of birth injuries (OR, 0.27), convulsions (OR, 0.43), newborn carbohydrate metabolism disorders (OR, 0.54),and viral intestinal infections (OR, 0.56) in pregnancies after bariatric surgery compared with those before surgery.

Notably, respiratory failure rates associated with bronchiolitis increased in pregnancies after bariatric surgery (OR, 2.42). This finding remained associated after adjusting for prematurity and small for gestational age as well as including 2 successive pregnancies before bariatric surgery (OR, 1.37).

Study strengths and limitations

A limitation of this study is the use of an administrative database, which may be biased and missing relevant variables. However, the study’s major strength was the large sample of patients serving as their own control to compare outcomes from pre-bariatric surgery with those of post-bariatric surgery. In addition, to account for confounders such as age and parity, the authors also evaluated for associations between 2 consecutive pregnancies among patients before bariatric surgery. They did not consider diagnoses found to be associated with bariatric surgery if they were also significant in the analysis between 2 consecutive pregnancies before bariatric surgery.

The finding of increased risk of respiratory failure from bronchiolitis after bariatric surgery is surprising given that obesity is a risk factor for the severity of bronchiolitis.⁷ Although this risk remained significant after including the analysis that used 2 consecutive pregnancies pre-bariatric surgery, the risk was lower (from an OR of 2.42 to an OR of 1.37). Thus, more data are required to confirm this potential risk. Despite this concerning finding, the overwhelming pregnancy, neonatal, and child benefits found and confirmed in this large, well-designed study support the continued practice of counseling on the benefits of bariatric surgery to our obese patients. ●

Prior to 1993, a multiple sclerosis (MS) diagnosis could often mean an abbreviated lifespan marked by progressive disability and loss of function. That changed when the Food and Drug Administration approved interferon beta-1b (Betaseron) in 1993, which revolutionized MS therapy and gave hope to the entire MS community.

"The most surprising thing about MS management over the last 30 years is that we’ve been able to treat MS – especially relapsing MS,” said Fred D. Lublin, MD, professor of neurology and director of the Corinne Goldsmith Dickinson Center for Multiple Sclerosis in Mount Sinai in New York. “The approval of interferon was a major therapeutic advancement because it was the first treatment for what was an untreatable disease.”

Mark Gudesblatt, MD, medical director of the Comprehensive MS Care Center of South Shore Neurologic Associates in Patchogue, N.Y., agrees.

“For people with MS, it’s an extraordinarily lucky and amazingly optimistic time,” he said. “Before interferon beta-1b, MS was called ‘the crippler of young adults’ because more than 50% of these people would require a walker 10 years after diagnosis, and a large number of young and middle-age patients with MS were residing in nursing homes.”

Treatment options, treatment challenges

Dr. Gudesblatt points out that having numerous therapies from which to choose is both a blessing and a problem.

“The good news is that there are so many options for treating relapsing MS today,” he said. “The bad news is there are so many options. Like doctors who are treating high blood pressure, doctors managing patients with MS often struggle to determine which medication is best for individual patients.”

Despite the promise of vastly better outcomes and prolonged lifespan, MS therapy still faces its share of challenges, including effective therapies for progressive MS and reparative-restorative therapies.

“Choice in route of administration and timing of administration allow for larger and broader discussions to try to meet patients’ needs,” Dr. Lublin said. “We’ve been extremely successful at treating relapses, but not as successful in treating progressive disease.”

The unclear mechanism of pathogenesis amplifies the challenges clinicians face in successful management of patients with MS. For example, experts agree that the therapies for progressive MS have only proven moderately effective at best. The paucity of therapies available for progressive MS and the limitations of the current therapies further limit the outcomes.
 

Looking ahead

Experts expressed optimistic views about the future of MS therapy as a whole. From Dr. Lublin’s perspective, the MS community stands to gain valuable insights from emerging research focused on treating progressive disease along with new testing to understand the underlying mechanism of progressive disease. Enhanced understanding of the underlying pathogenesis of progressive MS coupled with the ability to diagnose MS – such as improved MRI techniques – have facilitated this process.

Among the therapies with novel mechanisms of action in the pipeline include agents that generate myelin sheath repair. Another potential therapeutic class on the horizon, known as TPK inhibitors, addresses the smoldering of the disease. With these and other therapeutic advances, Dr. Lublin hopes to see better control of progressive disease.
 

An agenda for the future

In addition, barriers such as access to care, cost, insurance coverage, and tolerance remain ongoing stressors that will likely continue weighing on the MS community and its stakeholders into the future.

Dr. Gudesblatt concluded that advancing MS outcomes in the future hinges on several additional factors.

“We need medicines that are better for relapse and progression; medicines that are better tolerated and safer; and better medicine to address the underlying disease as well as its symptoms. But we also need to appreciate, recognize, and address cognitive impairment along the MS continuum and develop effective reparative options,” he said.

Regardless, he emphasized that these “amazing advancements” in MS therapy have renewed hope that research may identify and expand effective treatments for multiple other neurologic conditions such as muscular dystrophies, neurodegenerative and genetic disorders, movement disorders, and dysautonomia-related diseases. Like MS, all of these conditions have limited therapies, some of which have minimal efficacy. But none of these other disorders has disease-modifying therapies currently available.
 

‘A beacon of hope’

“MS is the beacon of hope for multiple disease states because it’s cracked the door wide open,” Dr. Gudesblatt said. Relapse no longer gauges the prognosis of today’s MS patient – a prognosis both experts think will only continue to improve with forthcoming innovations.

While the challenges for MS still exist, the bright future that lies ahead may eventually eclipse them.

Prior to 1993, a multiple sclerosis (MS) diagnosis could often mean an abbreviated lifespan marked by progressive disability and loss of function. That changed when the Food and Drug Administration approved interferon beta-1b (Betaseron) in 1993, which revolutionized MS therapy and gave hope to the entire MS community.

"The most surprising thing about MS management over the last 30 years is that we’ve been able to treat MS – especially relapsing MS,” said Fred D. Lublin, MD, professor of neurology and director of the Corinne Goldsmith Dickinson Center for Multiple Sclerosis in Mount Sinai in New York. “The approval of interferon was a major therapeutic advancement because it was the first treatment for what was an untreatable disease.”

Mark Gudesblatt, MD, medical director of the Comprehensive MS Care Center of South Shore Neurologic Associates in Patchogue, N.Y., agrees.

“For people with MS, it’s an extraordinarily lucky and amazingly optimistic time,” he said. “Before interferon beta-1b, MS was called ‘the crippler of young adults’ because more than 50% of these people would require a walker 10 years after diagnosis, and a large number of young and middle-age patients with MS were residing in nursing homes.”

Treatment options, treatment challenges

Dr. Gudesblatt points out that having numerous therapies from which to choose is both a blessing and a problem.

“The good news is that there are so many options for treating relapsing MS today,” he said. “The bad news is there are so many options. Like doctors who are treating high blood pressure, doctors managing patients with MS often struggle to determine which medication is best for individual patients.”

Despite the promise of vastly better outcomes and prolonged lifespan, MS therapy still faces its share of challenges, including effective therapies for progressive MS and reparative-restorative therapies.

“Choice in route of administration and timing of administration allow for larger and broader discussions to try to meet patients’ needs,” Dr. Lublin said. “We’ve been extremely successful at treating relapses, but not as successful in treating progressive disease.”

The unclear mechanism of pathogenesis amplifies the challenges clinicians face in successful management of patients with MS. For example, experts agree that the therapies for progressive MS have only proven moderately effective at best. The paucity of therapies available for progressive MS and the limitations of the current therapies further limit the outcomes.
 

Looking ahead

Experts expressed optimistic views about the future of MS therapy as a whole. From Dr. Lublin’s perspective, the MS community stands to gain valuable insights from emerging research focused on treating progressive disease along with new testing to understand the underlying mechanism of progressive disease. Enhanced understanding of the underlying pathogenesis of progressive MS coupled with the ability to diagnose MS – such as improved MRI techniques – have facilitated this process.

Among the therapies with novel mechanisms of action in the pipeline include agents that generate myelin sheath repair. Another potential therapeutic class on the horizon, known as TPK inhibitors, addresses the smoldering of the disease. With these and other therapeutic advances, Dr. Lublin hopes to see better control of progressive disease.
 

An agenda for the future

In addition, barriers such as access to care, cost, insurance coverage, and tolerance remain ongoing stressors that will likely continue weighing on the MS community and its stakeholders into the future.

Dr. Gudesblatt concluded that advancing MS outcomes in the future hinges on several additional factors.

“We need medicines that are better for relapse and progression; medicines that are better tolerated and safer; and better medicine to address the underlying disease as well as its symptoms. But we also need to appreciate, recognize, and address cognitive impairment along the MS continuum and develop effective reparative options,” he said.

Regardless, he emphasized that these “amazing advancements” in MS therapy have renewed hope that research may identify and expand effective treatments for multiple other neurologic conditions such as muscular dystrophies, neurodegenerative and genetic disorders, movement disorders, and dysautonomia-related diseases. Like MS, all of these conditions have limited therapies, some of which have minimal efficacy. But none of these other disorders has disease-modifying therapies currently available.
 

‘A beacon of hope’

“MS is the beacon of hope for multiple disease states because it’s cracked the door wide open,” Dr. Gudesblatt said. Relapse no longer gauges the prognosis of today’s MS patient – a prognosis both experts think will only continue to improve with forthcoming innovations.

While the challenges for MS still exist, the bright future that lies ahead may eventually eclipse them.

Prior to 1993, a multiple sclerosis (MS) diagnosis could often mean an abbreviated lifespan marked by progressive disability and loss of function. That changed when the Food and Drug Administration approved interferon beta-1b (Betaseron) in 1993, which revolutionized MS therapy and gave hope to the entire MS community.

"The most surprising thing about MS management over the last 30 years is that we’ve been able to treat MS – especially relapsing MS,” said Fred D. Lublin, MD, professor of neurology and director of the Corinne Goldsmith Dickinson Center for Multiple Sclerosis in Mount Sinai in New York. “The approval of interferon was a major therapeutic advancement because it was the first treatment for what was an untreatable disease.”

Mark Gudesblatt, MD, medical director of the Comprehensive MS Care Center of South Shore Neurologic Associates in Patchogue, N.Y., agrees.

“For people with MS, it’s an extraordinarily lucky and amazingly optimistic time,” he said. “Before interferon beta-1b, MS was called ‘the crippler of young adults’ because more than 50% of these people would require a walker 10 years after diagnosis, and a large number of young and middle-age patients with MS were residing in nursing homes.”

Treatment options, treatment challenges

Dr. Gudesblatt points out that having numerous therapies from which to choose is both a blessing and a problem.

“The good news is that there are so many options for treating relapsing MS today,” he said. “The bad news is there are so many options. Like doctors who are treating high blood pressure, doctors managing patients with MS often struggle to determine which medication is best for individual patients.”

Despite the promise of vastly better outcomes and prolonged lifespan, MS therapy still faces its share of challenges, including effective therapies for progressive MS and reparative-restorative therapies.

“Choice in route of administration and timing of administration allow for larger and broader discussions to try to meet patients’ needs,” Dr. Lublin said. “We’ve been extremely successful at treating relapses, but not as successful in treating progressive disease.”

The unclear mechanism of pathogenesis amplifies the challenges clinicians face in successful management of patients with MS. For example, experts agree that the therapies for progressive MS have only proven moderately effective at best. The paucity of therapies available for progressive MS and the limitations of the current therapies further limit the outcomes.
 

Looking ahead

Experts expressed optimistic views about the future of MS therapy as a whole. From Dr. Lublin’s perspective, the MS community stands to gain valuable insights from emerging research focused on treating progressive disease along with new testing to understand the underlying mechanism of progressive disease. Enhanced understanding of the underlying pathogenesis of progressive MS coupled with the ability to diagnose MS – such as improved MRI techniques – have facilitated this process.

Among the therapies with novel mechanisms of action in the pipeline include agents that generate myelin sheath repair. Another potential therapeutic class on the horizon, known as TPK inhibitors, addresses the smoldering of the disease. With these and other therapeutic advances, Dr. Lublin hopes to see better control of progressive disease.
 

An agenda for the future

In addition, barriers such as access to care, cost, insurance coverage, and tolerance remain ongoing stressors that will likely continue weighing on the MS community and its stakeholders into the future.

Dr. Gudesblatt concluded that advancing MS outcomes in the future hinges on several additional factors.

“We need medicines that are better for relapse and progression; medicines that are better tolerated and safer; and better medicine to address the underlying disease as well as its symptoms. But we also need to appreciate, recognize, and address cognitive impairment along the MS continuum and develop effective reparative options,” he said.

Regardless, he emphasized that these “amazing advancements” in MS therapy have renewed hope that research may identify and expand effective treatments for multiple other neurologic conditions such as muscular dystrophies, neurodegenerative and genetic disorders, movement disorders, and dysautonomia-related diseases. Like MS, all of these conditions have limited therapies, some of which have minimal efficacy. But none of these other disorders has disease-modifying therapies currently available.
 

‘A beacon of hope’

“MS is the beacon of hope for multiple disease states because it’s cracked the door wide open,” Dr. Gudesblatt said. Relapse no longer gauges the prognosis of today’s MS patient – a prognosis both experts think will only continue to improve with forthcoming innovations.

While the challenges for MS still exist, the bright future that lies ahead may eventually eclipse them.

Thadhani R, Lemoine E, Rana S, et al. Circulating angiogenic factor levels in hypertensive disorders of pregnancy. N Engl J Med. 2022;1. DOI: 10.1056/EVIDoa2200161

EXPERT COMMENTARY
 

The standard core lecture on preeclampsia given to all medical students frequently begins with an epic, if not potentially apocryphal, statement regarding how this disease has been noted in the annals of medical history since the time of the Ancients. Although contemporary diagnostic criteria for preeclampsia are not that far out of date, they are close. The increased urinary protein loss and hypertension preceding eclamptic seizures was first noted at the end of the 19th century. The blood pressure and proteinuria criteria used for diagnosis was codified in its contemporary form in the late 1940s. Since then, “tweak” rather than “overhaul” probably best describes the updates of the obstetrical community to the definition of preeclampsia. This has just changed.

Details of the study

Thadhani and colleagues prospectively recruited a nationally representative observational cohort of patients hospitalized for hypertension during pregnancy, then followed the patients until either the diagnosis of preeclampsia with severe features or for 2 weeks, whichever came first. At enrollment, circulating levels of the soluble fms-like tyrosine kinase 1 (sFlt-1) and placental growth factor (PlGF) were measured. In a 2-phased design, the first 219 participants were used to define a sFlt-1/PlGF ratio that would predict progression to severe preeclampsia within 2 weeks. The next 556 enrollees served to validate the predictive properties of the ratio. The authors found that a sFlt-1/PlGF ratio of ≥40 predicted progression to preeclampsia with severe features with an area under the curve (AUC) of 0.92.

As products of the trophoblasts, both sFlt-1 and PlGF have been mooted for almost 2 decades as potential predictive, if not diagnostic, aids with respect to preeclampsia. Indeed, both analytes are commercially available in Europe for specifically this purpose and many maternal-fetal medicine practitioners working in the European equivalent American tertiary referral centers use an sFlt-1/PlGF ratio as their primary criteria for a diagnosis of preeclampsia. Within the United States, there was an initial flurry of interest in and an infusion of corporate and federal research support for sFlt-1 and PlGF as diagnostic aids for preeclampsia in the mid-2000s. However, at present, the US Food and Drug Administration (FDA) has not sanctioned these (or any) biomarkers to aid in the diagnosis of preeclampsia. As Thermo-Fisher Scientific (Waltham, Massachusetts) is a supporting partner in this study, it is almost certain that these data will be submitted for review by the FDA as part of an application for a preeclampsia diagnostic. At some point in the near future, American practitioners will potentially be able to join their European colleagues in utilizing these biomarkers in the diagnosis of preeclampsia with severe features. ●

Thadhani R, Lemoine E, Rana S, et al. Circulating angiogenic factor levels in hypertensive disorders of pregnancy. N Engl J Med. 2022;1. DOI: 10.1056/EVIDoa2200161

EXPERT COMMENTARY
 

The standard core lecture on preeclampsia given to all medical students frequently begins with an epic, if not potentially apocryphal, statement regarding how this disease has been noted in the annals of medical history since the time of the Ancients. Although contemporary diagnostic criteria for preeclampsia are not that far out of date, they are close. The increased urinary protein loss and hypertension preceding eclamptic seizures was first noted at the end of the 19th century. The blood pressure and proteinuria criteria used for diagnosis was codified in its contemporary form in the late 1940s. Since then, “tweak” rather than “overhaul” probably best describes the updates of the obstetrical community to the definition of preeclampsia. This has just changed.

Details of the study

Thadhani and colleagues prospectively recruited a nationally representative observational cohort of patients hospitalized for hypertension during pregnancy, then followed the patients until either the diagnosis of preeclampsia with severe features or for 2 weeks, whichever came first. At enrollment, circulating levels of the soluble fms-like tyrosine kinase 1 (sFlt-1) and placental growth factor (PlGF) were measured. In a 2-phased design, the first 219 participants were used to define a sFlt-1/PlGF ratio that would predict progression to severe preeclampsia within 2 weeks. The next 556 enrollees served to validate the predictive properties of the ratio. The authors found that a sFlt-1/PlGF ratio of ≥40 predicted progression to preeclampsia with severe features with an area under the curve (AUC) of 0.92.

As products of the trophoblasts, both sFlt-1 and PlGF have been mooted for almost 2 decades as potential predictive, if not diagnostic, aids with respect to preeclampsia. Indeed, both analytes are commercially available in Europe for specifically this purpose and many maternal-fetal medicine practitioners working in the European equivalent American tertiary referral centers use an sFlt-1/PlGF ratio as their primary criteria for a diagnosis of preeclampsia. Within the United States, there was an initial flurry of interest in and an infusion of corporate and federal research support for sFlt-1 and PlGF as diagnostic aids for preeclampsia in the mid-2000s. However, at present, the US Food and Drug Administration (FDA) has not sanctioned these (or any) biomarkers to aid in the diagnosis of preeclampsia. As Thermo-Fisher Scientific (Waltham, Massachusetts) is a supporting partner in this study, it is almost certain that these data will be submitted for review by the FDA as part of an application for a preeclampsia diagnostic. At some point in the near future, American practitioners will potentially be able to join their European colleagues in utilizing these biomarkers in the diagnosis of preeclampsia with severe features. ●

Thadhani R, Lemoine E, Rana S, et al. Circulating angiogenic factor levels in hypertensive disorders of pregnancy. N Engl J Med. 2022;1. DOI: 10.1056/EVIDoa2200161

EXPERT COMMENTARY
 

The standard core lecture on preeclampsia given to all medical students frequently begins with an epic, if not potentially apocryphal, statement regarding how this disease has been noted in the annals of medical history since the time of the Ancients. Although contemporary diagnostic criteria for preeclampsia are not that far out of date, they are close. The increased urinary protein loss and hypertension preceding eclamptic seizures was first noted at the end of the 19th century. The blood pressure and proteinuria criteria used for diagnosis was codified in its contemporary form in the late 1940s. Since then, “tweak” rather than “overhaul” probably best describes the updates of the obstetrical community to the definition of preeclampsia. This has just changed.

Details of the study

Thadhani and colleagues prospectively recruited a nationally representative observational cohort of patients hospitalized for hypertension during pregnancy, then followed the patients until either the diagnosis of preeclampsia with severe features or for 2 weeks, whichever came first. At enrollment, circulating levels of the soluble fms-like tyrosine kinase 1 (sFlt-1) and placental growth factor (PlGF) were measured. In a 2-phased design, the first 219 participants were used to define a sFlt-1/PlGF ratio that would predict progression to severe preeclampsia within 2 weeks. The next 556 enrollees served to validate the predictive properties of the ratio. The authors found that a sFlt-1/PlGF ratio of ≥40 predicted progression to preeclampsia with severe features with an area under the curve (AUC) of 0.92.

As products of the trophoblasts, both sFlt-1 and PlGF have been mooted for almost 2 decades as potential predictive, if not diagnostic, aids with respect to preeclampsia. Indeed, both analytes are commercially available in Europe for specifically this purpose and many maternal-fetal medicine practitioners working in the European equivalent American tertiary referral centers use an sFlt-1/PlGF ratio as their primary criteria for a diagnosis of preeclampsia. Within the United States, there was an initial flurry of interest in and an infusion of corporate and federal research support for sFlt-1 and PlGF as diagnostic aids for preeclampsia in the mid-2000s. However, at present, the US Food and Drug Administration (FDA) has not sanctioned these (or any) biomarkers to aid in the diagnosis of preeclampsia. As Thermo-Fisher Scientific (Waltham, Massachusetts) is a supporting partner in this study, it is almost certain that these data will be submitted for review by the FDA as part of an application for a preeclampsia diagnostic. At some point in the near future, American practitioners will potentially be able to join their European colleagues in utilizing these biomarkers in the diagnosis of preeclampsia with severe features. ●

Chawla S, Wyckoff MH, Rysavy MA, et al; Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network. Association of antenatal steroid exposure at 21 to 22 weeks of gestation with neonatal survival and survival without morbidities. JAMA Netw Open. 2022;5:e2233331. doi:10.1001/jamanet workopen.2022.33331.

EXPERT COMMENTARY

The single most important intervention available in obstetrics to improve the health outcomes of preterm newborns is the maternal administration of corticosteroids. The 27 randomized controlled trials that formed the basis for this knowledge¹ did not include infants delivered at 24 weeks’ gestation or less. This has not dissuaded us, over the last several decades, from using corticosteroids for impending delivery at 24 weeks’ gestation; in the absence of randomized data, this has been based on observational evidence of benefit.

Following the 2011 publication of a retrospective cohort study that analyzed data collected by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Neonatal Research Network between 1993 and 2009 (the Carlo study),² ACS started to be used widely even for impending delivery at 23 weeks’ gestation. That study had found that the odds of death and neurodevelopmental impairment at 18 to 22 months of age were significantly lower in cases that received ACS and were born at 23 weeks (n = 1,978). The same benefit could not be verified for infants born at 22 weeks’ gestational age (n = 402).

In a recent study conducted by the same NICHD Neonatal Research Network, antenatal steroid exposure at 21 to 22 weeks of gestation was examined.

ILLUSTRATION: KIMBERLY MARTENS FOR OBG MANAGEMENT

Details of the study

Using prospectively collected data from 2016 to 2019, Chawla and colleagues conducted a retrospective cohort study that analyzed data from 431 infants who were born between 22 0/7 and 23 6/7 weeks’ gestation and received neonatal intensive care (179 infants born at 22 weeks’ gestation).³ The infants not exposed to ACS were compared with those who had partial exposure (only 1 dose) and those with complete ACS exposure (2 doses).

Complete ACS exposure proved to be beneficial, increasing survival to discharge from 35.5% in the no-exposure group to 53.9% (adjusted odds ratio [aOR], 1.95; 95% confidence interval [CI], 1.07–3.56). Of the survivors, 26.9% in the complete-exposure group had no major morbidities compared with 10% in the no-exposure group (aOR, 2.74; 95% CI, 1.19–6.30).

Study strengths and limitations

The strengths of this study include the use of a diverse, multicenter cohort, with contemporary delivery data, which increases the generalizability of the findings. The analysis included aspects often overlooked in other similar studies, such as the dose of ACS exposure and the gestational age at the time of exposure.

The observational study design, however, can suggest only associations rather than causal relationships. Observational studies also are apt to be affected by residual confounding. Such limitations can only be overcome by a randomized controlled trial, but such a trial of ACS at periviable gestational ages seems unfeasible due to limited ethical justification.

Another limitation is the reporting on outcomes as a collective group (22–23 weeks’ gestation). It is important to consider each gestational age week separately due to differences in physiology and potential biological limitations. It cannot be assumed that 22 weeks behaves like 23 weeks, just as 21 weeks is not equivalent to 22 weeks.

The study results suggest that the protective effect of ACS was dose dependent. However, the interpretation that only a complete ACS exposure was beneficial should be viewed cautiously because the study had no power to assess the impact of a partial exposure.

A further limitation is the lack of consideration in analysis for maternal comorbidities and fetal growth restriction. In the Carlo study, the beneficial effect of corticosteroids in 23-week gestational age deliveries was not demonstrable in pregnancies affected by fetal growth restriction or maternal hypertension.

Other studies considered

Given all its limitations, can we assume that the study by Chawla and colleagues has reliably refuted the Carlo study’s suggestion of lack of ACS efficacy in infants born at 22 weeks’ gestation? Taken by itself, probably not. In the context of other recent investigations, yes.

A retrospective registry study that used data from the Vermont Oxford Network for the period 2012–2016 on 1,058 infants born at 22 weeks’ gestation found that infants who were exposed to ACS and received postnatal life support were more likely to survive to hospital discharge without major morbidity compared with infants who received postnatal life support alone.⁴ Overall survival was 38.5% versus 17.7% (adjusted risk ratio [aRR], 2.11; 95% CI, 1.68–2.65), and survival without major morbidity was 4.4% versus 1.0% (aRR, 4.35; 95% CI, 1.84–10.28).

An even larger cohort study that used data from the National Center for Health Statistics concluded that survival at age 1 year for infants born at 22 weeks (n = 2,635) during 2009–2014 was improved in those exposed to ACS followed by postnatal life support compared with postnatal life support alone (45.2% vs 27.8%; aRR, 1.6; 95% CI, 1.2–2.1).⁵

A meta-analysis of observational studies that reported on infants born between 22 0/7 and 22 6/7 weeks’ gestation (n = 2,226) who received proactive neonatal treatment found that administration of ACS doubled the rate of survival when compared with no ACS administration (39% vs 19.5%; P<.01).⁶

In September 2021, the recommendations from the American College of Obstetricians and Gynecologists changed, stating that ACS can be considered at 22 weeks’ gestation when active postnatal management is desired.⁷ This recommendation is largely congruent with those from several other national and international medical organizations, including the World Association of Perinatal Medicine, the Royal Collegeof Obstetricians and Gynaecologists, and the German, Austrian and Swiss societies of gynecology and obstetrics. The implication is that the limit of viability may have shifted again, from 23 to 22 weeks’ gestation, and considering the importance of adequate timing in ACS administration (within 1 week from delivery), Chawla and colleagues posited that ACS administration can be considered as early as 21 weeks’ gestation when birth is anticipated at 22 weeks and active postnatal management is planned (notably, this should be the correct interpretation of the article title, not that ACS may be beneficial in 21-weeks’ gestational age births). ●

Chawla S, Wyckoff MH, Rysavy MA, et al; Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network. Association of antenatal steroid exposure at 21 to 22 weeks of gestation with neonatal survival and survival without morbidities. JAMA Netw Open. 2022;5:e2233331. doi:10.1001/jamanet workopen.2022.33331.

EXPERT COMMENTARY

The single most important intervention available in obstetrics to improve the health outcomes of preterm newborns is the maternal administration of corticosteroids. The 27 randomized controlled trials that formed the basis for this knowledge¹ did not include infants delivered at 24 weeks’ gestation or less. This has not dissuaded us, over the last several decades, from using corticosteroids for impending delivery at 24 weeks’ gestation; in the absence of randomized data, this has been based on observational evidence of benefit.

Following the 2011 publication of a retrospective cohort study that analyzed data collected by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Neonatal Research Network between 1993 and 2009 (the Carlo study),² ACS started to be used widely even for impending delivery at 23 weeks’ gestation. That study had found that the odds of death and neurodevelopmental impairment at 18 to 22 months of age were significantly lower in cases that received ACS and were born at 23 weeks (n = 1,978). The same benefit could not be verified for infants born at 22 weeks’ gestational age (n = 402).

In a recent study conducted by the same NICHD Neonatal Research Network, antenatal steroid exposure at 21 to 22 weeks of gestation was examined.

ILLUSTRATION: KIMBERLY MARTENS FOR OBG MANAGEMENT

Details of the study

Using prospectively collected data from 2016 to 2019, Chawla and colleagues conducted a retrospective cohort study that analyzed data from 431 infants who were born between 22 0/7 and 23 6/7 weeks’ gestation and received neonatal intensive care (179 infants born at 22 weeks’ gestation).³ The infants not exposed to ACS were compared with those who had partial exposure (only 1 dose) and those with complete ACS exposure (2 doses).

Complete ACS exposure proved to be beneficial, increasing survival to discharge from 35.5% in the no-exposure group to 53.9% (adjusted odds ratio [aOR], 1.95; 95% confidence interval [CI], 1.07–3.56). Of the survivors, 26.9% in the complete-exposure group had no major morbidities compared with 10% in the no-exposure group (aOR, 2.74; 95% CI, 1.19–6.30).

Study strengths and limitations

The strengths of this study include the use of a diverse, multicenter cohort, with contemporary delivery data, which increases the generalizability of the findings. The analysis included aspects often overlooked in other similar studies, such as the dose of ACS exposure and the gestational age at the time of exposure.

The observational study design, however, can suggest only associations rather than causal relationships. Observational studies also are apt to be affected by residual confounding. Such limitations can only be overcome by a randomized controlled trial, but such a trial of ACS at periviable gestational ages seems unfeasible due to limited ethical justification.

Another limitation is the reporting on outcomes as a collective group (22–23 weeks’ gestation). It is important to consider each gestational age week separately due to differences in physiology and potential biological limitations. It cannot be assumed that 22 weeks behaves like 23 weeks, just as 21 weeks is not equivalent to 22 weeks.

The study results suggest that the protective effect of ACS was dose dependent. However, the interpretation that only a complete ACS exposure was beneficial should be viewed cautiously because the study had no power to assess the impact of a partial exposure.

A further limitation is the lack of consideration in analysis for maternal comorbidities and fetal growth restriction. In the Carlo study, the beneficial effect of corticosteroids in 23-week gestational age deliveries was not demonstrable in pregnancies affected by fetal growth restriction or maternal hypertension.

Other studies considered

Given all its limitations, can we assume that the study by Chawla and colleagues has reliably refuted the Carlo study’s suggestion of lack of ACS efficacy in infants born at 22 weeks’ gestation? Taken by itself, probably not. In the context of other recent investigations, yes.

A retrospective registry study that used data from the Vermont Oxford Network for the period 2012–2016 on 1,058 infants born at 22 weeks’ gestation found that infants who were exposed to ACS and received postnatal life support were more likely to survive to hospital discharge without major morbidity compared with infants who received postnatal life support alone.⁴ Overall survival was 38.5% versus 17.7% (adjusted risk ratio [aRR], 2.11; 95% CI, 1.68–2.65), and survival without major morbidity was 4.4% versus 1.0% (aRR, 4.35; 95% CI, 1.84–10.28).

An even larger cohort study that used data from the National Center for Health Statistics concluded that survival at age 1 year for infants born at 22 weeks (n = 2,635) during 2009–2014 was improved in those exposed to ACS followed by postnatal life support compared with postnatal life support alone (45.2% vs 27.8%; aRR, 1.6; 95% CI, 1.2–2.1).⁵

A meta-analysis of observational studies that reported on infants born between 22 0/7 and 22 6/7 weeks’ gestation (n = 2,226) who received proactive neonatal treatment found that administration of ACS doubled the rate of survival when compared with no ACS administration (39% vs 19.5%; P<.01).⁶

In September 2021, the recommendations from the American College of Obstetricians and Gynecologists changed, stating that ACS can be considered at 22 weeks’ gestation when active postnatal management is desired.⁷ This recommendation is largely congruent with those from several other national and international medical organizations, including the World Association of Perinatal Medicine, the Royal Collegeof Obstetricians and Gynaecologists, and the German, Austrian and Swiss societies of gynecology and obstetrics. The implication is that the limit of viability may have shifted again, from 23 to 22 weeks’ gestation, and considering the importance of adequate timing in ACS administration (within 1 week from delivery), Chawla and colleagues posited that ACS administration can be considered as early as 21 weeks’ gestation when birth is anticipated at 22 weeks and active postnatal management is planned (notably, this should be the correct interpretation of the article title, not that ACS may be beneficial in 21-weeks’ gestational age births). ●

Chawla S, Wyckoff MH, Rysavy MA, et al; Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network. Association of antenatal steroid exposure at 21 to 22 weeks of gestation with neonatal survival and survival without morbidities. JAMA Netw Open. 2022;5:e2233331. doi:10.1001/jamanet workopen.2022.33331.

EXPERT COMMENTARY

The single most important intervention available in obstetrics to improve the health outcomes of preterm newborns is the maternal administration of corticosteroids. The 27 randomized controlled trials that formed the basis for this knowledge¹ did not include infants delivered at 24 weeks’ gestation or less. This has not dissuaded us, over the last several decades, from using corticosteroids for impending delivery at 24 weeks’ gestation; in the absence of randomized data, this has been based on observational evidence of benefit.

Following the 2011 publication of a retrospective cohort study that analyzed data collected by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Neonatal Research Network between 1993 and 2009 (the Carlo study),² ACS started to be used widely even for impending delivery at 23 weeks’ gestation. That study had found that the odds of death and neurodevelopmental impairment at 18 to 22 months of age were significantly lower in cases that received ACS and were born at 23 weeks (n = 1,978). The same benefit could not be verified for infants born at 22 weeks’ gestational age (n = 402).

In a recent study conducted by the same NICHD Neonatal Research Network, antenatal steroid exposure at 21 to 22 weeks of gestation was examined.

ILLUSTRATION: KIMBERLY MARTENS FOR OBG MANAGEMENT

Details of the study

Using prospectively collected data from 2016 to 2019, Chawla and colleagues conducted a retrospective cohort study that analyzed data from 431 infants who were born between 22 0/7 and 23 6/7 weeks’ gestation and received neonatal intensive care (179 infants born at 22 weeks’ gestation).³ The infants not exposed to ACS were compared with those who had partial exposure (only 1 dose) and those with complete ACS exposure (2 doses).

Complete ACS exposure proved to be beneficial, increasing survival to discharge from 35.5% in the no-exposure group to 53.9% (adjusted odds ratio [aOR], 1.95; 95% confidence interval [CI], 1.07–3.56). Of the survivors, 26.9% in the complete-exposure group had no major morbidities compared with 10% in the no-exposure group (aOR, 2.74; 95% CI, 1.19–6.30).

Study strengths and limitations

The strengths of this study include the use of a diverse, multicenter cohort, with contemporary delivery data, which increases the generalizability of the findings. The analysis included aspects often overlooked in other similar studies, such as the dose of ACS exposure and the gestational age at the time of exposure.

The observational study design, however, can suggest only associations rather than causal relationships. Observational studies also are apt to be affected by residual confounding. Such limitations can only be overcome by a randomized controlled trial, but such a trial of ACS at periviable gestational ages seems unfeasible due to limited ethical justification.

Another limitation is the reporting on outcomes as a collective group (22–23 weeks’ gestation). It is important to consider each gestational age week separately due to differences in physiology and potential biological limitations. It cannot be assumed that 22 weeks behaves like 23 weeks, just as 21 weeks is not equivalent to 22 weeks.

The study results suggest that the protective effect of ACS was dose dependent. However, the interpretation that only a complete ACS exposure was beneficial should be viewed cautiously because the study had no power to assess the impact of a partial exposure.

A further limitation is the lack of consideration in analysis for maternal comorbidities and fetal growth restriction. In the Carlo study, the beneficial effect of corticosteroids in 23-week gestational age deliveries was not demonstrable in pregnancies affected by fetal growth restriction or maternal hypertension.

Other studies considered

Given all its limitations, can we assume that the study by Chawla and colleagues has reliably refuted the Carlo study’s suggestion of lack of ACS efficacy in infants born at 22 weeks’ gestation? Taken by itself, probably not. In the context of other recent investigations, yes.

A retrospective registry study that used data from the Vermont Oxford Network for the period 2012–2016 on 1,058 infants born at 22 weeks’ gestation found that infants who were exposed to ACS and received postnatal life support were more likely to survive to hospital discharge without major morbidity compared with infants who received postnatal life support alone.⁴ Overall survival was 38.5% versus 17.7% (adjusted risk ratio [aRR], 2.11; 95% CI, 1.68–2.65), and survival without major morbidity was 4.4% versus 1.0% (aRR, 4.35; 95% CI, 1.84–10.28).

An even larger cohort study that used data from the National Center for Health Statistics concluded that survival at age 1 year for infants born at 22 weeks (n = 2,635) during 2009–2014 was improved in those exposed to ACS followed by postnatal life support compared with postnatal life support alone (45.2% vs 27.8%; aRR, 1.6; 95% CI, 1.2–2.1).⁵

A meta-analysis of observational studies that reported on infants born between 22 0/7 and 22 6/7 weeks’ gestation (n = 2,226) who received proactive neonatal treatment found that administration of ACS doubled the rate of survival when compared with no ACS administration (39% vs 19.5%; P<.01).⁶

In September 2021, the recommendations from the American College of Obstetricians and Gynecologists changed, stating that ACS can be considered at 22 weeks’ gestation when active postnatal management is desired.⁷ This recommendation is largely congruent with those from several other national and international medical organizations, including the World Association of Perinatal Medicine, the Royal Collegeof Obstetricians and Gynaecologists, and the German, Austrian and Swiss societies of gynecology and obstetrics. The implication is that the limit of viability may have shifted again, from 23 to 22 weeks’ gestation, and considering the importance of adequate timing in ACS administration (within 1 week from delivery), Chawla and colleagues posited that ACS administration can be considered as early as 21 weeks’ gestation when birth is anticipated at 22 weeks and active postnatal management is planned (notably, this should be the correct interpretation of the article title, not that ACS may be beneficial in 21-weeks’ gestational age births). ●

Marklund A, Lekberg T, Hedayati E, et al. Relapse rates and disease-specific mortality following procedures for fertility preservation at time of breast cancer diagnosis. JAMA Oncol. 2022;8:1438-1446. doi:10.1001/jamaoncol.2022.3677.

EXPERT COMMENTARY

Breast cancer is the most diagnosed cancer among US women after skin cancer.¹ As of the end of 2020, 7.8 million women were alive who were diagnosed with breast cancer in the past 5 years, making it the world’s most prevalent cancer. Given the wide reach of breast cancer and the increase in its distant stage by more than 4% per year in women of reproductive age (20–39 years), clinicians are urged to address fertility preservation due to reproductive compromise of gonadotoxic therapies and gonadectomy.² To predict the risk of infertility following chemotherapy, a Cyclophosphamide Equivalent Dose (CED) calculator can be used. A CED of 4,000 mg/m² has been associated with a significant risk of infertility.³

In 2012, the American Society for Reproductive Medicine removed the experimental label of oocyte cryopreservation then recently endorsed ovarian cryopreservation, thereby providing acceptable procedures for fertility preservation.⁴ Gonadotropin-releasing hormone agonist use during chemotherapy, which is used to protect the ovary in premenopausal women against the effects of chemotherapy, has been shown to have inconsistent findings and should not replace the established modalities of oocyte/embryo/ovarian tissue cryopreservation.^2,5

Details of the study

While studies have been reassuring that ovarian stimulation for fertility preservation in women with breast cancer does not worsen the prognosis, findings are limited by short-term follow-up.⁶

The recent study by Marklund and colleagues presented an analysis of breast cancer relapse and mortality following fertility preservation with and without hormonal stimulation. In their prospective cohort study of 425 Swedish women who underwent fertility preservation, the authors categorized patients into 2 groups: oocyte and embryo cryopreservation by ovarian hormonal stimulation and ovarian tissue cryopreservation without hormonal stimulation. The control group included 850 women with breast cancer who did not undergo fertility preservation. The cohort and the control groups were matched on age, calendar period of diagnosis, and region. Three Swedish registers for breast cancer were used to obtain the study cohort, and for each participant, 2 breast cancer patients who were unexposed to fertility preservation were used for comparison. The primary outcome was mortality while the secondary outcome was any event of death due to breast cancer or relapse.

Results. A total of 1,275 women were studied at the time of breast cancer diagnosis. After stratification, which included age, parity at diagnosis, tumor size, number of lymph node metastases, and estrogen receptor status, disease-specific mortality was similar in all categories of women, that is, hormonal fertility preservation, nonhormonal fertility preservation, and controls. In the subcohort of 723 women, the adjusted rate of relapse and disease-specific mortality remained the same among all groups.

Study strengths and limitations

This study prompts several areas of criticism. The follow-up of breast cancer patients was only 5 years, adding to the limitations of short-term monitoring seen in prior studies. The authors also considered a delay in pregnancy attempts following breast cancer treatment of hormonally sensitive cancers of 5 to 10 years. However, the long-term safety of pregnancy following breast cancer has shown a statistically significantly superior disease-free survival (DFS) in patients who became pregnant less than 2 years from diagnosis and no difference in those who became pregnant 2 or more years from diagnosis.⁷

Only 58 women in the nonhormonal fertility preservation group (ovarian tissue cryopreservation) were studied, which may limit an adequate evaluation although it is not expected to negatively impact breast cancer prognosis. Another area of potential bias was the use of only a subcohort to assess relapse-free survival as opposed to the entire cohort that was used to assess mortality.

Strengths of this study include obligatory reporting to the registry and equal access to anticancer treatment and fertility preservation in Sweden. Ovarian stimulating drugs were examined, as letrozole is often used in breast cancer patients to maintain lower estradiol levels due to aromatase inhibition. Nevertheless, this study did not demonstrate a difference in mortality with or without letrozole use. ●

Marklund A, Lekberg T, Hedayati E, et al. Relapse rates and disease-specific mortality following procedures for fertility preservation at time of breast cancer diagnosis. JAMA Oncol. 2022;8:1438-1446. doi:10.1001/jamaoncol.2022.3677.

EXPERT COMMENTARY

Breast cancer is the most diagnosed cancer among US women after skin cancer.¹ As of the end of 2020, 7.8 million women were alive who were diagnosed with breast cancer in the past 5 years, making it the world’s most prevalent cancer. Given the wide reach of breast cancer and the increase in its distant stage by more than 4% per year in women of reproductive age (20–39 years), clinicians are urged to address fertility preservation due to reproductive compromise of gonadotoxic therapies and gonadectomy.² To predict the risk of infertility following chemotherapy, a Cyclophosphamide Equivalent Dose (CED) calculator can be used. A CED of 4,000 mg/m² has been associated with a significant risk of infertility.³

In 2012, the American Society for Reproductive Medicine removed the experimental label of oocyte cryopreservation then recently endorsed ovarian cryopreservation, thereby providing acceptable procedures for fertility preservation.⁴ Gonadotropin-releasing hormone agonist use during chemotherapy, which is used to protect the ovary in premenopausal women against the effects of chemotherapy, has been shown to have inconsistent findings and should not replace the established modalities of oocyte/embryo/ovarian tissue cryopreservation.^2,5

Details of the study

While studies have been reassuring that ovarian stimulation for fertility preservation in women with breast cancer does not worsen the prognosis, findings are limited by short-term follow-up.⁶

The recent study by Marklund and colleagues presented an analysis of breast cancer relapse and mortality following fertility preservation with and without hormonal stimulation. In their prospective cohort study of 425 Swedish women who underwent fertility preservation, the authors categorized patients into 2 groups: oocyte and embryo cryopreservation by ovarian hormonal stimulation and ovarian tissue cryopreservation without hormonal stimulation. The control group included 850 women with breast cancer who did not undergo fertility preservation. The cohort and the control groups were matched on age, calendar period of diagnosis, and region. Three Swedish registers for breast cancer were used to obtain the study cohort, and for each participant, 2 breast cancer patients who were unexposed to fertility preservation were used for comparison. The primary outcome was mortality while the secondary outcome was any event of death due to breast cancer or relapse.

Results. A total of 1,275 women were studied at the time of breast cancer diagnosis. After stratification, which included age, parity at diagnosis, tumor size, number of lymph node metastases, and estrogen receptor status, disease-specific mortality was similar in all categories of women, that is, hormonal fertility preservation, nonhormonal fertility preservation, and controls. In the subcohort of 723 women, the adjusted rate of relapse and disease-specific mortality remained the same among all groups.

Study strengths and limitations

This study prompts several areas of criticism. The follow-up of breast cancer patients was only 5 years, adding to the limitations of short-term monitoring seen in prior studies. The authors also considered a delay in pregnancy attempts following breast cancer treatment of hormonally sensitive cancers of 5 to 10 years. However, the long-term safety of pregnancy following breast cancer has shown a statistically significantly superior disease-free survival (DFS) in patients who became pregnant less than 2 years from diagnosis and no difference in those who became pregnant 2 or more years from diagnosis.⁷

Only 58 women in the nonhormonal fertility preservation group (ovarian tissue cryopreservation) were studied, which may limit an adequate evaluation although it is not expected to negatively impact breast cancer prognosis. Another area of potential bias was the use of only a subcohort to assess relapse-free survival as opposed to the entire cohort that was used to assess mortality.

Strengths of this study include obligatory reporting to the registry and equal access to anticancer treatment and fertility preservation in Sweden. Ovarian stimulating drugs were examined, as letrozole is often used in breast cancer patients to maintain lower estradiol levels due to aromatase inhibition. Nevertheless, this study did not demonstrate a difference in mortality with or without letrozole use. ●

Marklund A, Lekberg T, Hedayati E, et al. Relapse rates and disease-specific mortality following procedures for fertility preservation at time of breast cancer diagnosis. JAMA Oncol. 2022;8:1438-1446. doi:10.1001/jamaoncol.2022.3677.

EXPERT COMMENTARY

Breast cancer is the most diagnosed cancer among US women after skin cancer.¹ As of the end of 2020, 7.8 million women were alive who were diagnosed with breast cancer in the past 5 years, making it the world’s most prevalent cancer. Given the wide reach of breast cancer and the increase in its distant stage by more than 4% per year in women of reproductive age (20–39 years), clinicians are urged to address fertility preservation due to reproductive compromise of gonadotoxic therapies and gonadectomy.² To predict the risk of infertility following chemotherapy, a Cyclophosphamide Equivalent Dose (CED) calculator can be used. A CED of 4,000 mg/m² has been associated with a significant risk of infertility.³

In 2012, the American Society for Reproductive Medicine removed the experimental label of oocyte cryopreservation then recently endorsed ovarian cryopreservation, thereby providing acceptable procedures for fertility preservation.⁴ Gonadotropin-releasing hormone agonist use during chemotherapy, which is used to protect the ovary in premenopausal women against the effects of chemotherapy, has been shown to have inconsistent findings and should not replace the established modalities of oocyte/embryo/ovarian tissue cryopreservation.^2,5

Details of the study

While studies have been reassuring that ovarian stimulation for fertility preservation in women with breast cancer does not worsen the prognosis, findings are limited by short-term follow-up.⁶

The recent study by Marklund and colleagues presented an analysis of breast cancer relapse and mortality following fertility preservation with and without hormonal stimulation. In their prospective cohort study of 425 Swedish women who underwent fertility preservation, the authors categorized patients into 2 groups: oocyte and embryo cryopreservation by ovarian hormonal stimulation and ovarian tissue cryopreservation without hormonal stimulation. The control group included 850 women with breast cancer who did not undergo fertility preservation. The cohort and the control groups were matched on age, calendar period of diagnosis, and region. Three Swedish registers for breast cancer were used to obtain the study cohort, and for each participant, 2 breast cancer patients who were unexposed to fertility preservation were used for comparison. The primary outcome was mortality while the secondary outcome was any event of death due to breast cancer or relapse.

Results. A total of 1,275 women were studied at the time of breast cancer diagnosis. After stratification, which included age, parity at diagnosis, tumor size, number of lymph node metastases, and estrogen receptor status, disease-specific mortality was similar in all categories of women, that is, hormonal fertility preservation, nonhormonal fertility preservation, and controls. In the subcohort of 723 women, the adjusted rate of relapse and disease-specific mortality remained the same among all groups.

Study strengths and limitations

This study prompts several areas of criticism. The follow-up of breast cancer patients was only 5 years, adding to the limitations of short-term monitoring seen in prior studies. The authors also considered a delay in pregnancy attempts following breast cancer treatment of hormonally sensitive cancers of 5 to 10 years. However, the long-term safety of pregnancy following breast cancer has shown a statistically significantly superior disease-free survival (DFS) in patients who became pregnant less than 2 years from diagnosis and no difference in those who became pregnant 2 or more years from diagnosis.⁷

Only 58 women in the nonhormonal fertility preservation group (ovarian tissue cryopreservation) were studied, which may limit an adequate evaluation although it is not expected to negatively impact breast cancer prognosis. Another area of potential bias was the use of only a subcohort to assess relapse-free survival as opposed to the entire cohort that was used to assess mortality.

Strengths of this study include obligatory reporting to the registry and equal access to anticancer treatment and fertility preservation in Sweden. Ovarian stimulating drugs were examined, as letrozole is often used in breast cancer patients to maintain lower estradiol levels due to aromatase inhibition. Nevertheless, this study did not demonstrate a difference in mortality with or without letrozole use. ●

In 1993, managing patients with stroke had long remained an elusive and somewhat intimidating task for the neurological world. Previous efforts to treat the condition had produced more frustration than success, leaving clinicians and patients alike in despair for a solution. However, some successes in treating coronary thrombosis during that era rejuvenated researchers’ efforts to crack the code. An international team of researchers had studied a Streptococcus derivative (streptokinase) and others had begun to study a natural substance termed tissue plasminogen activator (tPA) as thrombolytic agents to lyse coronary clots and to treat pulmonary embolism. The adverse event of excessive bleeding found in Australian studies done on streptokinase intervention in patients with stroke prompted researchers to contemplate use of tPA in stroke management.

The combination of tPA and advanced imaging technology led researchers to take a unique approach that would forever revolutionize stroke management, beginning in the early 1990s.

A group of German, Japanese, and American investigators began to research thrombolysis in acute stroke patients during the mid-1980s.

“What was unique is that patients had a CT scan followed by a catheter angiogram,” said Louis Caplan, MD, a senior member of the division of cerebrovascular disease at Beth Israel Deaconess Medical Center, Boston, professor of neurology at Harvard Medical School, Boston, and founder of the Harvard Stroke Registry at Beth Israel Deaconess Medical Center.

“If they had a blocked vessel, they got the drug, delivered either intravenously or intra-arterially.”

The process involved keeping the catheter open after drug administration to determine whether the vessel had opened or remained occluded. The researchers learned which blocked vessels opened when the drug was given intravenously and which required direct introduction of the drug into the clots.

A group of investigators in the United States funded by the National Institute of Neurological Disease and Stroke then performed a randomized therapeutic trial of intravenous tPA given within 90 minutes and 180 minutes after stroke symptom onset. The study was reported in the New England Journal of Medicine. Soon thereafter, in 1995, the Food and Drug Administration approved the use of tPA following the inclusion and exclusion rules used in the NINDS trial.

After the FDA approved tPA in 1995, stroke management was never the same.
 

tPA was just one factor in optimizing stroke management

Despite the major therapeutic breakthrough with tPA’s approval, it took the clinics, hospitals, and other acute care systems a while to catch up. “Neurologists and hospitals weren’t ready for acute stroke intervention and proper stroke management in the mid-90s,” Dr. Caplan recalled. “At the time, stroke wasn’t at the forefront of treatment, general neurologists weren’t trained, and there weren’t enough stroke neurologists.”

The preparation and training deficit was further exacerbated by low reimbursement for services. As a result, only about 5% of patients who were eligible for acute stroke management were treated with tPA.

According to Dr. Caplan, during the next 15-20 years, the accumulation of stroke data from MRI and CT vascular imaging clarified further which patients, with what extent of infarction, with which blocked vessels, would be good candidates for treatment.

More patients received interventional treatment using catheters directed into the area of clotting in attempt to remove the blockages. In addition, information regarding intervention at different periods (10-16 hours, up to 24 hours) and conditions (for example, patients with varying degrees of disability, infarct) were tested.

Eventually, hospitals became more attuned to emergency stroke treatment. More neurologists became trained, more stroke centers emerged, and clinicians enjoyed the benefit of technological advancements that allowed them to explore perfusion.
 

While decentralized care enhances outcomes in stroke management, more progress is needed

As of early 2023, stroke is one of the leading emergency diagnoses, and patients have access to primary and secondary stroke centers that are sprinkled throughout the United States. As impressive as the feat may seem, health care systems still have major strides to make to truly optimize therapy and outcomes in this patient population.

For example, location and access remain important issues. Secondary centers are typically located in large, metropolitan areas. While an urban location makes a primary center geographically more accessible to a larger patient population, traffic frequently hinders door-to-door access.

In the case of rural centers, distance can retard access, but they also face the challenges of how to route patients – especially patients who require more specialized care offered by secondary centers. Fortunately, primary centers have some ways to help better support their patients.

“One thing that happened is that primary centers made agreements with secondary centers via telemedicine to determine whether patients should be treated at the primary center or whether they should be routed to the higher-level center. These arrangements were termed ‘spoke and wheel,’ ” Dr. Caplan told this publication.

However, not all patients who are candidates for transport to a secondary center are able to be transported. In such cases, primary centers can use telemedicine to collaborate with secondary centers for support.

Logistics aside, perhaps today’s greatest challenge for clinicians is ensuring their patients and families receive education to increase their awareness of stroke centers as an important option for treatment and outcome optimization. Many patients and their loved ones do not realize that these centers exist or how to utilize them if and when the time comes.

Right now, some cities have stroke ambulances staffed with physicians to treat patients in the field. This decentralized model helps address access burdens such as door-to-needle delays and transportation while improving survival and recovery. Dr. Caplan said these services are available in Munich, and in a few select U.S. cities such as Cleveland and Houston, which helped pioneer the concept.
 

Better access in the future?

Looking ahead, Dr. Caplan seems optimistic about how stroke management will continue to evolve. Many cities will have stroke ambulances to provide on-site care, while stroke institutions will improve their cross-collaborative efforts to support their patient populations.

At the crux of cross-collaboration lies enhanced communication between peripheral and urban hospitals.

“Peripheral and urban hospitals and state organizations will engage in smoother integration to figure out when to take patient to the bigger hospitals,” Dr. Caplan said. “I also believe we will see greater emphasis on rehabilitation and recovery.”

As promising as the future looks, only time will tell.
 

In 1993, managing patients with stroke had long remained an elusive and somewhat intimidating task for the neurological world. Previous efforts to treat the condition had produced more frustration than success, leaving clinicians and patients alike in despair for a solution. However, some successes in treating coronary thrombosis during that era rejuvenated researchers’ efforts to crack the code. An international team of researchers had studied a Streptococcus derivative (streptokinase) and others had begun to study a natural substance termed tissue plasminogen activator (tPA) as thrombolytic agents to lyse coronary clots and to treat pulmonary embolism. The adverse event of excessive bleeding found in Australian studies done on streptokinase intervention in patients with stroke prompted researchers to contemplate use of tPA in stroke management.

The combination of tPA and advanced imaging technology led researchers to take a unique approach that would forever revolutionize stroke management, beginning in the early 1990s.

A group of German, Japanese, and American investigators began to research thrombolysis in acute stroke patients during the mid-1980s.

“What was unique is that patients had a CT scan followed by a catheter angiogram,” said Louis Caplan, MD, a senior member of the division of cerebrovascular disease at Beth Israel Deaconess Medical Center, Boston, professor of neurology at Harvard Medical School, Boston, and founder of the Harvard Stroke Registry at Beth Israel Deaconess Medical Center.

“If they had a blocked vessel, they got the drug, delivered either intravenously or intra-arterially.”

The process involved keeping the catheter open after drug administration to determine whether the vessel had opened or remained occluded. The researchers learned which blocked vessels opened when the drug was given intravenously and which required direct introduction of the drug into the clots.

A group of investigators in the United States funded by the National Institute of Neurological Disease and Stroke then performed a randomized therapeutic trial of intravenous tPA given within 90 minutes and 180 minutes after stroke symptom onset. The study was reported in the New England Journal of Medicine. Soon thereafter, in 1995, the Food and Drug Administration approved the use of tPA following the inclusion and exclusion rules used in the NINDS trial.

After the FDA approved tPA in 1995, stroke management was never the same.
 

tPA was just one factor in optimizing stroke management

Despite the major therapeutic breakthrough with tPA’s approval, it took the clinics, hospitals, and other acute care systems a while to catch up. “Neurologists and hospitals weren’t ready for acute stroke intervention and proper stroke management in the mid-90s,” Dr. Caplan recalled. “At the time, stroke wasn’t at the forefront of treatment, general neurologists weren’t trained, and there weren’t enough stroke neurologists.”

The preparation and training deficit was further exacerbated by low reimbursement for services. As a result, only about 5% of patients who were eligible for acute stroke management were treated with tPA.

According to Dr. Caplan, during the next 15-20 years, the accumulation of stroke data from MRI and CT vascular imaging clarified further which patients, with what extent of infarction, with which blocked vessels, would be good candidates for treatment.

More patients received interventional treatment using catheters directed into the area of clotting in attempt to remove the blockages. In addition, information regarding intervention at different periods (10-16 hours, up to 24 hours) and conditions (for example, patients with varying degrees of disability, infarct) were tested.

Eventually, hospitals became more attuned to emergency stroke treatment. More neurologists became trained, more stroke centers emerged, and clinicians enjoyed the benefit of technological advancements that allowed them to explore perfusion.
 

While decentralized care enhances outcomes in stroke management, more progress is needed

As of early 2023, stroke is one of the leading emergency diagnoses, and patients have access to primary and secondary stroke centers that are sprinkled throughout the United States. As impressive as the feat may seem, health care systems still have major strides to make to truly optimize therapy and outcomes in this patient population.

For example, location and access remain important issues. Secondary centers are typically located in large, metropolitan areas. While an urban location makes a primary center geographically more accessible to a larger patient population, traffic frequently hinders door-to-door access.

In the case of rural centers, distance can retard access, but they also face the challenges of how to route patients – especially patients who require more specialized care offered by secondary centers. Fortunately, primary centers have some ways to help better support their patients.

“One thing that happened is that primary centers made agreements with secondary centers via telemedicine to determine whether patients should be treated at the primary center or whether they should be routed to the higher-level center. These arrangements were termed ‘spoke and wheel,’ ” Dr. Caplan told this publication.

However, not all patients who are candidates for transport to a secondary center are able to be transported. In such cases, primary centers can use telemedicine to collaborate with secondary centers for support.

Logistics aside, perhaps today’s greatest challenge for clinicians is ensuring their patients and families receive education to increase their awareness of stroke centers as an important option for treatment and outcome optimization. Many patients and their loved ones do not realize that these centers exist or how to utilize them if and when the time comes.

Right now, some cities have stroke ambulances staffed with physicians to treat patients in the field. This decentralized model helps address access burdens such as door-to-needle delays and transportation while improving survival and recovery. Dr. Caplan said these services are available in Munich, and in a few select U.S. cities such as Cleveland and Houston, which helped pioneer the concept.
 

Better access in the future?

Looking ahead, Dr. Caplan seems optimistic about how stroke management will continue to evolve. Many cities will have stroke ambulances to provide on-site care, while stroke institutions will improve their cross-collaborative efforts to support their patient populations.

At the crux of cross-collaboration lies enhanced communication between peripheral and urban hospitals.

“Peripheral and urban hospitals and state organizations will engage in smoother integration to figure out when to take patient to the bigger hospitals,” Dr. Caplan said. “I also believe we will see greater emphasis on rehabilitation and recovery.”

As promising as the future looks, only time will tell.
 

In 1993, managing patients with stroke had long remained an elusive and somewhat intimidating task for the neurological world. Previous efforts to treat the condition had produced more frustration than success, leaving clinicians and patients alike in despair for a solution. However, some successes in treating coronary thrombosis during that era rejuvenated researchers’ efforts to crack the code. An international team of researchers had studied a Streptococcus derivative (streptokinase) and others had begun to study a natural substance termed tissue plasminogen activator (tPA) as thrombolytic agents to lyse coronary clots and to treat pulmonary embolism. The adverse event of excessive bleeding found in Australian studies done on streptokinase intervention in patients with stroke prompted researchers to contemplate use of tPA in stroke management.

The combination of tPA and advanced imaging technology led researchers to take a unique approach that would forever revolutionize stroke management, beginning in the early 1990s.

A group of German, Japanese, and American investigators began to research thrombolysis in acute stroke patients during the mid-1980s.

“What was unique is that patients had a CT scan followed by a catheter angiogram,” said Louis Caplan, MD, a senior member of the division of cerebrovascular disease at Beth Israel Deaconess Medical Center, Boston, professor of neurology at Harvard Medical School, Boston, and founder of the Harvard Stroke Registry at Beth Israel Deaconess Medical Center.

“If they had a blocked vessel, they got the drug, delivered either intravenously or intra-arterially.”

The process involved keeping the catheter open after drug administration to determine whether the vessel had opened or remained occluded. The researchers learned which blocked vessels opened when the drug was given intravenously and which required direct introduction of the drug into the clots.

A group of investigators in the United States funded by the National Institute of Neurological Disease and Stroke then performed a randomized therapeutic trial of intravenous tPA given within 90 minutes and 180 minutes after stroke symptom onset. The study was reported in the New England Journal of Medicine. Soon thereafter, in 1995, the Food and Drug Administration approved the use of tPA following the inclusion and exclusion rules used in the NINDS trial.

After the FDA approved tPA in 1995, stroke management was never the same.
 

tPA was just one factor in optimizing stroke management

Despite the major therapeutic breakthrough with tPA’s approval, it took the clinics, hospitals, and other acute care systems a while to catch up. “Neurologists and hospitals weren’t ready for acute stroke intervention and proper stroke management in the mid-90s,” Dr. Caplan recalled. “At the time, stroke wasn’t at the forefront of treatment, general neurologists weren’t trained, and there weren’t enough stroke neurologists.”

The preparation and training deficit was further exacerbated by low reimbursement for services. As a result, only about 5% of patients who were eligible for acute stroke management were treated with tPA.

According to Dr. Caplan, during the next 15-20 years, the accumulation of stroke data from MRI and CT vascular imaging clarified further which patients, with what extent of infarction, with which blocked vessels, would be good candidates for treatment.

More patients received interventional treatment using catheters directed into the area of clotting in attempt to remove the blockages. In addition, information regarding intervention at different periods (10-16 hours, up to 24 hours) and conditions (for example, patients with varying degrees of disability, infarct) were tested.

Eventually, hospitals became more attuned to emergency stroke treatment. More neurologists became trained, more stroke centers emerged, and clinicians enjoyed the benefit of technological advancements that allowed them to explore perfusion.
 

While decentralized care enhances outcomes in stroke management, more progress is needed

As of early 2023, stroke is one of the leading emergency diagnoses, and patients have access to primary and secondary stroke centers that are sprinkled throughout the United States. As impressive as the feat may seem, health care systems still have major strides to make to truly optimize therapy and outcomes in this patient population.

For example, location and access remain important issues. Secondary centers are typically located in large, metropolitan areas. While an urban location makes a primary center geographically more accessible to a larger patient population, traffic frequently hinders door-to-door access.

In the case of rural centers, distance can retard access, but they also face the challenges of how to route patients – especially patients who require more specialized care offered by secondary centers. Fortunately, primary centers have some ways to help better support their patients.

“One thing that happened is that primary centers made agreements with secondary centers via telemedicine to determine whether patients should be treated at the primary center or whether they should be routed to the higher-level center. These arrangements were termed ‘spoke and wheel,’ ” Dr. Caplan told this publication.

However, not all patients who are candidates for transport to a secondary center are able to be transported. In such cases, primary centers can use telemedicine to collaborate with secondary centers for support.

Logistics aside, perhaps today’s greatest challenge for clinicians is ensuring their patients and families receive education to increase their awareness of stroke centers as an important option for treatment and outcome optimization. Many patients and their loved ones do not realize that these centers exist or how to utilize them if and when the time comes.

Right now, some cities have stroke ambulances staffed with physicians to treat patients in the field. This decentralized model helps address access burdens such as door-to-needle delays and transportation while improving survival and recovery. Dr. Caplan said these services are available in Munich, and in a few select U.S. cities such as Cleveland and Houston, which helped pioneer the concept.
 

Better access in the future?

Looking ahead, Dr. Caplan seems optimistic about how stroke management will continue to evolve. Many cities will have stroke ambulances to provide on-site care, while stroke institutions will improve their cross-collaborative efforts to support their patient populations.

At the crux of cross-collaboration lies enhanced communication between peripheral and urban hospitals.

“Peripheral and urban hospitals and state organizations will engage in smoother integration to figure out when to take patient to the bigger hospitals,” Dr. Caplan said. “I also believe we will see greater emphasis on rehabilitation and recovery.”

As promising as the future looks, only time will tell.