Lymphoma & Plasma Cell Disorders

ORLANDO – Chimeric antigen receptor (CAR) T cells targeting BCMA eradicated myeloma cells in a patient with a heavy burden of chemotherapy-resistant multiple myeloma.

The patient had received three prior myeloma therapies and relapsed with myeloma making up more than 90% of his bone marrow cells just 3 months after autologous transplant.

CD138-positive plasma cells were completely absent, however, one month after infusion of CAR T cells directed against the B-cell maturation antigen (BCMA), and remain undetectable 14 weeks after infusion.

“We have demonstrated for the first time that CAR T cells can have powerful activity against measurable multiple myeloma,” Dr. James N. Kochenderfer of the National Cancer Institute in Bethesda, Md., said at the annual meeting of the American Society of Hematology.

A second patient, who had five prior lines of myeloma therapy and myeloma in 80% of his bone marrow cells, also experienced a dramatic reduction in myeloma, resulting so far in a partial response. The patient has returned to full-time work and myeloma cells continue to decrease 6 weeks after infusion.

The two ongoing responses, however, were associated with the most severe clinical signs of cytokine release syndrome in the late-breaking abstract study (LBA-1), Dr. Kochenderfer said.

The complete responder experienced cytokine release toxicities including fever, tachycardia, hypotension, elevated liver enzymes, and elevated creatinine kinase that resolved. The patient was also platelet transfusion-dependent for 9 weeks after infusion and a baseline absolute neutrophil count of less than 500 microliters remained at that level for 40 days after infusion. All symptoms resolved within two weeks, he said.

The ongoing partial responder experienced fever, tachycardia, hypotension, acute kidney injury, dyspnea, delirium, and prolonged thrombocytopenia and all completely resolved.

Both patients had much higher serum levels of interleukin-6 than the other patients, he noted.

Both patients also received the highest dose level of anti-BCMA CAR T cells. Going forward, that dose will now only be administered to patients with less than 50% bone marrow plasma cells, Dr. Kochenderfer said.

Other responses among the 12 patients treated thus far include 1 transient very good partial response of 8-week duration, 1 transient partial response lasting 2 weeks, and 8 responses of stable disease.

While three new drugs (elotuzumab, daratumumab, ixazomib) were approved for the treatment of multiple myeloma in the month of November alone, this is early days for CAR T-cell therapy in multiple myeloma.

“Almost all of the CAR T-cell work has been in B-cell malignancies, acute lymphocytic leukemia, and chronic lymphocytic leukemia, so is this the right antigen, we don’t know? Is this the right construct, we don’t know? But there’s clearly activity and that is very exciting,” session comoderator Dr. David P. Steensma of the Dana-Farber Cancer Institute in Boston, said in an interview.

Dana-Farber is conducting a CAR T cell trial in myeloma using a different target and NKG2D ligands. Other centers are also using CAR T cells with different targets. “So maybe other targets would have different results and a better safety profile,” he added.

BCMA is an appropriate target for CAR T cell therapy for multiple reasons, Dr. Kochenderfer said. Multiple myeloma is still an incurable disease and BCMA, a member of the tumor necrosis factor superfamily, is uniformly expressed in 60% to 70% of cases.

Preclinical studies by the team also show that BCMA is not detectable in normal human tissues, but is selectively expressed only in bone marrow, lymphoid organs, and organs known to have plasma cells in their lamina propria and by plasma cells and a small fraction of B cells.

The investigators genetically modified autologous T cells to express an anti-BCMA CAR and ligated it into a replication-incompetent gamma retrovirus. The T cells were stimulated with the anti-CD3 monoclonal antibody OKT3 before transduction, with the entire culture process taking 9 days from start to finish. T cells expressing this CAR recognize BCMA with great specificity, Dr. Kochenderfer observed.

The 12 patients received 300 mg/m² of cyclophosphamide and 30 mg/m² of fludarabine (Fludara) daily for 3 days before a single infusion of anti-BCMA CAR at dose levels of 0.3 x 10⁶ to 9 x 10⁶ T cells/kg. All patients had at least 3 prior therapies and normal organ function. Five had amyloid light chain only, 4 had immunoglobulin gamma disease, and 4 patients, including the complete responder, had immunoglobulin alpha disease.

It’s unclear why only a few patients responded to the CAR T cells, but dose level was likely a big factor and there is a lot of patient variability with T-cell therapies, Dr. Kochenderfer said at a press briefing.

“I wish we knew exactly why some patients respond and some don’t,” he added. “The CAR T cells have shown remarkable activity against really previously refractory diseases like acute lymphocytic leukemia,” noted Dr. George Daley of Harvard Medical School, Boston, in an interview at the meeting. “There’s been a lot of excitement that maybe we can extend the principles that work in leukemia to other types of diseases.”

The study is still ongoing and accruing patients, but a multicenter trial is also being initiated in myeloma with Bluebird Bio using “a closely related, but slightly different CAR,” Dr. Kochenderfer said.

pwendling@frontlinemedcom.com

ORLANDO – Chimeric antigen receptor (CAR) T cells targeting BCMA eradicated myeloma cells in a patient with a heavy burden of chemotherapy-resistant multiple myeloma.

The patient had received three prior myeloma therapies and relapsed with myeloma making up more than 90% of his bone marrow cells just 3 months after autologous transplant.

CD138-positive plasma cells were completely absent, however, one month after infusion of CAR T cells directed against the B-cell maturation antigen (BCMA), and remain undetectable 14 weeks after infusion.

“We have demonstrated for the first time that CAR T cells can have powerful activity against measurable multiple myeloma,” Dr. James N. Kochenderfer of the National Cancer Institute in Bethesda, Md., said at the annual meeting of the American Society of Hematology.

A second patient, who had five prior lines of myeloma therapy and myeloma in 80% of his bone marrow cells, also experienced a dramatic reduction in myeloma, resulting so far in a partial response. The patient has returned to full-time work and myeloma cells continue to decrease 6 weeks after infusion.

The two ongoing responses, however, were associated with the most severe clinical signs of cytokine release syndrome in the late-breaking abstract study (LBA-1), Dr. Kochenderfer said.

The complete responder experienced cytokine release toxicities including fever, tachycardia, hypotension, elevated liver enzymes, and elevated creatinine kinase that resolved. The patient was also platelet transfusion-dependent for 9 weeks after infusion and a baseline absolute neutrophil count of less than 500 microliters remained at that level for 40 days after infusion. All symptoms resolved within two weeks, he said.

The ongoing partial responder experienced fever, tachycardia, hypotension, acute kidney injury, dyspnea, delirium, and prolonged thrombocytopenia and all completely resolved.

Both patients had much higher serum levels of interleukin-6 than the other patients, he noted.

Both patients also received the highest dose level of anti-BCMA CAR T cells. Going forward, that dose will now only be administered to patients with less than 50% bone marrow plasma cells, Dr. Kochenderfer said.

Other responses among the 12 patients treated thus far include 1 transient very good partial response of 8-week duration, 1 transient partial response lasting 2 weeks, and 8 responses of stable disease.

While three new drugs (elotuzumab, daratumumab, ixazomib) were approved for the treatment of multiple myeloma in the month of November alone, this is early days for CAR T-cell therapy in multiple myeloma.

“Almost all of the CAR T-cell work has been in B-cell malignancies, acute lymphocytic leukemia, and chronic lymphocytic leukemia, so is this the right antigen, we don’t know? Is this the right construct, we don’t know? But there’s clearly activity and that is very exciting,” session comoderator Dr. David P. Steensma of the Dana-Farber Cancer Institute in Boston, said in an interview.

Dana-Farber is conducting a CAR T cell trial in myeloma using a different target and NKG2D ligands. Other centers are also using CAR T cells with different targets. “So maybe other targets would have different results and a better safety profile,” he added.

BCMA is an appropriate target for CAR T cell therapy for multiple reasons, Dr. Kochenderfer said. Multiple myeloma is still an incurable disease and BCMA, a member of the tumor necrosis factor superfamily, is uniformly expressed in 60% to 70% of cases.

Preclinical studies by the team also show that BCMA is not detectable in normal human tissues, but is selectively expressed only in bone marrow, lymphoid organs, and organs known to have plasma cells in their lamina propria and by plasma cells and a small fraction of B cells.

The investigators genetically modified autologous T cells to express an anti-BCMA CAR and ligated it into a replication-incompetent gamma retrovirus. The T cells were stimulated with the anti-CD3 monoclonal antibody OKT3 before transduction, with the entire culture process taking 9 days from start to finish. T cells expressing this CAR recognize BCMA with great specificity, Dr. Kochenderfer observed.

The 12 patients received 300 mg/m² of cyclophosphamide and 30 mg/m² of fludarabine (Fludara) daily for 3 days before a single infusion of anti-BCMA CAR at dose levels of 0.3 x 10⁶ to 9 x 10⁶ T cells/kg. All patients had at least 3 prior therapies and normal organ function. Five had amyloid light chain only, 4 had immunoglobulin gamma disease, and 4 patients, including the complete responder, had immunoglobulin alpha disease.

It’s unclear why only a few patients responded to the CAR T cells, but dose level was likely a big factor and there is a lot of patient variability with T-cell therapies, Dr. Kochenderfer said at a press briefing.

“I wish we knew exactly why some patients respond and some don’t,” he added. “The CAR T cells have shown remarkable activity against really previously refractory diseases like acute lymphocytic leukemia,” noted Dr. George Daley of Harvard Medical School, Boston, in an interview at the meeting. “There’s been a lot of excitement that maybe we can extend the principles that work in leukemia to other types of diseases.”

The study is still ongoing and accruing patients, but a multicenter trial is also being initiated in myeloma with Bluebird Bio using “a closely related, but slightly different CAR,” Dr. Kochenderfer said.

pwendling@frontlinemedcom.com

ORLANDO – Chimeric antigen receptor (CAR) T cells targeting BCMA eradicated myeloma cells in a patient with a heavy burden of chemotherapy-resistant multiple myeloma.

The patient had received three prior myeloma therapies and relapsed with myeloma making up more than 90% of his bone marrow cells just 3 months after autologous transplant.

CD138-positive plasma cells were completely absent, however, one month after infusion of CAR T cells directed against the B-cell maturation antigen (BCMA), and remain undetectable 14 weeks after infusion.

“We have demonstrated for the first time that CAR T cells can have powerful activity against measurable multiple myeloma,” Dr. James N. Kochenderfer of the National Cancer Institute in Bethesda, Md., said at the annual meeting of the American Society of Hematology.

A second patient, who had five prior lines of myeloma therapy and myeloma in 80% of his bone marrow cells, also experienced a dramatic reduction in myeloma, resulting so far in a partial response. The patient has returned to full-time work and myeloma cells continue to decrease 6 weeks after infusion.

The two ongoing responses, however, were associated with the most severe clinical signs of cytokine release syndrome in the late-breaking abstract study (LBA-1), Dr. Kochenderfer said.

The complete responder experienced cytokine release toxicities including fever, tachycardia, hypotension, elevated liver enzymes, and elevated creatinine kinase that resolved. The patient was also platelet transfusion-dependent for 9 weeks after infusion and a baseline absolute neutrophil count of less than 500 microliters remained at that level for 40 days after infusion. All symptoms resolved within two weeks, he said.

The ongoing partial responder experienced fever, tachycardia, hypotension, acute kidney injury, dyspnea, delirium, and prolonged thrombocytopenia and all completely resolved.

Both patients had much higher serum levels of interleukin-6 than the other patients, he noted.

Both patients also received the highest dose level of anti-BCMA CAR T cells. Going forward, that dose will now only be administered to patients with less than 50% bone marrow plasma cells, Dr. Kochenderfer said.

Other responses among the 12 patients treated thus far include 1 transient very good partial response of 8-week duration, 1 transient partial response lasting 2 weeks, and 8 responses of stable disease.

While three new drugs (elotuzumab, daratumumab, ixazomib) were approved for the treatment of multiple myeloma in the month of November alone, this is early days for CAR T-cell therapy in multiple myeloma.

“Almost all of the CAR T-cell work has been in B-cell malignancies, acute lymphocytic leukemia, and chronic lymphocytic leukemia, so is this the right antigen, we don’t know? Is this the right construct, we don’t know? But there’s clearly activity and that is very exciting,” session comoderator Dr. David P. Steensma of the Dana-Farber Cancer Institute in Boston, said in an interview.

Dana-Farber is conducting a CAR T cell trial in myeloma using a different target and NKG2D ligands. Other centers are also using CAR T cells with different targets. “So maybe other targets would have different results and a better safety profile,” he added.

BCMA is an appropriate target for CAR T cell therapy for multiple reasons, Dr. Kochenderfer said. Multiple myeloma is still an incurable disease and BCMA, a member of the tumor necrosis factor superfamily, is uniformly expressed in 60% to 70% of cases.

Preclinical studies by the team also show that BCMA is not detectable in normal human tissues, but is selectively expressed only in bone marrow, lymphoid organs, and organs known to have plasma cells in their lamina propria and by plasma cells and a small fraction of B cells.

The investigators genetically modified autologous T cells to express an anti-BCMA CAR and ligated it into a replication-incompetent gamma retrovirus. The T cells were stimulated with the anti-CD3 monoclonal antibody OKT3 before transduction, with the entire culture process taking 9 days from start to finish. T cells expressing this CAR recognize BCMA with great specificity, Dr. Kochenderfer observed.

The 12 patients received 300 mg/m² of cyclophosphamide and 30 mg/m² of fludarabine (Fludara) daily for 3 days before a single infusion of anti-BCMA CAR at dose levels of 0.3 x 10⁶ to 9 x 10⁶ T cells/kg. All patients had at least 3 prior therapies and normal organ function. Five had amyloid light chain only, 4 had immunoglobulin gamma disease, and 4 patients, including the complete responder, had immunoglobulin alpha disease.

It’s unclear why only a few patients responded to the CAR T cells, but dose level was likely a big factor and there is a lot of patient variability with T-cell therapies, Dr. Kochenderfer said at a press briefing.

“I wish we knew exactly why some patients respond and some don’t,” he added. “The CAR T cells have shown remarkable activity against really previously refractory diseases like acute lymphocytic leukemia,” noted Dr. George Daley of Harvard Medical School, Boston, in an interview at the meeting. “There’s been a lot of excitement that maybe we can extend the principles that work in leukemia to other types of diseases.”

The study is still ongoing and accruing patients, but a multicenter trial is also being initiated in myeloma with Bluebird Bio using “a closely related, but slightly different CAR,” Dr. Kochenderfer said.

pwendling@frontlinemedcom.com

Stephan Stilgenbauer, MD

Photo courtesy of ASH

ORLANDO, FL—The pivotal phase 2 study of venetoclax monotherapy in patients with relapsed/refractory 17p-deleted chronic lymphocytic leukemia (CLL) has achieved unprecedented deep responses, according to investigators.

More than 10% of patients had a complete response (CR), complete response with incomplete blood count recovery (CRi), or near partial response (nPR), as confirmed by an independent review committee (IRC).

And more than 20% of responders became negative for minimal residual disease (MRD).

Venetoclax is an orally bioavailable, selective BCL-2 inhibitor that directly induces apoptosis in CLL cells independent of p53.

The US Food and Drug Administration granted venetoclax breakthrough therapy designation for relapsed/refractory CLL earlier this year.

“Patients with a 17p deletion in CLL have very poor prognosis,” said Stephan Stilgenbauer, MD, of University of Ulm in Germany, “and limited treatment options.”

The median progression-free survival (PFS) with frontline chemoimmunotherapy in this population is less than 12 months.

The first-in-human study of venetoclax, which was recently published in NEJM, showed a 79% overall response rate (ORR) in relapsed/refractory CLL patients.

Dr Stilgenbauer presented the pivotal phase 2 results at the 2015 ASH Annual Meeting as LBA-6.

Study overview

The primary objective of the trial was ORR by independent review committee. The secondary endpoints were CR/PR rates, time to first response, duration of response, PFS, overall survival (OS), and safety.

Investigators also included the exploratory endpoint of MRD as determined by flow cytometry with a sensitivity of less than 10-4.

Patients had to have an ECOG score of 2 or less, an absolute neutrophil count of 1000/μL or greater, a platelet count of 40,000/mm³ or higher, and a hemoglobin count of at least 8 g/dL. They also had to have a creatinine clearance of 50 mL/min or more.

“With regard to performance status, blood counts, and creatinine clearance,” Dr Stilgenbauer said, “inclusion criteria were relatively liberal, allowing patients with comorbidity on the trial.”

Patients were excluded if they had prior allogeneic stem cell transplantation, Richter’s transformation, uncontrolled autoimmune cytopenia, other malignancy, or major organ dysfunction.

Trial design

Patients received an oral dose of venetoclax once daily continuously until disease progression or discontinuation for another reason.

Because tumor lysis syndrome (TLS) was a concern, investigators devised a step-wise weekly ramp-up with risk-based prophylaxis to mitigate TLS.

Patients started on a dose of 20 mg on day 1. If they did not experience any electrolyte abnormalities, they received a 50 mg daily dose for the rest of the first week, escalating to 100 mg, 200 mg, and to the target dose of 400 mg daily on subsequent weeks. Patients continued on 400 mg daily for the remainder of the study.

The investigators assessed response using iwCLL 2008 criteria with monthly physical exams and blood counts, CT scans to confirm clinical response at week 36, and a bone marrow biopsy to confirm CR.

Patient population and disposition

Investigators enrolled 107 patients with a median age of 67 (range, 37–85). Seventy (65%) were male.

Patients had a median of 2 prior therapies (range, 1–10): 54 (50%) had prior bendamustine and 38 (70%) were refractory to it; 78 (73%) had prior fludarabine and 34 (44%) were refractory to it; and 90 (84%) had a prior CD20 monoclonal antibody.

About half (52%) were ECOG grade 1, 53% had 1 or more nodes 5 cm or larger, and 51% had absolute lymphocyte (ALC) levels 25 x 10⁹/L or higher.

Eighty-two percent of patients were in the medium and high TLS risk categories, slightly less than half were Rai stage III or IV, and 81% were IGHV unmutated.

As of the data lock on April 30, 2015, patients remained a median of 12.1 months on study (range, 0.03–21.5). Seventy are still active on venetoclax, and 37 discontinued the treatment.

Eleven patients discontinued due to Richter’s transformation, 11 due to CLL progression, and 9 due to adverse events. Three patients proceeded to stem cell transplant, 2 withdrew consent, and 1 was noncompliant.

Eighteen patients died, 14 due to disease progression.

Response

Eighty-five patients responded, for an ORR of 79.4% by IRC. Eight patients (7.5%) achieved a CR or CRi, 3 (2.8%) had an nPR, and 74 (69.2%) had a PR. Twenty-two patients (20.6%) had no response.

Twenty-five of 48 patients had no evidence of CLL in their bone marrow by immunohistochemistry, and 18 of 45 patients assessed were MRD-negative in the peripheral blood.

Reduction in lymphocytosis “was quite a universal phenomenon across this trial,” Dr Stilgenbauer said. Only 4 patients of 87 with baseline lymphocytosis failed to reduce their lymphocyte count to below 4 x 10⁹/L, the usual threshold for a CR. And the median time to normalization was 22 days (range, 2–122).

Eighty-nine of 96 patients had 50% or more reduction in their nodal size in a median of 2.7 months (range, 0.7–8.4).

The median time to first response was 0.8 months (range, 0.1–8.1), and the median time to CR/CRi was 8.2 months (range, 3.0–16.3).

“And this number still appears to evolve over the duration of the trial,” Dr Stilgenbauer said.

The median duration of response has not yet been reached. But investigators estimated that of the 85 responders, 84.7% would maintain their response at 12 months, 100% of patients in the CR/CRi and nPR groups would maintain their response, and 94.4% of patients who were MRD-negative would maintain their response.

The median PFS and OS have not been reached. The PFS estimate for 12 months was 72.0%, and the OS estimate was 86.7%.

Adverse events

Treatment-emergent adverse events of any grade occurred in 96% of patients. The most frequent were neutropenia (43%), diarrhea (29%), nausea (29%), anemia (27%), fatigue (22%), pyrexia (20%), thrombocytopenia (19%), hyperphosphatemia (16%), vomiting (15%), and upper respiratory tract infection (15%).

The most frequent grade 3/4 adverse events were neutropenia (40%), anemia (18%), and thrombocytopenia (15%).

Dr Stilgenbauer pointed out that 22.4% of patients had neutropenia at baseline. Neutropenia was managed with dose interruption or reduction, G-CSF, and/or antibiotics.

Infections occurred in 72% of patients, with 20% of patients experiencing grade 3 or higher.

“The types of infections were the usual expected ones,” Dr Stilgenbauer said.

Laboratory TLS occurred in 5 patients exclusively during the ramp-up period. Two required a dose interruption of 1 day each. There were no clinical TLS events.

Serious adverse events occurred in 55% of patients, the most common being pyrexia (7%), autoimmune hemolytic anemia (7%), pneumonia (6%), and febrile neutropenia (5%).

The investigators concluded that venetoclax offers a favorable risk-benefit profile. The risk of TLS can be effectively mitigated with no clinical TLS, and the incidence of neutropenia and infection are similar to frontline chemoimmunotherapy.

“Venetoclax may provide an attractive treatment option for 17p-deleted CLL as monotherapy or as a component of novel combination strategies,” Dr Stilgenbauer said.

AbbVie and Genentech, collaborators in the development of venetoclax, provided financial support for the study design, study conduct, analysis, data interpretation, writing, and review.

Stephan Stilgenbauer, MD

Photo courtesy of ASH

ORLANDO, FL—The pivotal phase 2 study of venetoclax monotherapy in patients with relapsed/refractory 17p-deleted chronic lymphocytic leukemia (CLL) has achieved unprecedented deep responses, according to investigators.

More than 10% of patients had a complete response (CR), complete response with incomplete blood count recovery (CRi), or near partial response (nPR), as confirmed by an independent review committee (IRC).

And more than 20% of responders became negative for minimal residual disease (MRD).

Venetoclax is an orally bioavailable, selective BCL-2 inhibitor that directly induces apoptosis in CLL cells independent of p53.

The US Food and Drug Administration granted venetoclax breakthrough therapy designation for relapsed/refractory CLL earlier this year.

“Patients with a 17p deletion in CLL have very poor prognosis,” said Stephan Stilgenbauer, MD, of University of Ulm in Germany, “and limited treatment options.”

The median progression-free survival (PFS) with frontline chemoimmunotherapy in this population is less than 12 months.

The first-in-human study of venetoclax, which was recently published in NEJM, showed a 79% overall response rate (ORR) in relapsed/refractory CLL patients.

Dr Stilgenbauer presented the pivotal phase 2 results at the 2015 ASH Annual Meeting as LBA-6.

Study overview

The primary objective of the trial was ORR by independent review committee. The secondary endpoints were CR/PR rates, time to first response, duration of response, PFS, overall survival (OS), and safety.

Investigators also included the exploratory endpoint of MRD as determined by flow cytometry with a sensitivity of less than 10-4.

Patients had to have an ECOG score of 2 or less, an absolute neutrophil count of 1000/μL or greater, a platelet count of 40,000/mm³ or higher, and a hemoglobin count of at least 8 g/dL. They also had to have a creatinine clearance of 50 mL/min or more.

“With regard to performance status, blood counts, and creatinine clearance,” Dr Stilgenbauer said, “inclusion criteria were relatively liberal, allowing patients with comorbidity on the trial.”

Patients were excluded if they had prior allogeneic stem cell transplantation, Richter’s transformation, uncontrolled autoimmune cytopenia, other malignancy, or major organ dysfunction.

Trial design

Patients received an oral dose of venetoclax once daily continuously until disease progression or discontinuation for another reason.

Because tumor lysis syndrome (TLS) was a concern, investigators devised a step-wise weekly ramp-up with risk-based prophylaxis to mitigate TLS.

Patients started on a dose of 20 mg on day 1. If they did not experience any electrolyte abnormalities, they received a 50 mg daily dose for the rest of the first week, escalating to 100 mg, 200 mg, and to the target dose of 400 mg daily on subsequent weeks. Patients continued on 400 mg daily for the remainder of the study.

The investigators assessed response using iwCLL 2008 criteria with monthly physical exams and blood counts, CT scans to confirm clinical response at week 36, and a bone marrow biopsy to confirm CR.

Patient population and disposition

Investigators enrolled 107 patients with a median age of 67 (range, 37–85). Seventy (65%) were male.

Patients had a median of 2 prior therapies (range, 1–10): 54 (50%) had prior bendamustine and 38 (70%) were refractory to it; 78 (73%) had prior fludarabine and 34 (44%) were refractory to it; and 90 (84%) had a prior CD20 monoclonal antibody.

About half (52%) were ECOG grade 1, 53% had 1 or more nodes 5 cm or larger, and 51% had absolute lymphocyte (ALC) levels 25 x 10⁹/L or higher.

Eighty-two percent of patients were in the medium and high TLS risk categories, slightly less than half were Rai stage III or IV, and 81% were IGHV unmutated.

As of the data lock on April 30, 2015, patients remained a median of 12.1 months on study (range, 0.03–21.5). Seventy are still active on venetoclax, and 37 discontinued the treatment.

Eleven patients discontinued due to Richter’s transformation, 11 due to CLL progression, and 9 due to adverse events. Three patients proceeded to stem cell transplant, 2 withdrew consent, and 1 was noncompliant.

Eighteen patients died, 14 due to disease progression.

Response

Eighty-five patients responded, for an ORR of 79.4% by IRC. Eight patients (7.5%) achieved a CR or CRi, 3 (2.8%) had an nPR, and 74 (69.2%) had a PR. Twenty-two patients (20.6%) had no response.

Twenty-five of 48 patients had no evidence of CLL in their bone marrow by immunohistochemistry, and 18 of 45 patients assessed were MRD-negative in the peripheral blood.

Reduction in lymphocytosis “was quite a universal phenomenon across this trial,” Dr Stilgenbauer said. Only 4 patients of 87 with baseline lymphocytosis failed to reduce their lymphocyte count to below 4 x 10⁹/L, the usual threshold for a CR. And the median time to normalization was 22 days (range, 2–122).

Eighty-nine of 96 patients had 50% or more reduction in their nodal size in a median of 2.7 months (range, 0.7–8.4).

The median time to first response was 0.8 months (range, 0.1–8.1), and the median time to CR/CRi was 8.2 months (range, 3.0–16.3).

“And this number still appears to evolve over the duration of the trial,” Dr Stilgenbauer said.

The median duration of response has not yet been reached. But investigators estimated that of the 85 responders, 84.7% would maintain their response at 12 months, 100% of patients in the CR/CRi and nPR groups would maintain their response, and 94.4% of patients who were MRD-negative would maintain their response.

The median PFS and OS have not been reached. The PFS estimate for 12 months was 72.0%, and the OS estimate was 86.7%.

Adverse events

Treatment-emergent adverse events of any grade occurred in 96% of patients. The most frequent were neutropenia (43%), diarrhea (29%), nausea (29%), anemia (27%), fatigue (22%), pyrexia (20%), thrombocytopenia (19%), hyperphosphatemia (16%), vomiting (15%), and upper respiratory tract infection (15%).

The most frequent grade 3/4 adverse events were neutropenia (40%), anemia (18%), and thrombocytopenia (15%).

Dr Stilgenbauer pointed out that 22.4% of patients had neutropenia at baseline. Neutropenia was managed with dose interruption or reduction, G-CSF, and/or antibiotics.

Infections occurred in 72% of patients, with 20% of patients experiencing grade 3 or higher.

“The types of infections were the usual expected ones,” Dr Stilgenbauer said.

Laboratory TLS occurred in 5 patients exclusively during the ramp-up period. Two required a dose interruption of 1 day each. There were no clinical TLS events.

Serious adverse events occurred in 55% of patients, the most common being pyrexia (7%), autoimmune hemolytic anemia (7%), pneumonia (6%), and febrile neutropenia (5%).

The investigators concluded that venetoclax offers a favorable risk-benefit profile. The risk of TLS can be effectively mitigated with no clinical TLS, and the incidence of neutropenia and infection are similar to frontline chemoimmunotherapy.

“Venetoclax may provide an attractive treatment option for 17p-deleted CLL as monotherapy or as a component of novel combination strategies,” Dr Stilgenbauer said.

AbbVie and Genentech, collaborators in the development of venetoclax, provided financial support for the study design, study conduct, analysis, data interpretation, writing, and review.

Stephan Stilgenbauer, MD

Photo courtesy of ASH

ORLANDO, FL—The pivotal phase 2 study of venetoclax monotherapy in patients with relapsed/refractory 17p-deleted chronic lymphocytic leukemia (CLL) has achieved unprecedented deep responses, according to investigators.

More than 10% of patients had a complete response (CR), complete response with incomplete blood count recovery (CRi), or near partial response (nPR), as confirmed by an independent review committee (IRC).

And more than 20% of responders became negative for minimal residual disease (MRD).

Venetoclax is an orally bioavailable, selective BCL-2 inhibitor that directly induces apoptosis in CLL cells independent of p53.

The US Food and Drug Administration granted venetoclax breakthrough therapy designation for relapsed/refractory CLL earlier this year.

“Patients with a 17p deletion in CLL have very poor prognosis,” said Stephan Stilgenbauer, MD, of University of Ulm in Germany, “and limited treatment options.”

The median progression-free survival (PFS) with frontline chemoimmunotherapy in this population is less than 12 months.

The first-in-human study of venetoclax, which was recently published in NEJM, showed a 79% overall response rate (ORR) in relapsed/refractory CLL patients.

Dr Stilgenbauer presented the pivotal phase 2 results at the 2015 ASH Annual Meeting as LBA-6.

Study overview

The primary objective of the trial was ORR by independent review committee. The secondary endpoints were CR/PR rates, time to first response, duration of response, PFS, overall survival (OS), and safety.

Investigators also included the exploratory endpoint of MRD as determined by flow cytometry with a sensitivity of less than 10-4.

Patients had to have an ECOG score of 2 or less, an absolute neutrophil count of 1000/μL or greater, a platelet count of 40,000/mm³ or higher, and a hemoglobin count of at least 8 g/dL. They also had to have a creatinine clearance of 50 mL/min or more.

“With regard to performance status, blood counts, and creatinine clearance,” Dr Stilgenbauer said, “inclusion criteria were relatively liberal, allowing patients with comorbidity on the trial.”

Patients were excluded if they had prior allogeneic stem cell transplantation, Richter’s transformation, uncontrolled autoimmune cytopenia, other malignancy, or major organ dysfunction.

Trial design

Patients received an oral dose of venetoclax once daily continuously until disease progression or discontinuation for another reason.

Because tumor lysis syndrome (TLS) was a concern, investigators devised a step-wise weekly ramp-up with risk-based prophylaxis to mitigate TLS.

Patients started on a dose of 20 mg on day 1. If they did not experience any electrolyte abnormalities, they received a 50 mg daily dose for the rest of the first week, escalating to 100 mg, 200 mg, and to the target dose of 400 mg daily on subsequent weeks. Patients continued on 400 mg daily for the remainder of the study.

The investigators assessed response using iwCLL 2008 criteria with monthly physical exams and blood counts, CT scans to confirm clinical response at week 36, and a bone marrow biopsy to confirm CR.

Patient population and disposition

Investigators enrolled 107 patients with a median age of 67 (range, 37–85). Seventy (65%) were male.

Patients had a median of 2 prior therapies (range, 1–10): 54 (50%) had prior bendamustine and 38 (70%) were refractory to it; 78 (73%) had prior fludarabine and 34 (44%) were refractory to it; and 90 (84%) had a prior CD20 monoclonal antibody.

About half (52%) were ECOG grade 1, 53% had 1 or more nodes 5 cm or larger, and 51% had absolute lymphocyte (ALC) levels 25 x 10⁹/L or higher.

Eighty-two percent of patients were in the medium and high TLS risk categories, slightly less than half were Rai stage III or IV, and 81% were IGHV unmutated.

As of the data lock on April 30, 2015, patients remained a median of 12.1 months on study (range, 0.03–21.5). Seventy are still active on venetoclax, and 37 discontinued the treatment.

Eleven patients discontinued due to Richter’s transformation, 11 due to CLL progression, and 9 due to adverse events. Three patients proceeded to stem cell transplant, 2 withdrew consent, and 1 was noncompliant.

Eighteen patients died, 14 due to disease progression.

Response

Eighty-five patients responded, for an ORR of 79.4% by IRC. Eight patients (7.5%) achieved a CR or CRi, 3 (2.8%) had an nPR, and 74 (69.2%) had a PR. Twenty-two patients (20.6%) had no response.

Twenty-five of 48 patients had no evidence of CLL in their bone marrow by immunohistochemistry, and 18 of 45 patients assessed were MRD-negative in the peripheral blood.

Reduction in lymphocytosis “was quite a universal phenomenon across this trial,” Dr Stilgenbauer said. Only 4 patients of 87 with baseline lymphocytosis failed to reduce their lymphocyte count to below 4 x 10⁹/L, the usual threshold for a CR. And the median time to normalization was 22 days (range, 2–122).

Eighty-nine of 96 patients had 50% or more reduction in their nodal size in a median of 2.7 months (range, 0.7–8.4).

The median time to first response was 0.8 months (range, 0.1–8.1), and the median time to CR/CRi was 8.2 months (range, 3.0–16.3).

“And this number still appears to evolve over the duration of the trial,” Dr Stilgenbauer said.

The median duration of response has not yet been reached. But investigators estimated that of the 85 responders, 84.7% would maintain their response at 12 months, 100% of patients in the CR/CRi and nPR groups would maintain their response, and 94.4% of patients who were MRD-negative would maintain their response.

The median PFS and OS have not been reached. The PFS estimate for 12 months was 72.0%, and the OS estimate was 86.7%.

Adverse events

Treatment-emergent adverse events of any grade occurred in 96% of patients. The most frequent were neutropenia (43%), diarrhea (29%), nausea (29%), anemia (27%), fatigue (22%), pyrexia (20%), thrombocytopenia (19%), hyperphosphatemia (16%), vomiting (15%), and upper respiratory tract infection (15%).

The most frequent grade 3/4 adverse events were neutropenia (40%), anemia (18%), and thrombocytopenia (15%).

Dr Stilgenbauer pointed out that 22.4% of patients had neutropenia at baseline. Neutropenia was managed with dose interruption or reduction, G-CSF, and/or antibiotics.

Infections occurred in 72% of patients, with 20% of patients experiencing grade 3 or higher.

“The types of infections were the usual expected ones,” Dr Stilgenbauer said.

Laboratory TLS occurred in 5 patients exclusively during the ramp-up period. Two required a dose interruption of 1 day each. There were no clinical TLS events.

Serious adverse events occurred in 55% of patients, the most common being pyrexia (7%), autoimmune hemolytic anemia (7%), pneumonia (6%), and febrile neutropenia (5%).

The investigators concluded that venetoclax offers a favorable risk-benefit profile. The risk of TLS can be effectively mitigated with no clinical TLS, and the incidence of neutropenia and infection are similar to frontline chemoimmunotherapy.

“Venetoclax may provide an attractive treatment option for 17p-deleted CLL as monotherapy or as a component of novel combination strategies,” Dr Stilgenbauer said.

AbbVie and Genentech, collaborators in the development of venetoclax, provided financial support for the study design, study conduct, analysis, data interpretation, writing, and review.

Attendees at ASH 2015

Photo courtesy of ASH

ORLANDO, FL—Investigators have observed early fulminant hepatotoxicity in a subset of primarily younger chronic lymphocytic leukemia (CLL) patients treated with idelalisib monotherapy in the frontline setting.

In a phase 2 study of idelalisib plus ofatumumab, 52% of the 24 patients enrolled experienced grade 3 or higher hepatotoxicity shortly after idelalisib was started.

The investigators say this may occur because a proportion of regulatory T cells in the peripheral blood decreases while patients are on idelalisib. The team believes this early hepatotoxicity is immune-mediated.

Benjamin Lampson, MD, PhD, of the Dana-Farber Cancer Institute in Boston, Massachusetts, described these surprising findings at the 2015 ASH Annual Meeting as abstract 497.*

Study design and patient demographics

Patients received 150 mg of idelalisib twice daily as monotherapy on days 1 through 56. They then received combination therapy with idelalisib plus ofatumumab for 8 weekly infusions, followed by 4 monthly infusions through day 225, and then idelalisib monotherapy indefinitely.

The primary endpoint of overall response rate was assessed 2 months after the completion of combination therapy.

“This dosing strategy is slightly different than what has been previously used in trials combining these particular drugs,” Dr Lampson said. “Specifically, previously reported trials started these agents simultaneously without a lead-in period of monotherapy.”

The investigators monitored the patients weekly for toxicities during the 2-month monotherapy lead-in period.

Three-quarters of the patients are male. Their median age is 67.4 years (range, 57.6–84.9), 54% have unmutated IgHV, 17% have deletion 17p or TP53 mutation, 4% have deletion 11q, and 54% have deletion 13q.

The patients received no prior therapies.

Results

The trial is currently ongoing.

The 24 patients enrolled as of early November have been on therapy a median of 7.7 months, for a median follow-up time of 14.7 months.

“What we began to notice after enrolling just a few subjects on the trial was that severe hepatotoxicity was occurring shortly after initiating idelalisib,” Dr Lampson said.

In the first 2 months of therapy, 52% of patients developed transaminitis, and 13% developed colitis or diarrhea, all grade 3 or higher. Thirteen percent developed pneumonitis of any grade.

Younger age is a risk factor for early hepatotoxicity, Dr Lampson said, with a significance of P=0.02. All subjects age 65 or younger (n=7) required systemic steroids to treat their toxicities.

Hepatotoxicity developed in a median of 28 days, he said, “and the hepatotoxicity is typically occurring before the first dose of ofatumumab is administered at week 8, suggesting that idelalisib alone is the cause of the hepatotoxicity.”

Dr Lampson noted that toxicities resolved rapidly with steroids.

“I do want to point out that all subjects evaluable for a response have had a response,” he added. “Additionally, in all subjects where treatment has been discontinued, the discontinuation was due to adverse events rather than disease progression.”

Twelve patients with grade 2 or higher transaminitis were re-challenged with idelalisib after holding the drug for toxicity.

Five patients were re-challenged while off steroids, and 4 developed recurrent transaminitis within 4 days. Seven patients were re-challenged while on steroids, and 2 developed recurrent transaminitis within 4 days.

“In general, our experience has been, if idelalisib is resumed while the subject remains on steroids, the drug is more likely to be tolerated and the subject can eventually be taken off steroids,” Dr Lampson said.

Comparison with earlier studies

The investigators compared the frequency of toxicity in their trial to earlier studies of idelalisib (Brown, Blood 2014; Coutre, EHA 2015, abstr P588; O’Brien, Blood 2015).

They found that grade 3 or higher transaminitis (52%) and any grade pneumonitis (13%) were higher in their trial than in the 3 other trials.

Colitis/diarrhea was about the same in 2 of the 3 other trials. But in the paper by O’Brien et al, 42% of patients experienced grade 3 or greater colitis/diarrhea.

The lower rate of colitis in the present trial may be due to the shorter follow-up, Dr Lampson said, as colitis is a late adverse event.

The O’Brien trial was also an upfront study, so patients had no prior therapies. The investigators observed that toxicities appeared to be more common in less heavily pretreated patients.

“As the median number of prior therapies decreases,” Dr Lampson said, “the frequency of adverse events increases.”

He noted that, in the O’Brien trial, idelalisib was started simultaneously with the other drugs, perhaps accounting for its somewhat lower rate (21%) of grade 3 or higher transaminitis.

Additionally, the patient population in the O’Brien trial was older than the population in the current trial, which could account for the higher rate of transaminitis, as younger age is a risk factor.

Decrease in regulatory T cells

Investigators noted a decrease in regulatory T cells while patients were on therapy. Eleven of 15 patients (73%) with matched samples had a significant (P<0.05) decrease in the percentage of T cells over time.

This, they say, could provide a possible explanation for the development of early hepatotoxicity.

The trial is investigator-initiated and funded by Gilead Sciences.

*Data in the presentation differs from the abstract.

Attendees at ASH 2015

Photo courtesy of ASH

ORLANDO, FL—Investigators have observed early fulminant hepatotoxicity in a subset of primarily younger chronic lymphocytic leukemia (CLL) patients treated with idelalisib monotherapy in the frontline setting.

In a phase 2 study of idelalisib plus ofatumumab, 52% of the 24 patients enrolled experienced grade 3 or higher hepatotoxicity shortly after idelalisib was started.

The investigators say this may occur because a proportion of regulatory T cells in the peripheral blood decreases while patients are on idelalisib. The team believes this early hepatotoxicity is immune-mediated.

Benjamin Lampson, MD, PhD, of the Dana-Farber Cancer Institute in Boston, Massachusetts, described these surprising findings at the 2015 ASH Annual Meeting as abstract 497.*

Study design and patient demographics

Patients received 150 mg of idelalisib twice daily as monotherapy on days 1 through 56. They then received combination therapy with idelalisib plus ofatumumab for 8 weekly infusions, followed by 4 monthly infusions through day 225, and then idelalisib monotherapy indefinitely.

The primary endpoint of overall response rate was assessed 2 months after the completion of combination therapy.

“This dosing strategy is slightly different than what has been previously used in trials combining these particular drugs,” Dr Lampson said. “Specifically, previously reported trials started these agents simultaneously without a lead-in period of monotherapy.”

The investigators monitored the patients weekly for toxicities during the 2-month monotherapy lead-in period.

Three-quarters of the patients are male. Their median age is 67.4 years (range, 57.6–84.9), 54% have unmutated IgHV, 17% have deletion 17p or TP53 mutation, 4% have deletion 11q, and 54% have deletion 13q.

The patients received no prior therapies.

Results

The trial is currently ongoing.

The 24 patients enrolled as of early November have been on therapy a median of 7.7 months, for a median follow-up time of 14.7 months.

“What we began to notice after enrolling just a few subjects on the trial was that severe hepatotoxicity was occurring shortly after initiating idelalisib,” Dr Lampson said.

In the first 2 months of therapy, 52% of patients developed transaminitis, and 13% developed colitis or diarrhea, all grade 3 or higher. Thirteen percent developed pneumonitis of any grade.

Younger age is a risk factor for early hepatotoxicity, Dr Lampson said, with a significance of P=0.02. All subjects age 65 or younger (n=7) required systemic steroids to treat their toxicities.

Hepatotoxicity developed in a median of 28 days, he said, “and the hepatotoxicity is typically occurring before the first dose of ofatumumab is administered at week 8, suggesting that idelalisib alone is the cause of the hepatotoxicity.”

Dr Lampson noted that toxicities resolved rapidly with steroids.

“I do want to point out that all subjects evaluable for a response have had a response,” he added. “Additionally, in all subjects where treatment has been discontinued, the discontinuation was due to adverse events rather than disease progression.”

Twelve patients with grade 2 or higher transaminitis were re-challenged with idelalisib after holding the drug for toxicity.

Five patients were re-challenged while off steroids, and 4 developed recurrent transaminitis within 4 days. Seven patients were re-challenged while on steroids, and 2 developed recurrent transaminitis within 4 days.

“In general, our experience has been, if idelalisib is resumed while the subject remains on steroids, the drug is more likely to be tolerated and the subject can eventually be taken off steroids,” Dr Lampson said.

Comparison with earlier studies

The investigators compared the frequency of toxicity in their trial to earlier studies of idelalisib (Brown, Blood 2014; Coutre, EHA 2015, abstr P588; O’Brien, Blood 2015).

They found that grade 3 or higher transaminitis (52%) and any grade pneumonitis (13%) were higher in their trial than in the 3 other trials.

Colitis/diarrhea was about the same in 2 of the 3 other trials. But in the paper by O’Brien et al, 42% of patients experienced grade 3 or greater colitis/diarrhea.

The lower rate of colitis in the present trial may be due to the shorter follow-up, Dr Lampson said, as colitis is a late adverse event.

The O’Brien trial was also an upfront study, so patients had no prior therapies. The investigators observed that toxicities appeared to be more common in less heavily pretreated patients.

“As the median number of prior therapies decreases,” Dr Lampson said, “the frequency of adverse events increases.”

He noted that, in the O’Brien trial, idelalisib was started simultaneously with the other drugs, perhaps accounting for its somewhat lower rate (21%) of grade 3 or higher transaminitis.

Additionally, the patient population in the O’Brien trial was older than the population in the current trial, which could account for the higher rate of transaminitis, as younger age is a risk factor.

Decrease in regulatory T cells

Investigators noted a decrease in regulatory T cells while patients were on therapy. Eleven of 15 patients (73%) with matched samples had a significant (P<0.05) decrease in the percentage of T cells over time.

This, they say, could provide a possible explanation for the development of early hepatotoxicity.

The trial is investigator-initiated and funded by Gilead Sciences.

*Data in the presentation differs from the abstract.

Attendees at ASH 2015

Photo courtesy of ASH

ORLANDO, FL—Investigators have observed early fulminant hepatotoxicity in a subset of primarily younger chronic lymphocytic leukemia (CLL) patients treated with idelalisib monotherapy in the frontline setting.

In a phase 2 study of idelalisib plus ofatumumab, 52% of the 24 patients enrolled experienced grade 3 or higher hepatotoxicity shortly after idelalisib was started.

The investigators say this may occur because a proportion of regulatory T cells in the peripheral blood decreases while patients are on idelalisib. The team believes this early hepatotoxicity is immune-mediated.

Benjamin Lampson, MD, PhD, of the Dana-Farber Cancer Institute in Boston, Massachusetts, described these surprising findings at the 2015 ASH Annual Meeting as abstract 497.*

Study design and patient demographics

Patients received 150 mg of idelalisib twice daily as monotherapy on days 1 through 56. They then received combination therapy with idelalisib plus ofatumumab for 8 weekly infusions, followed by 4 monthly infusions through day 225, and then idelalisib monotherapy indefinitely.

The primary endpoint of overall response rate was assessed 2 months after the completion of combination therapy.

“This dosing strategy is slightly different than what has been previously used in trials combining these particular drugs,” Dr Lampson said. “Specifically, previously reported trials started these agents simultaneously without a lead-in period of monotherapy.”

The investigators monitored the patients weekly for toxicities during the 2-month monotherapy lead-in period.

Three-quarters of the patients are male. Their median age is 67.4 years (range, 57.6–84.9), 54% have unmutated IgHV, 17% have deletion 17p or TP53 mutation, 4% have deletion 11q, and 54% have deletion 13q.

The patients received no prior therapies.

Results

The trial is currently ongoing.

The 24 patients enrolled as of early November have been on therapy a median of 7.7 months, for a median follow-up time of 14.7 months.

“What we began to notice after enrolling just a few subjects on the trial was that severe hepatotoxicity was occurring shortly after initiating idelalisib,” Dr Lampson said.

In the first 2 months of therapy, 52% of patients developed transaminitis, and 13% developed colitis or diarrhea, all grade 3 or higher. Thirteen percent developed pneumonitis of any grade.

Younger age is a risk factor for early hepatotoxicity, Dr Lampson said, with a significance of P=0.02. All subjects age 65 or younger (n=7) required systemic steroids to treat their toxicities.

Hepatotoxicity developed in a median of 28 days, he said, “and the hepatotoxicity is typically occurring before the first dose of ofatumumab is administered at week 8, suggesting that idelalisib alone is the cause of the hepatotoxicity.”

Dr Lampson noted that toxicities resolved rapidly with steroids.

“I do want to point out that all subjects evaluable for a response have had a response,” he added. “Additionally, in all subjects where treatment has been discontinued, the discontinuation was due to adverse events rather than disease progression.”

Twelve patients with grade 2 or higher transaminitis were re-challenged with idelalisib after holding the drug for toxicity.

Five patients were re-challenged while off steroids, and 4 developed recurrent transaminitis within 4 days. Seven patients were re-challenged while on steroids, and 2 developed recurrent transaminitis within 4 days.

“In general, our experience has been, if idelalisib is resumed while the subject remains on steroids, the drug is more likely to be tolerated and the subject can eventually be taken off steroids,” Dr Lampson said.

Comparison with earlier studies

The investigators compared the frequency of toxicity in their trial to earlier studies of idelalisib (Brown, Blood 2014; Coutre, EHA 2015, abstr P588; O’Brien, Blood 2015).

They found that grade 3 or higher transaminitis (52%) and any grade pneumonitis (13%) were higher in their trial than in the 3 other trials.

Colitis/diarrhea was about the same in 2 of the 3 other trials. But in the paper by O’Brien et al, 42% of patients experienced grade 3 or greater colitis/diarrhea.

The lower rate of colitis in the present trial may be due to the shorter follow-up, Dr Lampson said, as colitis is a late adverse event.

The O’Brien trial was also an upfront study, so patients had no prior therapies. The investigators observed that toxicities appeared to be more common in less heavily pretreated patients.

“As the median number of prior therapies decreases,” Dr Lampson said, “the frequency of adverse events increases.”

He noted that, in the O’Brien trial, idelalisib was started simultaneously with the other drugs, perhaps accounting for its somewhat lower rate (21%) of grade 3 or higher transaminitis.

Additionally, the patient population in the O’Brien trial was older than the population in the current trial, which could account for the higher rate of transaminitis, as younger age is a risk factor.

Decrease in regulatory T cells

Investigators noted a decrease in regulatory T cells while patients were on therapy. Eleven of 15 patients (73%) with matched samples had a significant (P<0.05) decrease in the percentage of T cells over time.

This, they say, could provide a possible explanation for the development of early hepatotoxicity.

The trial is investigator-initiated and funded by Gilead Sciences.

*Data in the presentation differs from the abstract.

Genome sequencing

Photo courtesy of NIGMS

Researchers say they have identified substantial differences in the procedures and quality of cancer genome sequencing between sequencing centers.

And this led to dramatic discrepancies in the number and types of somatic mutations detected when using the same cancer genome sequences for analysis.

The group’s study involved 83 researchers from 78 institutions participating in the International Cancer Genomics Consortium (ICGC).

The ICGC is an international effort to establish a comprehensive description of genomic, transcriptomic, and epigenomic changes in 50 different tumor types and/or subtypes that are thought to be of clinical and societal importance across the globe.

The consortium is characterizing more than 25,000 cancer genomes and carrying out 78 projects supported by different national and international funding agencies.

For the current project, which was published in Nature Communications, researchers studied a patient with chronic lymphocytic leukemia and a patient with medulloblastoma.

The team analyzed the entire tumor genome of each patient and compared it to the normal genome of the same patient to decipher the molecular causes for these cancers.

The researchers said they saw “widely varying mutation call rates and low concordance among analysis pipelines.”

So they established a reference mutation dataset to assess analytical procedures. They said this “gold-set” reference database has helped the ICGC community improve procedures for identifying more true somatic mutations in cancer genomes and making fewer false-positive calls.

“The findings of our study have far-reaching implications for cancer genome analysis,” said Ivo Gut, of Centro Nacional de Analisis Genómico in Barcelona, Spain.

“We have found many inconsistencies in both the sequencing of cancer genomes and the data analysis at different sites. We are making our findings available to the scientific and diagnostic community so that they can improve their systems and generate more standardized and consistent results.”

Genome sequencing

Photo courtesy of NIGMS

Researchers say they have identified substantial differences in the procedures and quality of cancer genome sequencing between sequencing centers.

And this led to dramatic discrepancies in the number and types of somatic mutations detected when using the same cancer genome sequences for analysis.

The group’s study involved 83 researchers from 78 institutions participating in the International Cancer Genomics Consortium (ICGC).

The ICGC is an international effort to establish a comprehensive description of genomic, transcriptomic, and epigenomic changes in 50 different tumor types and/or subtypes that are thought to be of clinical and societal importance across the globe.

The consortium is characterizing more than 25,000 cancer genomes and carrying out 78 projects supported by different national and international funding agencies.

For the current project, which was published in Nature Communications, researchers studied a patient with chronic lymphocytic leukemia and a patient with medulloblastoma.

The team analyzed the entire tumor genome of each patient and compared it to the normal genome of the same patient to decipher the molecular causes for these cancers.

The researchers said they saw “widely varying mutation call rates and low concordance among analysis pipelines.”

So they established a reference mutation dataset to assess analytical procedures. They said this “gold-set” reference database has helped the ICGC community improve procedures for identifying more true somatic mutations in cancer genomes and making fewer false-positive calls.

“The findings of our study have far-reaching implications for cancer genome analysis,” said Ivo Gut, of Centro Nacional de Analisis Genómico in Barcelona, Spain.

“We have found many inconsistencies in both the sequencing of cancer genomes and the data analysis at different sites. We are making our findings available to the scientific and diagnostic community so that they can improve their systems and generate more standardized and consistent results.”

Genome sequencing

Photo courtesy of NIGMS

Researchers say they have identified substantial differences in the procedures and quality of cancer genome sequencing between sequencing centers.

And this led to dramatic discrepancies in the number and types of somatic mutations detected when using the same cancer genome sequences for analysis.

The group’s study involved 83 researchers from 78 institutions participating in the International Cancer Genomics Consortium (ICGC).

The ICGC is an international effort to establish a comprehensive description of genomic, transcriptomic, and epigenomic changes in 50 different tumor types and/or subtypes that are thought to be of clinical and societal importance across the globe.

The consortium is characterizing more than 25,000 cancer genomes and carrying out 78 projects supported by different national and international funding agencies.

For the current project, which was published in Nature Communications, researchers studied a patient with chronic lymphocytic leukemia and a patient with medulloblastoma.

The team analyzed the entire tumor genome of each patient and compared it to the normal genome of the same patient to decipher the molecular causes for these cancers.

The researchers said they saw “widely varying mutation call rates and low concordance among analysis pipelines.”

So they established a reference mutation dataset to assess analytical procedures. They said this “gold-set” reference database has helped the ICGC community improve procedures for identifying more true somatic mutations in cancer genomes and making fewer false-positive calls.

“The findings of our study have far-reaching implications for cancer genome analysis,” said Ivo Gut, of Centro Nacional de Analisis Genómico in Barcelona, Spain.

“We have found many inconsistencies in both the sequencing of cancer genomes and the data analysis at different sites. We are making our findings available to the scientific and diagnostic community so that they can improve their systems and generate more standardized and consistent results.”

The past few decades have witnessed unprecedented advances in our understanding of the molecular underpinnings of cancer. Although indiscriminately cytotoxic therapies like chemo- and radiation therapy remain standard of care for many cancer types, more precise targeted therapies and immune-boosting immunotherapies have added to our arsenal and afforded considerable survival gains. Despite those advances, we are still no closer to a cure, particularly for the most aggressive and insidious cancers that progress rapidly or go undiagnosed until advanced stages of disease. The substantial genetic diversity of tumors and universal nature of drug resistance present the most formidable and enduring challenges to effective cancer treatment. 

Click on the PDF icon at the top of this introduction to read the full article.

The past few decades have witnessed unprecedented advances in our understanding of the molecular underpinnings of cancer. Although indiscriminately cytotoxic therapies like chemo- and radiation therapy remain standard of care for many cancer types, more precise targeted therapies and immune-boosting immunotherapies have added to our arsenal and afforded considerable survival gains. Despite those advances, we are still no closer to a cure, particularly for the most aggressive and insidious cancers that progress rapidly or go undiagnosed until advanced stages of disease. The substantial genetic diversity of tumors and universal nature of drug resistance present the most formidable and enduring challenges to effective cancer treatment. 

Click on the PDF icon at the top of this introduction to read the full article.

The past few decades have witnessed unprecedented advances in our understanding of the molecular underpinnings of cancer. Although indiscriminately cytotoxic therapies like chemo- and radiation therapy remain standard of care for many cancer types, more precise targeted therapies and immune-boosting immunotherapies have added to our arsenal and afforded considerable survival gains. Despite those advances, we are still no closer to a cure, particularly for the most aggressive and insidious cancers that progress rapidly or go undiagnosed until advanced stages of disease. The substantial genetic diversity of tumors and universal nature of drug resistance present the most formidable and enduring challenges to effective cancer treatment. 

Click on the PDF icon at the top of this introduction to read the full article.

Women who become pregnant while in remission from Hodgkin lymphoma were not at increased risk for cancer relapse, according to an analysis of data from Swedish health care registries combined with medical records.

Of 449 women who were diagnosed with Hodgkin lymphoma between 1992 and 2009, 144 (32%) became pregnant during follow-up, which started 6 months after diagnosis, when the disease was assumed to be in remission. Only one of these women experienced a pregnancy-associated relapse, which was defined as a relapse occurring during pregnancy or within 5 years of delivery. Of the women who did not become pregnant, 46 had a relapse.

©Jupiterimages/thinkstockphotos.com

The effect of pregnancy on relapse has been a concern of patients and clinicians, but “our findings suggest that the risk of pregnancy-associated relapse does not need to be taken into account in family planning for women whose Hodgkin lymphoma is in remission,” said Caroline E. Weibull of Karolinska Institutet in Stockholm, and her associates.

The researchers used the nationwide “Swedish Cancer Register” to identify all cases of Hodgkin lymphoma (reporting is mandatory) and merged this data with clinical information from other registries and medical records.

The pregnancy rates were similar among women who had limited- and advanced-stage disease and among women with and without B symptoms at diagnosis – a finding that negates consideration of a so-called “healthy mother effect” in protecting against relapse, they wrote (J Clin Onc. 2015 Dec. 14 [doi:10.1200/JCO.2015.63.3446]).

The researchers also found that the absolute risk for relapse was highest in the first 2-3 years after diagnosis, which suggests that women should be advised, “if possible, to wait 2 years after cessation of treatment before becoming pregnant.” Additionally, the relapse rate more than doubled in women aged 30 years or older at diagnosis, compared with women aged 18-24 years at diagnosis – a finding consistent with previous research, they noted.

Women in the study were aged 18-40 at diagnosis. Follow-up ended on the date of relapse, the date of death, or at the end of 2010, whichever came first.

Women who become pregnant while in remission from Hodgkin lymphoma were not at increased risk for cancer relapse, according to an analysis of data from Swedish health care registries combined with medical records.

Of 449 women who were diagnosed with Hodgkin lymphoma between 1992 and 2009, 144 (32%) became pregnant during follow-up, which started 6 months after diagnosis, when the disease was assumed to be in remission. Only one of these women experienced a pregnancy-associated relapse, which was defined as a relapse occurring during pregnancy or within 5 years of delivery. Of the women who did not become pregnant, 46 had a relapse.

©Jupiterimages/thinkstockphotos.com

The effect of pregnancy on relapse has been a concern of patients and clinicians, but “our findings suggest that the risk of pregnancy-associated relapse does not need to be taken into account in family planning for women whose Hodgkin lymphoma is in remission,” said Caroline E. Weibull of Karolinska Institutet in Stockholm, and her associates.

The researchers used the nationwide “Swedish Cancer Register” to identify all cases of Hodgkin lymphoma (reporting is mandatory) and merged this data with clinical information from other registries and medical records.

The pregnancy rates were similar among women who had limited- and advanced-stage disease and among women with and without B symptoms at diagnosis – a finding that negates consideration of a so-called “healthy mother effect” in protecting against relapse, they wrote (J Clin Onc. 2015 Dec. 14 [doi:10.1200/JCO.2015.63.3446]).

The researchers also found that the absolute risk for relapse was highest in the first 2-3 years after diagnosis, which suggests that women should be advised, “if possible, to wait 2 years after cessation of treatment before becoming pregnant.” Additionally, the relapse rate more than doubled in women aged 30 years or older at diagnosis, compared with women aged 18-24 years at diagnosis – a finding consistent with previous research, they noted.

Women in the study were aged 18-40 at diagnosis. Follow-up ended on the date of relapse, the date of death, or at the end of 2010, whichever came first.

Women who become pregnant while in remission from Hodgkin lymphoma were not at increased risk for cancer relapse, according to an analysis of data from Swedish health care registries combined with medical records.

Of 449 women who were diagnosed with Hodgkin lymphoma between 1992 and 2009, 144 (32%) became pregnant during follow-up, which started 6 months after diagnosis, when the disease was assumed to be in remission. Only one of these women experienced a pregnancy-associated relapse, which was defined as a relapse occurring during pregnancy or within 5 years of delivery. Of the women who did not become pregnant, 46 had a relapse.

©Jupiterimages/thinkstockphotos.com

The effect of pregnancy on relapse has been a concern of patients and clinicians, but “our findings suggest that the risk of pregnancy-associated relapse does not need to be taken into account in family planning for women whose Hodgkin lymphoma is in remission,” said Caroline E. Weibull of Karolinska Institutet in Stockholm, and her associates.

The researchers used the nationwide “Swedish Cancer Register” to identify all cases of Hodgkin lymphoma (reporting is mandatory) and merged this data with clinical information from other registries and medical records.

The pregnancy rates were similar among women who had limited- and advanced-stage disease and among women with and without B symptoms at diagnosis – a finding that negates consideration of a so-called “healthy mother effect” in protecting against relapse, they wrote (J Clin Onc. 2015 Dec. 14 [doi:10.1200/JCO.2015.63.3446]).

The researchers also found that the absolute risk for relapse was highest in the first 2-3 years after diagnosis, which suggests that women should be advised, “if possible, to wait 2 years after cessation of treatment before becoming pregnant.” Additionally, the relapse rate more than doubled in women aged 30 years or older at diagnosis, compared with women aged 18-24 years at diagnosis – a finding consistent with previous research, they noted.

Women in the study were aged 18-40 at diagnosis. Follow-up ended on the date of relapse, the date of death, or at the end of 2010, whichever came first.

The past year has been an exciting one for new oncology and hematology drug approvals and the continued evolution of our oncology delivery system toward high quality and value. In all, at press time in mid-November, the US Food and Drug Administration (FDA) had approved or granted expanded indications for 24 drugs, compared with 19 in the 2 preceding years. Of those 24 approvals, 7 were accelerated and 6 were expanded approvals, and 3 alone were for the immunotherapeutic drug, nivolumab – 2 for non-small-cell lung cancer (NSCLC) and 1 for metastatic melanoma.

Click on the PDF icon at the top of this introduction to read the full article.

The past year has been an exciting one for new oncology and hematology drug approvals and the continued evolution of our oncology delivery system toward high quality and value. In all, at press time in mid-November, the US Food and Drug Administration (FDA) had approved or granted expanded indications for 24 drugs, compared with 19 in the 2 preceding years. Of those 24 approvals, 7 were accelerated and 6 were expanded approvals, and 3 alone were for the immunotherapeutic drug, nivolumab – 2 for non-small-cell lung cancer (NSCLC) and 1 for metastatic melanoma.

Click on the PDF icon at the top of this introduction to read the full article.

The past year has been an exciting one for new oncology and hematology drug approvals and the continued evolution of our oncology delivery system toward high quality and value. In all, at press time in mid-November, the US Food and Drug Administration (FDA) had approved or granted expanded indications for 24 drugs, compared with 19 in the 2 preceding years. Of those 24 approvals, 7 were accelerated and 6 were expanded approvals, and 3 alone were for the immunotherapeutic drug, nivolumab – 2 for non-small-cell lung cancer (NSCLC) and 1 for metastatic melanoma.

Click on the PDF icon at the top of this introduction to read the full article.

Attendees meet in Orlando

Photo courtesy of ASH

ORLANDO, FL—Idelalisib, the first-in-class PI3Kδ inhibitor, combined with bendamustine and rituximab (BR) for relapsed/refractory chronic

lymphocytic leukemia (CLL) offers “an important new option over the standard of care,” according to Andrew Zelenetz, MD, a member of the

international research team that conducted the phase 3 study of this combination.

Patients who received idelalisib plus BR experienced a much longer progression-free survival (PFS) than those who received BR alone, 23.1

months versus 11.1 months, respectively.

“And the benefit was seen across risk groups,” Dr Zelenetz said.

He pointed out that the trial was stopped early in October because of the “overwhelming benefit” of idelalisib compared to the conventional therapy arm.

Dr Zelenetz, of Memorial Sloan Kettering Cancer Center in New York, New York, presented the findings at the 2015 ASH Annual Meeting as LBA-5.

Idelalisib had already been approved by the US Food and Drug Administration for the treatment of relapsed/refractory CLL.

“Many people refer to this [idelalisib] as a B-cell receptor drug,” Dr Zelenetz said, “but it is more than that. It is involved in signaling of very key pathways in cell survival and migration.”

The investigators hoped that by combining idelalisib with BR, they would be able to improve PFS and maintain tolerable toxicity. So they conducted Study 115 to find out.

Study 115 design and population

Study 115 was a double-blind, placebo-controlled phase 3 study.

The idelalisib arm consisted of 207 patients randomized to receive bendamustine at 70 mg/m² on days 1 and 2 every 4 weeks for 6 cycles, rituximab at 375 mg/m² during cycle 1 and 500 mg/m² cycles 2 through 6, and idelalisib at 150 mg twice daily until progression.

The BR arm consisted of 209 patients randomized to the same BR regimen plus placebo twice daily until progression.

Investigators stratified patients according to 17p deletion and/or TP52 mutation, IGHV mutation status, and refractory versus relapsed disease.

The primary endpoint was PFS and the secondary endpoints were overall response rate (ORR), nodal response, overall survival (OS), and complete response (CR) rate.

Patients had to have disease progression within less than 36 months from their last therapy, measurable disease, and no history of CLL transformation. They could not have progressed in less than 6 months from their last bendamustine treatment and they could not have had any prior inhibitors of BTK, PI3Kδ, or SYK.

Patient disposition and demographics

One hundred fifteen patients (56%) in the idelalisib arm are still on study, and 52% are on treatment. In the BR arm, 63 patients (30%) are still on study, and 29% are on treatment.

Patient characteristics were well balanced between the arms. Most patients (76%) were male, 58% were younger than 65 years and 42% were 65 or older. About half were Rai stage III/IV and the median number of prior regimens was 2 (range, 1–13).

The most common prior regimens in both arms were fludarabine/cyclophosphamide/rituximab, fludarabine/cyclophosphamide, and chlorambucil. Fifteen percent of patients in the idelalisib arm and 8% in the BR arm had prior BR.

A third of patients in each arm had either 17p deletion or TP53 mutation, and two-thirds had neither. Most patients did not have IGHV mutation—84% in the idelalisib group and 83% in the BR group.

Thirty-one percent of the idelalisib-treated patients and 29% of the placebo patients had refractory disease, and 69% and 71%, respectively, had relapsed disease.

Efficacy

Median PFS, as assessed by independent review committee, “was highly statistically significant,” Dr Zelenetz said,  at 23.1 months for idelalisib and 11.1 for BR (P<0.0001).

In addition, all subgroups analyzed favored idelalisib—refractory or relapsed disease, mutation status, cytogenetics, gender, age, and race.

Patients with neither deletion 17p nor TP53 had a hazard ratio of 0.22 favoring the idelalisib group, and patients with either one or the other of those mutations had a hazard ratio of 0.50 favoring idelalisib.

ORR was 68% and 45% for idelalisib and placebo, respectively, with 5% in the idelalisib arm and none in the placebo arm achieving a CR.

Dr Zelenetz pointed out that the CR rate was low largely due to missing confirmatory biopsies.

Ninety-six percent of patients in the idelalisib arm experienced 50% or more reduction in lymph nodes, compared with 61% in the placebo arm.

Patients in the idelalisib arm also experienced a significant improvement in OS of P=0.008 when stratified and P=0.023 when unstratified. Median OS has not been reached in either arm.

There was no difference in survival benefit in patients with refractory disease.

Safety

All patients in the idelalisib arm and 97% in the BR arm experienced an adverse event (AE), with 93% and 76% grade 3 or higher in the idelalisib and BR arms, respectively.

Serious AEs occurred in 66% of idelalisib-treated patients and 44% of placebo patients.

Fifty-four patients (26%) in the idelalisib arm discontinued the study drug due to AEs, and 22 (11%) required a study drug dose reduction. This was compared with 28 patients (13%) discontinuing and 13 patients requiring dose reductions in the placebo arm.

The most frequent AE occurring in more than 10% of patients was neutropenia. Grade 3 or higher neutropenia occurred in 60% of idelalisib patients and 46% of placebo patients.

Most AEs were higher in the idelalisib arm compared with the BR arm, including grade 3 or higher events, such as febrile neutropenia (20%, 6%), anemia (15%, 12%), thrombocytopenia (13%, 12%), pneumonia (11%, 6%), ALT increase (11%, <1%), pyrexia (7%, 3%), diarrhea (7%, 2%), and rash (3%, 0), among others.

Serious AEs occurring in more than 2% of patients were also higher in the idelalisib arm than the BR arm, and included febrile neutropenia (18%, 5%), pneumonia (14%, 6%), pyrexia (12%, 6%), neutropenia (4%, 1%), sepsis (4%, 1%), anemia (2%, 2%), lower respiratory tract infection (2%, 2%), diarrhea (4%, <1%), and neutropenic sepsis (1%, 3%).

The remainder of the serious AEs—urinary tract infection, bronchitis, septic shock, and squamous cell carcinoma—occurred in 2% or fewer patients in either arm.

Dr Zelenetz pointed out that the safety profile is consistent with previously reported studies.

Gilead Sciences developed idelalisib and funded Study 115.

*Data in the abstract differ slightly from data presented at the meeting.

Attendees meet in Orlando

Photo courtesy of ASH

ORLANDO, FL—Idelalisib, the first-in-class PI3Kδ inhibitor, combined with bendamustine and rituximab (BR) for relapsed/refractory chronic

lymphocytic leukemia (CLL) offers “an important new option over the standard of care,” according to Andrew Zelenetz, MD, a member of the

international research team that conducted the phase 3 study of this combination.

Patients who received idelalisib plus BR experienced a much longer progression-free survival (PFS) than those who received BR alone, 23.1

months versus 11.1 months, respectively.

“And the benefit was seen across risk groups,” Dr Zelenetz said.

He pointed out that the trial was stopped early in October because of the “overwhelming benefit” of idelalisib compared to the conventional therapy arm.

Dr Zelenetz, of Memorial Sloan Kettering Cancer Center in New York, New York, presented the findings at the 2015 ASH Annual Meeting as LBA-5.

Idelalisib had already been approved by the US Food and Drug Administration for the treatment of relapsed/refractory CLL.

“Many people refer to this [idelalisib] as a B-cell receptor drug,” Dr Zelenetz said, “but it is more than that. It is involved in signaling of very key pathways in cell survival and migration.”

The investigators hoped that by combining idelalisib with BR, they would be able to improve PFS and maintain tolerable toxicity. So they conducted Study 115 to find out.

Study 115 design and population

Study 115 was a double-blind, placebo-controlled phase 3 study.

The idelalisib arm consisted of 207 patients randomized to receive bendamustine at 70 mg/m² on days 1 and 2 every 4 weeks for 6 cycles, rituximab at 375 mg/m² during cycle 1 and 500 mg/m² cycles 2 through 6, and idelalisib at 150 mg twice daily until progression.

The BR arm consisted of 209 patients randomized to the same BR regimen plus placebo twice daily until progression.

Investigators stratified patients according to 17p deletion and/or TP52 mutation, IGHV mutation status, and refractory versus relapsed disease.

The primary endpoint was PFS and the secondary endpoints were overall response rate (ORR), nodal response, overall survival (OS), and complete response (CR) rate.

Patients had to have disease progression within less than 36 months from their last therapy, measurable disease, and no history of CLL transformation. They could not have progressed in less than 6 months from their last bendamustine treatment and they could not have had any prior inhibitors of BTK, PI3Kδ, or SYK.

Patient disposition and demographics

One hundred fifteen patients (56%) in the idelalisib arm are still on study, and 52% are on treatment. In the BR arm, 63 patients (30%) are still on study, and 29% are on treatment.

Patient characteristics were well balanced between the arms. Most patients (76%) were male, 58% were younger than 65 years and 42% were 65 or older. About half were Rai stage III/IV and the median number of prior regimens was 2 (range, 1–13).

The most common prior regimens in both arms were fludarabine/cyclophosphamide/rituximab, fludarabine/cyclophosphamide, and chlorambucil. Fifteen percent of patients in the idelalisib arm and 8% in the BR arm had prior BR.

A third of patients in each arm had either 17p deletion or TP53 mutation, and two-thirds had neither. Most patients did not have IGHV mutation—84% in the idelalisib group and 83% in the BR group.

Thirty-one percent of the idelalisib-treated patients and 29% of the placebo patients had refractory disease, and 69% and 71%, respectively, had relapsed disease.

Efficacy

Median PFS, as assessed by independent review committee, “was highly statistically significant,” Dr Zelenetz said,  at 23.1 months for idelalisib and 11.1 for BR (P<0.0001).

In addition, all subgroups analyzed favored idelalisib—refractory or relapsed disease, mutation status, cytogenetics, gender, age, and race.

Patients with neither deletion 17p nor TP53 had a hazard ratio of 0.22 favoring the idelalisib group, and patients with either one or the other of those mutations had a hazard ratio of 0.50 favoring idelalisib.

ORR was 68% and 45% for idelalisib and placebo, respectively, with 5% in the idelalisib arm and none in the placebo arm achieving a CR.

Dr Zelenetz pointed out that the CR rate was low largely due to missing confirmatory biopsies.

Ninety-six percent of patients in the idelalisib arm experienced 50% or more reduction in lymph nodes, compared with 61% in the placebo arm.

Patients in the idelalisib arm also experienced a significant improvement in OS of P=0.008 when stratified and P=0.023 when unstratified. Median OS has not been reached in either arm.

There was no difference in survival benefit in patients with refractory disease.

Safety

All patients in the idelalisib arm and 97% in the BR arm experienced an adverse event (AE), with 93% and 76% grade 3 or higher in the idelalisib and BR arms, respectively.

Serious AEs occurred in 66% of idelalisib-treated patients and 44% of placebo patients.

Fifty-four patients (26%) in the idelalisib arm discontinued the study drug due to AEs, and 22 (11%) required a study drug dose reduction. This was compared with 28 patients (13%) discontinuing and 13 patients requiring dose reductions in the placebo arm.

The most frequent AE occurring in more than 10% of patients was neutropenia. Grade 3 or higher neutropenia occurred in 60% of idelalisib patients and 46% of placebo patients.

Most AEs were higher in the idelalisib arm compared with the BR arm, including grade 3 or higher events, such as febrile neutropenia (20%, 6%), anemia (15%, 12%), thrombocytopenia (13%, 12%), pneumonia (11%, 6%), ALT increase (11%, <1%), pyrexia (7%, 3%), diarrhea (7%, 2%), and rash (3%, 0), among others.

Serious AEs occurring in more than 2% of patients were also higher in the idelalisib arm than the BR arm, and included febrile neutropenia (18%, 5%), pneumonia (14%, 6%), pyrexia (12%, 6%), neutropenia (4%, 1%), sepsis (4%, 1%), anemia (2%, 2%), lower respiratory tract infection (2%, 2%), diarrhea (4%, <1%), and neutropenic sepsis (1%, 3%).

The remainder of the serious AEs—urinary tract infection, bronchitis, septic shock, and squamous cell carcinoma—occurred in 2% or fewer patients in either arm.

Dr Zelenetz pointed out that the safety profile is consistent with previously reported studies.

Gilead Sciences developed idelalisib and funded Study 115.

*Data in the abstract differ slightly from data presented at the meeting.

Attendees meet in Orlando

Photo courtesy of ASH

ORLANDO, FL—Idelalisib, the first-in-class PI3Kδ inhibitor, combined with bendamustine and rituximab (BR) for relapsed/refractory chronic

lymphocytic leukemia (CLL) offers “an important new option over the standard of care,” according to Andrew Zelenetz, MD, a member of the

international research team that conducted the phase 3 study of this combination.

Patients who received idelalisib plus BR experienced a much longer progression-free survival (PFS) than those who received BR alone, 23.1

months versus 11.1 months, respectively.

“And the benefit was seen across risk groups,” Dr Zelenetz said.

He pointed out that the trial was stopped early in October because of the “overwhelming benefit” of idelalisib compared to the conventional therapy arm.

Dr Zelenetz, of Memorial Sloan Kettering Cancer Center in New York, New York, presented the findings at the 2015 ASH Annual Meeting as LBA-5.

Idelalisib had already been approved by the US Food and Drug Administration for the treatment of relapsed/refractory CLL.

“Many people refer to this [idelalisib] as a B-cell receptor drug,” Dr Zelenetz said, “but it is more than that. It is involved in signaling of very key pathways in cell survival and migration.”

The investigators hoped that by combining idelalisib with BR, they would be able to improve PFS and maintain tolerable toxicity. So they conducted Study 115 to find out.

Study 115 design and population

Study 115 was a double-blind, placebo-controlled phase 3 study.

The idelalisib arm consisted of 207 patients randomized to receive bendamustine at 70 mg/m² on days 1 and 2 every 4 weeks for 6 cycles, rituximab at 375 mg/m² during cycle 1 and 500 mg/m² cycles 2 through 6, and idelalisib at 150 mg twice daily until progression.

The BR arm consisted of 209 patients randomized to the same BR regimen plus placebo twice daily until progression.

Investigators stratified patients according to 17p deletion and/or TP52 mutation, IGHV mutation status, and refractory versus relapsed disease.

The primary endpoint was PFS and the secondary endpoints were overall response rate (ORR), nodal response, overall survival (OS), and complete response (CR) rate.

Patients had to have disease progression within less than 36 months from their last therapy, measurable disease, and no history of CLL transformation. They could not have progressed in less than 6 months from their last bendamustine treatment and they could not have had any prior inhibitors of BTK, PI3Kδ, or SYK.

Patient disposition and demographics

One hundred fifteen patients (56%) in the idelalisib arm are still on study, and 52% are on treatment. In the BR arm, 63 patients (30%) are still on study, and 29% are on treatment.

Patient characteristics were well balanced between the arms. Most patients (76%) were male, 58% were younger than 65 years and 42% were 65 or older. About half were Rai stage III/IV and the median number of prior regimens was 2 (range, 1–13).

The most common prior regimens in both arms were fludarabine/cyclophosphamide/rituximab, fludarabine/cyclophosphamide, and chlorambucil. Fifteen percent of patients in the idelalisib arm and 8% in the BR arm had prior BR.

A third of patients in each arm had either 17p deletion or TP53 mutation, and two-thirds had neither. Most patients did not have IGHV mutation—84% in the idelalisib group and 83% in the BR group.

Thirty-one percent of the idelalisib-treated patients and 29% of the placebo patients had refractory disease, and 69% and 71%, respectively, had relapsed disease.

Efficacy

Median PFS, as assessed by independent review committee, “was highly statistically significant,” Dr Zelenetz said,  at 23.1 months for idelalisib and 11.1 for BR (P<0.0001).

In addition, all subgroups analyzed favored idelalisib—refractory or relapsed disease, mutation status, cytogenetics, gender, age, and race.

Patients with neither deletion 17p nor TP53 had a hazard ratio of 0.22 favoring the idelalisib group, and patients with either one or the other of those mutations had a hazard ratio of 0.50 favoring idelalisib.

ORR was 68% and 45% for idelalisib and placebo, respectively, with 5% in the idelalisib arm and none in the placebo arm achieving a CR.

Dr Zelenetz pointed out that the CR rate was low largely due to missing confirmatory biopsies.

Ninety-six percent of patients in the idelalisib arm experienced 50% or more reduction in lymph nodes, compared with 61% in the placebo arm.

Patients in the idelalisib arm also experienced a significant improvement in OS of P=0.008 when stratified and P=0.023 when unstratified. Median OS has not been reached in either arm.

There was no difference in survival benefit in patients with refractory disease.

Safety

All patients in the idelalisib arm and 97% in the BR arm experienced an adverse event (AE), with 93% and 76% grade 3 or higher in the idelalisib and BR arms, respectively.

Serious AEs occurred in 66% of idelalisib-treated patients and 44% of placebo patients.

Fifty-four patients (26%) in the idelalisib arm discontinued the study drug due to AEs, and 22 (11%) required a study drug dose reduction. This was compared with 28 patients (13%) discontinuing and 13 patients requiring dose reductions in the placebo arm.

The most frequent AE occurring in more than 10% of patients was neutropenia. Grade 3 or higher neutropenia occurred in 60% of idelalisib patients and 46% of placebo patients.

Most AEs were higher in the idelalisib arm compared with the BR arm, including grade 3 or higher events, such as febrile neutropenia (20%, 6%), anemia (15%, 12%), thrombocytopenia (13%, 12%), pneumonia (11%, 6%), ALT increase (11%, <1%), pyrexia (7%, 3%), diarrhea (7%, 2%), and rash (3%, 0), among others.

Serious AEs occurring in more than 2% of patients were also higher in the idelalisib arm than the BR arm, and included febrile neutropenia (18%, 5%), pneumonia (14%, 6%), pyrexia (12%, 6%), neutropenia (4%, 1%), sepsis (4%, 1%), anemia (2%, 2%), lower respiratory tract infection (2%, 2%), diarrhea (4%, <1%), and neutropenic sepsis (1%, 3%).

The remainder of the serious AEs—urinary tract infection, bronchitis, septic shock, and squamous cell carcinoma—occurred in 2% or fewer patients in either arm.

Dr Zelenetz pointed out that the safety profile is consistent with previously reported studies.

Gilead Sciences developed idelalisib and funded Study 115.

*Data in the abstract differ slightly from data presented at the meeting.

ORLANDO – Partnering the PD-1 antibody pembrolizumab with pomalidomide and dexamethasone induced responses in 60% of 27 patients with heavily pretreated relapsed and/or refractory multiple myeloma in a phase II trial.

This included 1 stringent complete response, 4 very good partial responses (VGPR), and 11 partial responses (PR). Eight patients had stable disease and 3 progressed.

Further, the overall response rate was 55% (2 VGPR, 9 PR) in patients double-refractory to immunomodulatory drugs (IMiDs) and proteasome inhibitors (PIs) and 50% (1 VGPR and 5 PR) in those with high-risk cytogenetics.

“The regimen shows promising anti-myeloma activity in heavily pretreated patients” and had a “predictable and manageable side-effect profile,” Dr. Asraf Badros of University of Maryland Marlene and Stewart Greenebaum Cancer Center, Baltimore, said at the annual meeting of the American Society of Hematology.

The investigators hypothesized that blocking signaling of the programmed cell death protein 1 (PD-1) and its ligand PD-L1 with pembrolizumab (Keytruda) would activate multiple myeloma-specific cytotoxic T cells that could be further enhanced by the immunomodulator pomalidomide (Pomalyst).

The primary goal of the ongoing study is to establish the safety of the combination therapy.

In all, 33 patients received 28-day cycles of pembrolizumab 200 mg intravenous every 2 weeks plus pomalidomide 4 mg daily for 21 days and dexamethasone 40 mg weekly (20 mg for patients older than 70 years). After 24 months, responders will continue pomalidomide and dexamethasone alone until progression.

At enrollment, patients had to have relapsed and/or refractory disease after at least two lines of prior therapy including an IMiD and a PI, an ECOG performance status of less than 2, and adequate organ function.

Key exclusion criteria are an active autoimmune disease requiring systemic treatment or a history of severe autoimmune disease such as interstitial lung disease or active, non-infectious pneumonitis.

Patients received a median of three prior lines of therapy, 67% had prior autologous transplant, 89% were refractory to lenalidomide, and 70% were double-refractory to both IMiDs and PIs. The median age was 65 years (range 42-81 years), 73% were male, and 42% had high-risk deletion 17p and/or a translocation of chromosomes 14 and 16 [t(14;16)].

The median number of cycles was six and median follow-up short at 7.4 months.

The most common adverse events reported in 10% of all grades were fatigue and hypoglycemia, mostly grades 1 and 2.

The most serious adverse events in the study were pneumonia and infection, including one death due to sepsis, Dr. Badros said. Two other patients died as a result of disease progression and one because of a cardiac event.

“We reported a lot, actually, of immune-related adverse events,” he said.

In 10% of patients, the investigators noted pneumonitis, one of which was grade 3, as well as hyperthyroidism and autoimmune hepatitis. Pembrolizumab was not stopped and the pneumonitis was treated with steroids until symptoms resolved. Patients resumed the assigned doses, though one patient withdrew consent.

The pneumonitis did not appear to be associated with prior therapy and it “responded extremely quickly and well to the steroids, indicating it might be a cytokine release issue,” Dr. Badros said.

Five patients required pomalidomide dose reductions due to neutropenia in two, and one case each of rash, palpitations, and fatigue. After the septic death, antibiotic prophylaxis was started in all patients, he said.

A total of 22 patients remain on study, with 7 patients discontinuing because of disease progression.

Given the short follow-up, it is “too early to talk about progression-free and overall-survival, but the signal we are getting is quite impressive,” Dr. Badros said.

The investigators also tried to look at PD-L1 expression in bone marrow samples collected at screening and on day 1 of cycle 3. No PD-L1 expression was found on plasma cells in the first patient, about 40% expression in the second, and 100% expression in the third, which is consistent with the heterogeneity of PD-L1 expression reported previously in the literature, Dr. Badros said. PD-L1 expression on bone marrow biopsies was very hard to standardize and they are exploring various methods to assess the impact of fixation and decalcification on level of expression, he added.

Dr. Badros disclosed off-label use of pembrolizumab and no relevant conflicts of interest.

pwendling@frontlinemedcom.com

ORLANDO – Partnering the PD-1 antibody pembrolizumab with pomalidomide and dexamethasone induced responses in 60% of 27 patients with heavily pretreated relapsed and/or refractory multiple myeloma in a phase II trial.

This included 1 stringent complete response, 4 very good partial responses (VGPR), and 11 partial responses (PR). Eight patients had stable disease and 3 progressed.

Further, the overall response rate was 55% (2 VGPR, 9 PR) in patients double-refractory to immunomodulatory drugs (IMiDs) and proteasome inhibitors (PIs) and 50% (1 VGPR and 5 PR) in those with high-risk cytogenetics.

“The regimen shows promising anti-myeloma activity in heavily pretreated patients” and had a “predictable and manageable side-effect profile,” Dr. Asraf Badros of University of Maryland Marlene and Stewart Greenebaum Cancer Center, Baltimore, said at the annual meeting of the American Society of Hematology.

The investigators hypothesized that blocking signaling of the programmed cell death protein 1 (PD-1) and its ligand PD-L1 with pembrolizumab (Keytruda) would activate multiple myeloma-specific cytotoxic T cells that could be further enhanced by the immunomodulator pomalidomide (Pomalyst).

The primary goal of the ongoing study is to establish the safety of the combination therapy.

In all, 33 patients received 28-day cycles of pembrolizumab 200 mg intravenous every 2 weeks plus pomalidomide 4 mg daily for 21 days and dexamethasone 40 mg weekly (20 mg for patients older than 70 years). After 24 months, responders will continue pomalidomide and dexamethasone alone until progression.

At enrollment, patients had to have relapsed and/or refractory disease after at least two lines of prior therapy including an IMiD and a PI, an ECOG performance status of less than 2, and adequate organ function.

Key exclusion criteria are an active autoimmune disease requiring systemic treatment or a history of severe autoimmune disease such as interstitial lung disease or active, non-infectious pneumonitis.

Patients received a median of three prior lines of therapy, 67% had prior autologous transplant, 89% were refractory to lenalidomide, and 70% were double-refractory to both IMiDs and PIs. The median age was 65 years (range 42-81 years), 73% were male, and 42% had high-risk deletion 17p and/or a translocation of chromosomes 14 and 16 [t(14;16)].

The median number of cycles was six and median follow-up short at 7.4 months.

The most common adverse events reported in 10% of all grades were fatigue and hypoglycemia, mostly grades 1 and 2.

The most serious adverse events in the study were pneumonia and infection, including one death due to sepsis, Dr. Badros said. Two other patients died as a result of disease progression and one because of a cardiac event.

“We reported a lot, actually, of immune-related adverse events,” he said.

In 10% of patients, the investigators noted pneumonitis, one of which was grade 3, as well as hyperthyroidism and autoimmune hepatitis. Pembrolizumab was not stopped and the pneumonitis was treated with steroids until symptoms resolved. Patients resumed the assigned doses, though one patient withdrew consent.

The pneumonitis did not appear to be associated with prior therapy and it “responded extremely quickly and well to the steroids, indicating it might be a cytokine release issue,” Dr. Badros said.

Five patients required pomalidomide dose reductions due to neutropenia in two, and one case each of rash, palpitations, and fatigue. After the septic death, antibiotic prophylaxis was started in all patients, he said.

A total of 22 patients remain on study, with 7 patients discontinuing because of disease progression.

Given the short follow-up, it is “too early to talk about progression-free and overall-survival, but the signal we are getting is quite impressive,” Dr. Badros said.

The investigators also tried to look at PD-L1 expression in bone marrow samples collected at screening and on day 1 of cycle 3. No PD-L1 expression was found on plasma cells in the first patient, about 40% expression in the second, and 100% expression in the third, which is consistent with the heterogeneity of PD-L1 expression reported previously in the literature, Dr. Badros said. PD-L1 expression on bone marrow biopsies was very hard to standardize and they are exploring various methods to assess the impact of fixation and decalcification on level of expression, he added.

Dr. Badros disclosed off-label use of pembrolizumab and no relevant conflicts of interest.

pwendling@frontlinemedcom.com

ORLANDO – Partnering the PD-1 antibody pembrolizumab with pomalidomide and dexamethasone induced responses in 60% of 27 patients with heavily pretreated relapsed and/or refractory multiple myeloma in a phase II trial.

This included 1 stringent complete response, 4 very good partial responses (VGPR), and 11 partial responses (PR). Eight patients had stable disease and 3 progressed.

Further, the overall response rate was 55% (2 VGPR, 9 PR) in patients double-refractory to immunomodulatory drugs (IMiDs) and proteasome inhibitors (PIs) and 50% (1 VGPR and 5 PR) in those with high-risk cytogenetics.

“The regimen shows promising anti-myeloma activity in heavily pretreated patients” and had a “predictable and manageable side-effect profile,” Dr. Asraf Badros of University of Maryland Marlene and Stewart Greenebaum Cancer Center, Baltimore, said at the annual meeting of the American Society of Hematology.

The investigators hypothesized that blocking signaling of the programmed cell death protein 1 (PD-1) and its ligand PD-L1 with pembrolizumab (Keytruda) would activate multiple myeloma-specific cytotoxic T cells that could be further enhanced by the immunomodulator pomalidomide (Pomalyst).

The primary goal of the ongoing study is to establish the safety of the combination therapy.

In all, 33 patients received 28-day cycles of pembrolizumab 200 mg intravenous every 2 weeks plus pomalidomide 4 mg daily for 21 days and dexamethasone 40 mg weekly (20 mg for patients older than 70 years). After 24 months, responders will continue pomalidomide and dexamethasone alone until progression.

At enrollment, patients had to have relapsed and/or refractory disease after at least two lines of prior therapy including an IMiD and a PI, an ECOG performance status of less than 2, and adequate organ function.

Key exclusion criteria are an active autoimmune disease requiring systemic treatment or a history of severe autoimmune disease such as interstitial lung disease or active, non-infectious pneumonitis.

Patients received a median of three prior lines of therapy, 67% had prior autologous transplant, 89% were refractory to lenalidomide, and 70% were double-refractory to both IMiDs and PIs. The median age was 65 years (range 42-81 years), 73% were male, and 42% had high-risk deletion 17p and/or a translocation of chromosomes 14 and 16 [t(14;16)].

The median number of cycles was six and median follow-up short at 7.4 months.

The most common adverse events reported in 10% of all grades were fatigue and hypoglycemia, mostly grades 1 and 2.

The most serious adverse events in the study were pneumonia and infection, including one death due to sepsis, Dr. Badros said. Two other patients died as a result of disease progression and one because of a cardiac event.

“We reported a lot, actually, of immune-related adverse events,” he said.

In 10% of patients, the investigators noted pneumonitis, one of which was grade 3, as well as hyperthyroidism and autoimmune hepatitis. Pembrolizumab was not stopped and the pneumonitis was treated with steroids until symptoms resolved. Patients resumed the assigned doses, though one patient withdrew consent.

The pneumonitis did not appear to be associated with prior therapy and it “responded extremely quickly and well to the steroids, indicating it might be a cytokine release issue,” Dr. Badros said.

Five patients required pomalidomide dose reductions due to neutropenia in two, and one case each of rash, palpitations, and fatigue. After the septic death, antibiotic prophylaxis was started in all patients, he said.

A total of 22 patients remain on study, with 7 patients discontinuing because of disease progression.

Given the short follow-up, it is “too early to talk about progression-free and overall-survival, but the signal we are getting is quite impressive,” Dr. Badros said.

The investigators also tried to look at PD-L1 expression in bone marrow samples collected at screening and on day 1 of cycle 3. No PD-L1 expression was found on plasma cells in the first patient, about 40% expression in the second, and 100% expression in the third, which is consistent with the heterogeneity of PD-L1 expression reported previously in the literature, Dr. Badros said. PD-L1 expression on bone marrow biopsies was very hard to standardize and they are exploring various methods to assess the impact of fixation and decalcification on level of expression, he added.

Dr. Badros disclosed off-label use of pembrolizumab and no relevant conflicts of interest.

pwendling@frontlinemedcom.com

 

 

2015 ASH Annual Meeting

Photo courtesy of ASH

 

ORLANDO, FL—A 3-drug regimen is likely not worth pursuing as a first-line treatment option for follicular lymphoma (FL), according to a presentation at the 2015 ASH Annual Meeting.

In a phase 1 study, combination ibrutinib, rituximab, and lenalidomide did not provide any response benefit over that previously observed with rituximab and lenalidomide.

But the triplet increased toxicity—particularly the incidence of rash—and necessitated dose modifications.

Chaitra S. Ujjani, MD, of Georgetown University Hospital in Washington, DC, presented these results at the meeting as abstract 471.*

“The combination of rituximab and lenalidomide has demonstrated remarkable activity in follicular lymphoma,” Dr Ujjani began.

She noted that, in the CALGB 50401 trial of relapsed FL (Leonard et al. JCO 2015), the combination elicited an overall response rate (ORR) of 76% and a complete response (CR) rate of 39%, and the 2-year time to progression was 52%.

In the CALGB 50803 trial of previously untreated FL (Martin et al. ASCO 2014, 8521), the regimen produced an ORR of 96%, a CR rate of 71%, and a 2-year progression-free survival (PFS) of 89%. In another trial of previously untreated FL (Fowler et al. Lanc Onc 2014), the ORR was 90%, the CR rate was 80%, and the 3-year PFS was 79%.

Ibrutinib has also demonstrated activity in FL, Dr Ujjani pointed out. In a phase 1 study of relapsed FL (Fowler et al. ASH 2012), the drug produced an ORR of 55%, 3 of 11 patients achieved a CR, and the median PFS was 13.4 months.

In a phase 2 study of ibrutinib in relapsed FL (Bartlett et al. ASH 2014, 800), the ORR was 30%, 1 of 40 patients achieved a CR, and the median PFS was 9.9 months.

With this in mind, Dr Ujjani and her colleagues conducted the A051103 trial to determine the activity and tolerability of rituximab, lenalidomide, and ibrutinib in previously untreated patients with FL.

Study design

The study enrolled patients with grade 1-3a FL; stage III, IV, or bulky stage II disease; an ECOG performance status less than 2; and adequate organ function.

They received 4 doses of rituximab at 375 mg/m² on days 1, 8, 15, and 22 of cycle 1 (28 days). They received 4 additional doses (375 mg/m²) on day 1 of cycles 4, 6, 8, and 10.

The patients received lenalidomide according to their assigned dosing cohort on days 1 to 21 for 18 cycles. They received daily ibrutinib according to their assigned dosing cohort until progression or unacceptable toxicity.

The study had a 3+3 dose-escalation design. Dose level (DL) 0 was lenalidomide at 15 mg and ibrutinib at 420 mg, DL1 was lenalidomide at 15 mg and ibrutinib at 560 mg, and DL2 was lenalidomide at 20 mg and ibrutinib at 560 mg.

Patients also received allopurinol at 300 mg daily for tumor lysis prophylaxis and aspirin as thromboprophylaxis while on lenalidomide.

The researchers assessed dose-limiting toxicities (DLTs) weekly during cycle 1. Given the known incidence of rash with lenalidomide, grade 3 rash that resolved to less than grade 2 within 10 days was not included as a DLT.

Once the maximum-tolerated dose was determined, there was a 10-patient expansion cohort.

Patients and treatment

Twenty-two patients were enrolled between June 2013 and May 2015. Their median age was 53.5 years (range, 36-81), and 68% were male.

Seventy-three percent of patients had grade 1/2 disease, and 77% had stage IV disease. By FLIPI, 18% of patients were low-risk, 55% were intermediate-risk, and 27% were high-risk.

Three patients were treated at DL0, 3 at DL1, and 16 at DL2. There were no DLTs reported at any dose level.

However, 11 patients required dose reductions due to toxicity (7 due to rash), and 12 patients ultimately discontinued treatment.

Reasons for discontinuation included progression (n=2), new diagnosis of carcinoma requiring systemic therapy (n=2), patient decision (n=3), and adverse events (n=6), including grade 3 rash (n=2), grade 3 atrial flutter (n=1), grade 3 diarrhea (n=1), hypertension (n=1), and depression (n=1). (One patient discontinued due to rash and progression.)

Adverse events

Dr Ujjani said the hematologic toxicity profile was similar to that observed with rituximab and lenalidomide in the front-line setting. Grade 3/4 hematologic toxicities included neutropenia (18.2%), thrombocytopenia (4.5%), anemia (4.5%), and lymphopenia (4.5%).

The most common non-hematologic toxicities (occurring in more than 20% of patients) were rash, diarrhea, fatigue, infusion-related reactions, nausea, infection, and neoplasms. There were no grade 4 non-hematologic toxicities.

Compared to rituximab and lenalidomide, the triplet was associated with an increase in rash, diarrhea, arthralgia, and neoplasm. There were 2 cutaneous neoplasms and 3 carcinomas.

Rash

“While no protocol-defined DLTs were observed, the regimen was associated with clinically significant rash,” Dr Ujjani noted. “Rash may have been related to individual study drugs or drug-drug interactions.”

Rash occurred in 82% of patients overall, 100% of patients treated at DL0, 67% at DL1, and 81% at DL2. The incidence of grade 1/2 rash was 46% overall, 67% at DL0, 33% at DL1, and 44% at DL2. The incidence of grade 3 rash was 36% overall, 33% at DL0 and DL1, and 38% at DL2.

The incidence of rash was similar whether or not patients received allopurinol. Ten of 11 patients on allopurinol had a rash, and 8 of 11 patients not on allopurinol had a rash.

“The time of [rash] onset was typically during cycle 1 but was seen as late as cycle 5,” Dr Ujjani said. “Grade 1 and 2 rashes resolved spontaneously without dose modification. The incidence of these milder rashes were comparable to our prior reports of rituximab and lenalidomide.”

“Grade 3 rash, however, occurred in 36% of patients, which is significantly higher than [with] rituximab and lenalidomide, [which is] typically 7% to 8%, or single-agent ibrutinib, which is about 3% to 4%.”

Patients with grade 3 rash were managed with supportive care, including acetaminophen, diphenhydramine, and oral corticosteroids.

All but 1 patient (7/8) had dose delays and reductions due to rash. One patient withdrew from the study because of rash, and 1 patient withdrew because of disease progression that occurred during a dose delay for rash.

Response and survival

The ORR was 95% for the entire cohort, 100% at DL0 and DL1 and 94% at DL2. The CR/unconfirmed CR rate was 63% overall, 67% at DL0, 33% at DL1, and 69% at DL2.

The partial response rate was 32% overall, 33% at DL0, 67% at DL1, and 25% at DL2. Five percent of patients had stable disease, all at DL2 (6% of this group).

The median time to first response was 2.3 months (range, 1.9 to 11.1). And the median time to best response was 5.5 months (range, 1.9 to 20.2).

At a median follow-up of 12.3 months, all patients are still alive. The 12-month PFS is 84%.

“Preliminary response data were similar to the prior CALGB/Alliance study of rituximab and lenalidomide,” Dr Ujjani noted. “However, given the increased toxicity and required dose modifications, the additional benefit of a third agent is not apparent, and further investigation of the triplet in this setting seems unwarranted.”

*Data in the abstract differ from data presented at the meeting.

 

 

2015 ASH Annual Meeting

Photo courtesy of ASH

 

ORLANDO, FL—A 3-drug regimen is likely not worth pursuing as a first-line treatment option for follicular lymphoma (FL), according to a presentation at the 2015 ASH Annual Meeting.

In a phase 1 study, combination ibrutinib, rituximab, and lenalidomide did not provide any response benefit over that previously observed with rituximab and lenalidomide.

But the triplet increased toxicity—particularly the incidence of rash—and necessitated dose modifications.

Chaitra S. Ujjani, MD, of Georgetown University Hospital in Washington, DC, presented these results at the meeting as abstract 471.*

“The combination of rituximab and lenalidomide has demonstrated remarkable activity in follicular lymphoma,” Dr Ujjani began.

She noted that, in the CALGB 50401 trial of relapsed FL (Leonard et al. JCO 2015), the combination elicited an overall response rate (ORR) of 76% and a complete response (CR) rate of 39%, and the 2-year time to progression was 52%.

In the CALGB 50803 trial of previously untreated FL (Martin et al. ASCO 2014, 8521), the regimen produced an ORR of 96%, a CR rate of 71%, and a 2-year progression-free survival (PFS) of 89%. In another trial of previously untreated FL (Fowler et al. Lanc Onc 2014), the ORR was 90%, the CR rate was 80%, and the 3-year PFS was 79%.

Ibrutinib has also demonstrated activity in FL, Dr Ujjani pointed out. In a phase 1 study of relapsed FL (Fowler et al. ASH 2012), the drug produced an ORR of 55%, 3 of 11 patients achieved a CR, and the median PFS was 13.4 months.

In a phase 2 study of ibrutinib in relapsed FL (Bartlett et al. ASH 2014, 800), the ORR was 30%, 1 of 40 patients achieved a CR, and the median PFS was 9.9 months.

With this in mind, Dr Ujjani and her colleagues conducted the A051103 trial to determine the activity and tolerability of rituximab, lenalidomide, and ibrutinib in previously untreated patients with FL.

Study design

The study enrolled patients with grade 1-3a FL; stage III, IV, or bulky stage II disease; an ECOG performance status less than 2; and adequate organ function.

They received 4 doses of rituximab at 375 mg/m² on days 1, 8, 15, and 22 of cycle 1 (28 days). They received 4 additional doses (375 mg/m²) on day 1 of cycles 4, 6, 8, and 10.

The patients received lenalidomide according to their assigned dosing cohort on days 1 to 21 for 18 cycles. They received daily ibrutinib according to their assigned dosing cohort until progression or unacceptable toxicity.

The study had a 3+3 dose-escalation design. Dose level (DL) 0 was lenalidomide at 15 mg and ibrutinib at 420 mg, DL1 was lenalidomide at 15 mg and ibrutinib at 560 mg, and DL2 was lenalidomide at 20 mg and ibrutinib at 560 mg.

Patients also received allopurinol at 300 mg daily for tumor lysis prophylaxis and aspirin as thromboprophylaxis while on lenalidomide.

The researchers assessed dose-limiting toxicities (DLTs) weekly during cycle 1. Given the known incidence of rash with lenalidomide, grade 3 rash that resolved to less than grade 2 within 10 days was not included as a DLT.

Once the maximum-tolerated dose was determined, there was a 10-patient expansion cohort.

Patients and treatment

Twenty-two patients were enrolled between June 2013 and May 2015. Their median age was 53.5 years (range, 36-81), and 68% were male.

Seventy-three percent of patients had grade 1/2 disease, and 77% had stage IV disease. By FLIPI, 18% of patients were low-risk, 55% were intermediate-risk, and 27% were high-risk.

Three patients were treated at DL0, 3 at DL1, and 16 at DL2. There were no DLTs reported at any dose level.

However, 11 patients required dose reductions due to toxicity (7 due to rash), and 12 patients ultimately discontinued treatment.

Reasons for discontinuation included progression (n=2), new diagnosis of carcinoma requiring systemic therapy (n=2), patient decision (n=3), and adverse events (n=6), including grade 3 rash (n=2), grade 3 atrial flutter (n=1), grade 3 diarrhea (n=1), hypertension (n=1), and depression (n=1). (One patient discontinued due to rash and progression.)

Adverse events

Dr Ujjani said the hematologic toxicity profile was similar to that observed with rituximab and lenalidomide in the front-line setting. Grade 3/4 hematologic toxicities included neutropenia (18.2%), thrombocytopenia (4.5%), anemia (4.5%), and lymphopenia (4.5%).

The most common non-hematologic toxicities (occurring in more than 20% of patients) were rash, diarrhea, fatigue, infusion-related reactions, nausea, infection, and neoplasms. There were no grade 4 non-hematologic toxicities.

Compared to rituximab and lenalidomide, the triplet was associated with an increase in rash, diarrhea, arthralgia, and neoplasm. There were 2 cutaneous neoplasms and 3 carcinomas.

Rash

“While no protocol-defined DLTs were observed, the regimen was associated with clinically significant rash,” Dr Ujjani noted. “Rash may have been related to individual study drugs or drug-drug interactions.”

Rash occurred in 82% of patients overall, 100% of patients treated at DL0, 67% at DL1, and 81% at DL2. The incidence of grade 1/2 rash was 46% overall, 67% at DL0, 33% at DL1, and 44% at DL2. The incidence of grade 3 rash was 36% overall, 33% at DL0 and DL1, and 38% at DL2.

The incidence of rash was similar whether or not patients received allopurinol. Ten of 11 patients on allopurinol had a rash, and 8 of 11 patients not on allopurinol had a rash.

“The time of [rash] onset was typically during cycle 1 but was seen as late as cycle 5,” Dr Ujjani said. “Grade 1 and 2 rashes resolved spontaneously without dose modification. The incidence of these milder rashes were comparable to our prior reports of rituximab and lenalidomide.”

“Grade 3 rash, however, occurred in 36% of patients, which is significantly higher than [with] rituximab and lenalidomide, [which is] typically 7% to 8%, or single-agent ibrutinib, which is about 3% to 4%.”

Patients with grade 3 rash were managed with supportive care, including acetaminophen, diphenhydramine, and oral corticosteroids.

All but 1 patient (7/8) had dose delays and reductions due to rash. One patient withdrew from the study because of rash, and 1 patient withdrew because of disease progression that occurred during a dose delay for rash.

Response and survival

The ORR was 95% for the entire cohort, 100% at DL0 and DL1 and 94% at DL2. The CR/unconfirmed CR rate was 63% overall, 67% at DL0, 33% at DL1, and 69% at DL2.

The partial response rate was 32% overall, 33% at DL0, 67% at DL1, and 25% at DL2. Five percent of patients had stable disease, all at DL2 (6% of this group).

The median time to first response was 2.3 months (range, 1.9 to 11.1). And the median time to best response was 5.5 months (range, 1.9 to 20.2).

At a median follow-up of 12.3 months, all patients are still alive. The 12-month PFS is 84%.

“Preliminary response data were similar to the prior CALGB/Alliance study of rituximab and lenalidomide,” Dr Ujjani noted. “However, given the increased toxicity and required dose modifications, the additional benefit of a third agent is not apparent, and further investigation of the triplet in this setting seems unwarranted.”

*Data in the abstract differ from data presented at the meeting.

 

 

2015 ASH Annual Meeting

Photo courtesy of ASH

 

ORLANDO, FL—A 3-drug regimen is likely not worth pursuing as a first-line treatment option for follicular lymphoma (FL), according to a presentation at the 2015 ASH Annual Meeting.

In a phase 1 study, combination ibrutinib, rituximab, and lenalidomide did not provide any response benefit over that previously observed with rituximab and lenalidomide.

But the triplet increased toxicity—particularly the incidence of rash—and necessitated dose modifications.

Chaitra S. Ujjani, MD, of Georgetown University Hospital in Washington, DC, presented these results at the meeting as abstract 471.*

“The combination of rituximab and lenalidomide has demonstrated remarkable activity in follicular lymphoma,” Dr Ujjani began.

She noted that, in the CALGB 50401 trial of relapsed FL (Leonard et al. JCO 2015), the combination elicited an overall response rate (ORR) of 76% and a complete response (CR) rate of 39%, and the 2-year time to progression was 52%.

In the CALGB 50803 trial of previously untreated FL (Martin et al. ASCO 2014, 8521), the regimen produced an ORR of 96%, a CR rate of 71%, and a 2-year progression-free survival (PFS) of 89%. In another trial of previously untreated FL (Fowler et al. Lanc Onc 2014), the ORR was 90%, the CR rate was 80%, and the 3-year PFS was 79%.

Ibrutinib has also demonstrated activity in FL, Dr Ujjani pointed out. In a phase 1 study of relapsed FL (Fowler et al. ASH 2012), the drug produced an ORR of 55%, 3 of 11 patients achieved a CR, and the median PFS was 13.4 months.

In a phase 2 study of ibrutinib in relapsed FL (Bartlett et al. ASH 2014, 800), the ORR was 30%, 1 of 40 patients achieved a CR, and the median PFS was 9.9 months.

With this in mind, Dr Ujjani and her colleagues conducted the A051103 trial to determine the activity and tolerability of rituximab, lenalidomide, and ibrutinib in previously untreated patients with FL.

Study design

The study enrolled patients with grade 1-3a FL; stage III, IV, or bulky stage II disease; an ECOG performance status less than 2; and adequate organ function.

They received 4 doses of rituximab at 375 mg/m² on days 1, 8, 15, and 22 of cycle 1 (28 days). They received 4 additional doses (375 mg/m²) on day 1 of cycles 4, 6, 8, and 10.

The patients received lenalidomide according to their assigned dosing cohort on days 1 to 21 for 18 cycles. They received daily ibrutinib according to their assigned dosing cohort until progression or unacceptable toxicity.

The study had a 3+3 dose-escalation design. Dose level (DL) 0 was lenalidomide at 15 mg and ibrutinib at 420 mg, DL1 was lenalidomide at 15 mg and ibrutinib at 560 mg, and DL2 was lenalidomide at 20 mg and ibrutinib at 560 mg.

Patients also received allopurinol at 300 mg daily for tumor lysis prophylaxis and aspirin as thromboprophylaxis while on lenalidomide.

The researchers assessed dose-limiting toxicities (DLTs) weekly during cycle 1. Given the known incidence of rash with lenalidomide, grade 3 rash that resolved to less than grade 2 within 10 days was not included as a DLT.

Once the maximum-tolerated dose was determined, there was a 10-patient expansion cohort.

Patients and treatment

Twenty-two patients were enrolled between June 2013 and May 2015. Their median age was 53.5 years (range, 36-81), and 68% were male.

Seventy-three percent of patients had grade 1/2 disease, and 77% had stage IV disease. By FLIPI, 18% of patients were low-risk, 55% were intermediate-risk, and 27% were high-risk.

Three patients were treated at DL0, 3 at DL1, and 16 at DL2. There were no DLTs reported at any dose level.

However, 11 patients required dose reductions due to toxicity (7 due to rash), and 12 patients ultimately discontinued treatment.

Reasons for discontinuation included progression (n=2), new diagnosis of carcinoma requiring systemic therapy (n=2), patient decision (n=3), and adverse events (n=6), including grade 3 rash (n=2), grade 3 atrial flutter (n=1), grade 3 diarrhea (n=1), hypertension (n=1), and depression (n=1). (One patient discontinued due to rash and progression.)

Adverse events

Dr Ujjani said the hematologic toxicity profile was similar to that observed with rituximab and lenalidomide in the front-line setting. Grade 3/4 hematologic toxicities included neutropenia (18.2%), thrombocytopenia (4.5%), anemia (4.5%), and lymphopenia (4.5%).

The most common non-hematologic toxicities (occurring in more than 20% of patients) were rash, diarrhea, fatigue, infusion-related reactions, nausea, infection, and neoplasms. There were no grade 4 non-hematologic toxicities.

Compared to rituximab and lenalidomide, the triplet was associated with an increase in rash, diarrhea, arthralgia, and neoplasm. There were 2 cutaneous neoplasms and 3 carcinomas.

Rash

“While no protocol-defined DLTs were observed, the regimen was associated with clinically significant rash,” Dr Ujjani noted. “Rash may have been related to individual study drugs or drug-drug interactions.”

Rash occurred in 82% of patients overall, 100% of patients treated at DL0, 67% at DL1, and 81% at DL2. The incidence of grade 1/2 rash was 46% overall, 67% at DL0, 33% at DL1, and 44% at DL2. The incidence of grade 3 rash was 36% overall, 33% at DL0 and DL1, and 38% at DL2.

The incidence of rash was similar whether or not patients received allopurinol. Ten of 11 patients on allopurinol had a rash, and 8 of 11 patients not on allopurinol had a rash.

“The time of [rash] onset was typically during cycle 1 but was seen as late as cycle 5,” Dr Ujjani said. “Grade 1 and 2 rashes resolved spontaneously without dose modification. The incidence of these milder rashes were comparable to our prior reports of rituximab and lenalidomide.”

“Grade 3 rash, however, occurred in 36% of patients, which is significantly higher than [with] rituximab and lenalidomide, [which is] typically 7% to 8%, or single-agent ibrutinib, which is about 3% to 4%.”

Patients with grade 3 rash were managed with supportive care, including acetaminophen, diphenhydramine, and oral corticosteroids.

All but 1 patient (7/8) had dose delays and reductions due to rash. One patient withdrew from the study because of rash, and 1 patient withdrew because of disease progression that occurred during a dose delay for rash.

Response and survival

The ORR was 95% for the entire cohort, 100% at DL0 and DL1 and 94% at DL2. The CR/unconfirmed CR rate was 63% overall, 67% at DL0, 33% at DL1, and 69% at DL2.

The partial response rate was 32% overall, 33% at DL0, 67% at DL1, and 25% at DL2. Five percent of patients had stable disease, all at DL2 (6% of this group).

The median time to first response was 2.3 months (range, 1.9 to 11.1). And the median time to best response was 5.5 months (range, 1.9 to 20.2).

At a median follow-up of 12.3 months, all patients are still alive. The 12-month PFS is 84%.

“Preliminary response data were similar to the prior CALGB/Alliance study of rituximab and lenalidomide,” Dr Ujjani noted. “However, given the increased toxicity and required dose modifications, the additional benefit of a third agent is not apparent, and further investigation of the triplet in this setting seems unwarranted.”

*Data in the abstract differ from data presented at the meeting.