B-Cell Lymphoma ICYMI

Key clinical point: First-line ibrutinib+venetoclax led to high response and survival rates in patients with chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) regardless of high-risk genomic features generally associated with poor outcomes.

Major finding: Overall response and 36-month overall survival rates were >95% regardless of high-risk features. Patients with and without high-risk features had similar complete response (61% [95% CI 53%-70%] and 53% [95% CI 41%-65%], respectively) and 36-month progression-free survival (88% [95% CI 81%-93%] and 92% [95% CI 82%-97%], respectively) rates.

Study details: This post hoc analysis of the CAPTIVATE trial analyzed the pooled data of 195 patients with previously untreated CLL/SLL and known status of high-risk features [del(17p), TP53 mutation, and unmutated immunoglobulin heavy chain] treated with fixed-duration ibrutinib+venetoclax, of which 129 had ≥1 high-risk feature.

Disclosures: This study was funded by Pharmacyclics LLC, an AbbVie Company. Some authors declared receiving grants, personal fees, or other support from Pharmacyclics, AbbVie, or others. Two authors declared being employees of Pharmacyclics or AbbVie or having stock or other ownership interests in AbbVie.

Source: Allan JN et al. Outcomes in patients with high-risk features after fixed-duration ibrutinib plus venetoclax: Phase II CAPTIVATE study in first-line chronic lymphocytic leukemia. Clin Cancer Res. 2023 (Jun 7). doi: 10.1158/1078-0432.CCR-22-2779

Key clinical point: First-line ibrutinib+venetoclax led to high response and survival rates in patients with chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) regardless of high-risk genomic features generally associated with poor outcomes.

Major finding: Overall response and 36-month overall survival rates were >95% regardless of high-risk features. Patients with and without high-risk features had similar complete response (61% [95% CI 53%-70%] and 53% [95% CI 41%-65%], respectively) and 36-month progression-free survival (88% [95% CI 81%-93%] and 92% [95% CI 82%-97%], respectively) rates.

Study details: This post hoc analysis of the CAPTIVATE trial analyzed the pooled data of 195 patients with previously untreated CLL/SLL and known status of high-risk features [del(17p), TP53 mutation, and unmutated immunoglobulin heavy chain] treated with fixed-duration ibrutinib+venetoclax, of which 129 had ≥1 high-risk feature.

Disclosures: This study was funded by Pharmacyclics LLC, an AbbVie Company. Some authors declared receiving grants, personal fees, or other support from Pharmacyclics, AbbVie, or others. Two authors declared being employees of Pharmacyclics or AbbVie or having stock or other ownership interests in AbbVie.

Source: Allan JN et al. Outcomes in patients with high-risk features after fixed-duration ibrutinib plus venetoclax: Phase II CAPTIVATE study in first-line chronic lymphocytic leukemia. Clin Cancer Res. 2023 (Jun 7). doi: 10.1158/1078-0432.CCR-22-2779

Key clinical point: First-line ibrutinib+venetoclax led to high response and survival rates in patients with chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL) regardless of high-risk genomic features generally associated with poor outcomes.

Major finding: Overall response and 36-month overall survival rates were >95% regardless of high-risk features. Patients with and without high-risk features had similar complete response (61% [95% CI 53%-70%] and 53% [95% CI 41%-65%], respectively) and 36-month progression-free survival (88% [95% CI 81%-93%] and 92% [95% CI 82%-97%], respectively) rates.

Study details: This post hoc analysis of the CAPTIVATE trial analyzed the pooled data of 195 patients with previously untreated CLL/SLL and known status of high-risk features [del(17p), TP53 mutation, and unmutated immunoglobulin heavy chain] treated with fixed-duration ibrutinib+venetoclax, of which 129 had ≥1 high-risk feature.

Disclosures: This study was funded by Pharmacyclics LLC, an AbbVie Company. Some authors declared receiving grants, personal fees, or other support from Pharmacyclics, AbbVie, or others. Two authors declared being employees of Pharmacyclics or AbbVie or having stock or other ownership interests in AbbVie.

Source: Allan JN et al. Outcomes in patients with high-risk features after fixed-duration ibrutinib plus venetoclax: Phase II CAPTIVATE study in first-line chronic lymphocytic leukemia. Clin Cancer Res. 2023 (Jun 7). doi: 10.1158/1078-0432.CCR-22-2779

Key clinical point: The preexistence of depression, anxiety, or both is associated with shorter survival in older patients with diffuse large B-cell lymphoma (DLBCL).

Major finding: At a median follow-up of 2.0 years, patients with depression, anxiety, or both vs without any mental disorder had significantly lower 5-year overall survival rates (27.0% vs 37.4%; hazard ratio [HR] 1.37; 95% CI 1.29-1.44), with those with preexisting depression vs without any mental disorder having the worst rate (23.4% vs 38.0%; HR 1.37; P < .0001).

Study details: This retrospective cohort study analyzed the data of 13,244 patients age ≥ 67 years with DLBCL from the Surveillance, Epidemiology, and End Results-Medicare (SEER) registry, of which 2094 had depression, anxiety, or both at the time of their DLBCL diagnosis.

Disclosures: This study was funded by the American Society of Hematology and others. Some authors declared participating on Data Safety Monitoring or Advisory Boards or receiving financial support, royalties or licenses, or payments or honoraria for lectures, presentations, speakers’ bureaus, manuscript writing, or educational events from various organizations.

Source: Kuczmarski TM et al. Mental health disorders and survival among older patients with diffuse large B-cell lymphoma in the USA: A population-based study. Lancet Haematol. 2023 (Jun 1). doi: 10.1016/S2352-3026(23)00094-7

Key clinical point: The preexistence of depression, anxiety, or both is associated with shorter survival in older patients with diffuse large B-cell lymphoma (DLBCL).

Major finding: At a median follow-up of 2.0 years, patients with depression, anxiety, or both vs without any mental disorder had significantly lower 5-year overall survival rates (27.0% vs 37.4%; hazard ratio [HR] 1.37; 95% CI 1.29-1.44), with those with preexisting depression vs without any mental disorder having the worst rate (23.4% vs 38.0%; HR 1.37; P < .0001).

Study details: This retrospective cohort study analyzed the data of 13,244 patients age ≥ 67 years with DLBCL from the Surveillance, Epidemiology, and End Results-Medicare (SEER) registry, of which 2094 had depression, anxiety, or both at the time of their DLBCL diagnosis.

Disclosures: This study was funded by the American Society of Hematology and others. Some authors declared participating on Data Safety Monitoring or Advisory Boards or receiving financial support, royalties or licenses, or payments or honoraria for lectures, presentations, speakers’ bureaus, manuscript writing, or educational events from various organizations.

Source: Kuczmarski TM et al. Mental health disorders and survival among older patients with diffuse large B-cell lymphoma in the USA: A population-based study. Lancet Haematol. 2023 (Jun 1). doi: 10.1016/S2352-3026(23)00094-7

Key clinical point: The preexistence of depression, anxiety, or both is associated with shorter survival in older patients with diffuse large B-cell lymphoma (DLBCL).

Major finding: At a median follow-up of 2.0 years, patients with depression, anxiety, or both vs without any mental disorder had significantly lower 5-year overall survival rates (27.0% vs 37.4%; hazard ratio [HR] 1.37; 95% CI 1.29-1.44), with those with preexisting depression vs without any mental disorder having the worst rate (23.4% vs 38.0%; HR 1.37; P < .0001).

Study details: This retrospective cohort study analyzed the data of 13,244 patients age ≥ 67 years with DLBCL from the Surveillance, Epidemiology, and End Results-Medicare (SEER) registry, of which 2094 had depression, anxiety, or both at the time of their DLBCL diagnosis.

Disclosures: This study was funded by the American Society of Hematology and others. Some authors declared participating on Data Safety Monitoring or Advisory Boards or receiving financial support, royalties or licenses, or payments or honoraria for lectures, presentations, speakers’ bureaus, manuscript writing, or educational events from various organizations.

Source: Kuczmarski TM et al. Mental health disorders and survival among older patients with diffuse large B-cell lymphoma in the USA: A population-based study. Lancet Haematol. 2023 (Jun 1). doi: 10.1016/S2352-3026(23)00094-7

Key clinical point: Compared with the current standard-of-care chemoimmunotherapy, second-line axicabtagene ciloleucel (axi-cel) significantly prolongs the overall survival of patients with early relapsed or refractory large B-cell lymphoma (LBCL).

Major finding: At a median follow-up of 47.2 months, patients receiving axi-cel vs standard care had a significantly longer median overall survival (not reached vs 31.1 months; hazard ratio 0.73; P = .03) and an absolute improvement in overall survival (8.6 percentage points at 4 years). No new treatment-related deaths were reported since the primary event-free survival analysis.

Study details: This primary overall survival analysis of the phase 3 ZUMA-7 trial included 359 adults with LBCL (refractory to or relapsed after first-line treatment) who were randomly assigned to receive axi-cel (n = 180) or standard care (n = 179).

Disclosures: This study was funded by Kite Pharma. Some authors, including the lead author, declared serving as advisory board members, consultants, or speakers for; receiving research support, speaker fees, travel expenses, or honoraria from; or owning stock or stock options in various sources, including Kite.

Source: Westin JR et al. Survival with axicabtagene ciloleucel in large B-cell lymphoma. N Engl J Med. 2023 (Jun 5). doi: 10.1056/NEJMoa2301665

Key clinical point: Compared with the current standard-of-care chemoimmunotherapy, second-line axicabtagene ciloleucel (axi-cel) significantly prolongs the overall survival of patients with early relapsed or refractory large B-cell lymphoma (LBCL).

Major finding: At a median follow-up of 47.2 months, patients receiving axi-cel vs standard care had a significantly longer median overall survival (not reached vs 31.1 months; hazard ratio 0.73; P = .03) and an absolute improvement in overall survival (8.6 percentage points at 4 years). No new treatment-related deaths were reported since the primary event-free survival analysis.

Study details: This primary overall survival analysis of the phase 3 ZUMA-7 trial included 359 adults with LBCL (refractory to or relapsed after first-line treatment) who were randomly assigned to receive axi-cel (n = 180) or standard care (n = 179).

Disclosures: This study was funded by Kite Pharma. Some authors, including the lead author, declared serving as advisory board members, consultants, or speakers for; receiving research support, speaker fees, travel expenses, or honoraria from; or owning stock or stock options in various sources, including Kite.

Source: Westin JR et al. Survival with axicabtagene ciloleucel in large B-cell lymphoma. N Engl J Med. 2023 (Jun 5). doi: 10.1056/NEJMoa2301665

Key clinical point: Compared with the current standard-of-care chemoimmunotherapy, second-line axicabtagene ciloleucel (axi-cel) significantly prolongs the overall survival of patients with early relapsed or refractory large B-cell lymphoma (LBCL).

Major finding: At a median follow-up of 47.2 months, patients receiving axi-cel vs standard care had a significantly longer median overall survival (not reached vs 31.1 months; hazard ratio 0.73; P = .03) and an absolute improvement in overall survival (8.6 percentage points at 4 years). No new treatment-related deaths were reported since the primary event-free survival analysis.

Study details: This primary overall survival analysis of the phase 3 ZUMA-7 trial included 359 adults with LBCL (refractory to or relapsed after first-line treatment) who were randomly assigned to receive axi-cel (n = 180) or standard care (n = 179).

Disclosures: This study was funded by Kite Pharma. Some authors, including the lead author, declared serving as advisory board members, consultants, or speakers for; receiving research support, speaker fees, travel expenses, or honoraria from; or owning stock or stock options in various sources, including Kite.

Source: Westin JR et al. Survival with axicabtagene ciloleucel in large B-cell lymphoma. N Engl J Med. 2023 (Jun 5). doi: 10.1056/NEJMoa2301665

Key clinical point: Pirtobrutinib demonstrated durable efficacy and a favorable safety profile in patients with covalent Bruton tyrosine kinase inhibitor (cBTKi) pretreated relapsed or refractory mantle cell lymphoma (MCL).

Major finding: The overall response rate was 57.8% (95% CI 46.9%-68.1%), with the complete response rate being 20.0%. At a median follow-up of 12 months, the median duration of response was 21.6 (95% CI 7.5-not reached) months. Grade ≥3 treatment-related adverse events were not frequent, with neutropenia (8.5%) being the most common.

Study details: This multicenter phase 1/2 BRUIN trial included 90 cBTKi pretreated patients with relapsed or refractory MCL in the primary efficacy cohort who received 25-300 mg and 200 mg pirtobrutinib once daily orally in the phases 1 and 2 of the trial, respectively.

Disclosures: This study was sponsored by Loxo Oncology Inc., a wholly owned subsidiary of Eli Lilly and Company. Some authors reported ties with Eli Lilly and others. Seven authors declared being employees of or stockholders in Eli Lilly.

Source: Wang ML et al. Pirtobrutinib in covalent BTK-inhibitor pre-treated mantle cell lymphoma. J Clin Oncol. 2023 (May 16). doi: 10.1200/JCO.23.00562

Key clinical point: Pirtobrutinib demonstrated durable efficacy and a favorable safety profile in patients with covalent Bruton tyrosine kinase inhibitor (cBTKi) pretreated relapsed or refractory mantle cell lymphoma (MCL).

Major finding: The overall response rate was 57.8% (95% CI 46.9%-68.1%), with the complete response rate being 20.0%. At a median follow-up of 12 months, the median duration of response was 21.6 (95% CI 7.5-not reached) months. Grade ≥3 treatment-related adverse events were not frequent, with neutropenia (8.5%) being the most common.

Study details: This multicenter phase 1/2 BRUIN trial included 90 cBTKi pretreated patients with relapsed or refractory MCL in the primary efficacy cohort who received 25-300 mg and 200 mg pirtobrutinib once daily orally in the phases 1 and 2 of the trial, respectively.

Disclosures: This study was sponsored by Loxo Oncology Inc., a wholly owned subsidiary of Eli Lilly and Company. Some authors reported ties with Eli Lilly and others. Seven authors declared being employees of or stockholders in Eli Lilly.

Source: Wang ML et al. Pirtobrutinib in covalent BTK-inhibitor pre-treated mantle cell lymphoma. J Clin Oncol. 2023 (May 16). doi: 10.1200/JCO.23.00562

Key clinical point: Pirtobrutinib demonstrated durable efficacy and a favorable safety profile in patients with covalent Bruton tyrosine kinase inhibitor (cBTKi) pretreated relapsed or refractory mantle cell lymphoma (MCL).

Major finding: The overall response rate was 57.8% (95% CI 46.9%-68.1%), with the complete response rate being 20.0%. At a median follow-up of 12 months, the median duration of response was 21.6 (95% CI 7.5-not reached) months. Grade ≥3 treatment-related adverse events were not frequent, with neutropenia (8.5%) being the most common.

Study details: This multicenter phase 1/2 BRUIN trial included 90 cBTKi pretreated patients with relapsed or refractory MCL in the primary efficacy cohort who received 25-300 mg and 200 mg pirtobrutinib once daily orally in the phases 1 and 2 of the trial, respectively.

Disclosures: This study was sponsored by Loxo Oncology Inc., a wholly owned subsidiary of Eli Lilly and Company. Some authors reported ties with Eli Lilly and others. Seven authors declared being employees of or stockholders in Eli Lilly.

Source: Wang ML et al. Pirtobrutinib in covalent BTK-inhibitor pre-treated mantle cell lymphoma. J Clin Oncol. 2023 (May 16). doi: 10.1200/JCO.23.00562

Patients with chronic lymphocytic leukemia (CLL) – even those who have multiple comorbidities – experience long-term progression-free survival (PFS) benefits with 1 year of venetoclax plus obinutuzumab versus a chemotherapy-based regimen, a 6-year follow-up analysis from CLL14 showed. The research was presented June 9 at the annual meeting of the European Hematology Association.

Initial results from the trial were shown at the EHA 2019 annual meeting and reported at the time by this news organization.

They revealed that, among more than 430 CLL patients with a median age of over 70 years and multiple comorbidities, the combination of venetoclax, a B-cell lymphoma 2 protein blocker, plus obinutuzumab, an anti-CD20 monoclonal antibody, was associated with a 65% improvement in PFS, compared with chlorambucil, a chemotherapy agent, plus obinutuzumab.

On the strength of these findings, the venetoclax-obinutuzumab combination received Food and Drug Administration approval for previously untreated CLL and small lymphocytic lymphoma in March 2019.

The latest analysis, presented by Othman Al-Sawaf, MD, University Hospital of Cologne (Germany), showed that despite having just 12 cycles of treatment, patients treated with venetoclax-obinutuzumab continued to experience a significant PFS benefit over those given the chemotherapy-based regimen, including in high-risk patients, after more than 6 years of follow-up.

Dr. Al-Sawaf noted that more than 50% of patients given the experimental combination remained without a PFS event at the latest follow-up, and that over 60% had not required a second treatment, equating to a 66% reduction in the likelihood of needing a second treatment versus chlorambucil-obinutuzumab.

Dr. Al-Sawaf said at a press conference that, “clinically, the standard of care for any CLL if it is asymptomatic” is watch and wait, which is “true in the frontline setting, but also in the relapse setting.”

Therefore, these patients “do not need to initiate the next line of treatment, and that’s why time to next treatment is so interesting.”

He added that there also were no new safety signals, with adverse event rates dropping markedly once treatment was over, although there was a suggestion of an increase in second malignancies with venetoclax-obinutuzumab.

“We’ve seen, in many studies now that use fixed-duration approaches, that there is virtually no posttreatment toxicity once patients are able to get off treatment,” Dr. Al-Sawaf said, adding: “This really highlights the benefit” of stopping treatment, “which is a clear advantage compared to having any kind of continuous treatment.”

Approached for comment, William G. Wierda, MD, PhD, professor, department of leukemia, division of cancer medicine, University of Texas MD Anderson Cancer Center, Houston, emphasized the value of the 6-year follow-up of the study, adding that these are “very impressive data.”

He told this news organization that, in terms of the ongoing PFS improvement, “we wouldn’t expect anything otherwise” with venetoclax-obinutuzumab when compared with the chemotherapy-based regimen, but that the trend for an improvement in overall survival is of particular interest.

This “is a notable feature of the update,” Dr. Wierda said, and “we will continue to watch the long-term overall survival curves with a longer follow-up,” especially as the separation of the curves between the two regimens is “more prominent” than in previous analyses of CLL14.

He also pointed to the low incidence of grade ≥ 3 adverse events in patients who are in remission, which “support the use of fixed-duration chemo-free” treatments, and the longer follow-up now allowing the contribution of high-risk features to outcomes to be teased out in multivariate analysis.

“The data that we’re looking for in the next update of this is some indication about improved outcomes between patients with a mutated and unmutated immunoglobulin heavy chain gene [IgHV], in regard to undetectable MRD [minimal residual disease] status,” Dr. Wierda said.

“We know that mutational status correlates with progression free survival,” he explained. “What we would like to see moving forward is how that is associated with undetectable MRD status at the end of treatment.”

Dr. Wierda said that the next hotly anticipated trial in the field is CLL17, which is comparing ibrutinib monotherapy to fixed-duration venetoclax-obinutuzumab to fixed-duration ibrutinib-venetoclax in patients with previously untreated CLL.

“That’s the next question: Is there any advantage of a BTK [Bruton’s tyrosine kinase] inhibitor with venetoclax over venetoclax plus the CD20 antibody?”

Dr. Al-Sawaf, in presenting the latest analysis, reminded the audience that CLL14 was a randomized phase 3 study focusing on patients with previously untreated CLL and coexisting conditions who were randomized to either venetoclax-obinutuzumab for six cycles, followed by six cycles of venetoclax, or chlorambucil-obinutuzumab for six cycles, followed by chlorambucil for six cycles.

The patients, who were enrolled between 2015 and 2016, were required to have a Cumulative Illness Rating Scale (CIRS) score > 6 and/or creatinine clearance < 70 mL/min, which Dr. Al-Sawaf explained serves as “indicator of the unfitness of the patients.”

A total of 432 patients took part in the study. The median age across the two treatment groups was 71-72 years, and the median total CIRS score was 8-9. The majority of patients (79%-80%) had Binet stage B or C CLL. An intermediate tumor lysis syndrome risk was identified in 64%-68%.

“We also had a fair share of patients with high-risk disease,” Dr. Al-Sawaf noted, with approximately 60% having an unmutated IGHV status, and 12% having a TP53 mutation, both of which are associated with a poorer prognosis.

He added that the “aim of these long-term observations that we try to do every year is not so much to do the comparisons to chlorambucil-obinutuzumab, which we appreciate is not necessarily a standard of care anymore,” but rather to understand the safety and effectiveness of venetoclax-obinutuzumab “in the long run, given that all patients are off treatment.”

Beginning with the safety data, Dr. Al-Sawaf showed that rates of grade ≥ 3 adverse events plummeted after the treatment period, with rates of neutropenia falling from 51.9% with venetoclax-obinutuzumab and 47.2% with chlorambucil-obinutuzumab during treatment to 3.8% and 1.9%, respectively, post treatment.

Similarly, rates of thrombocytopenia decreased from 14.2% on treatment to 0.5% off treatment in patients given venetoclax-obinutuzumab, and from 15.0% to 0.0% in the chlorambucil-obinutuzumab group.

One note of caution was sounded over the proportion of patients with at least one second primary malignancy following treatment, which was numerically higher with venetoclax-obinutuzumab, at 14.2% versus 8.4% with the chemotherapy-based regimen.

“But this is a rather a heterogeneous pattern of solid organ tumors and melanoma,” Dr. Al-Sawaf said, referring to the additional malignancies in the venetoclax-obinutuzumab arm. These included lung cancer, prostate cancer and breast cancer.

He said, however, there was no “specific pattern that we can really pinpoint ... and, importantly, the difference is not statistically significant.”

Turning to the efficacy outcomes, Dr. Al-Sawaf showed that, after median follow-up of 76.4 months, the separation in PFS between the two treatment arms continued, with the median PFS 76.2 months with venetoclax-obinutuzumab versus 36.4 months with chlorambucil-obinutuzumab, at a hazard ratio 0.40 (P < .0001).

The 6-year PFS rate in patients treated with venetoclax-obinutuzumab was 53.1% versus 21.7% with the chemotherapy-based regimen. Looking at the high-risk groups, Dr. Al-Sawaf reported that there was a similar pattern of benefit with venetoclax-obinutuzumab.

Among patients with a TP53 mutation, the median PFS was 51.9 months with the combination versus 20.8 months in those given chlorambucil-obinutuzumab, while the corresponding durations in patients with unmutated IGHV were 64.8 months and 26.9 months, respectively.

Multivariate analysis demonstrated that IGHV status was an independent predictor of PFS in patients treated with venetoclax-obinutuzumab, as was the presence of a TP53 mutation, and lymph node size ≥ 5 cm.

There was no significant difference in overall survival between the two treatment groups, although there was a numerical difference in 6-year overall survival rates, at 78.7% with the experimental combination versus 69.2% with chlorambucil-obinutuzumab.

Patients with a minimal residual disease (MRD) count ≥ 10-4 had a shorter overall survival than did those with MRD < 10-4.

“We are currently working up to understand which group of patients experiences these tremendous long term remissions,” Dr. Al-Sawaf said, “and we will keep you posted on this.”

He also showed that the time to next treatment (TTNT), defined as time to death or next anti-leukemic treatment, was significantly longer with venetoclax-obinutuzumab, with the median not reached before the current data lock versus 52.9 months with the chemotherapy-based regimen.

This equated to a hazard ratio in favor of the experimental combination of 0.44 (P < .0001), and a 6-year TTNT rate of 65.2% versus 37.1% for chlorambucil-obinutuzumab.

That second treatment was a Bruton’s tyrosine kinase inhibitor in 59.0% of cases in the venetoclax-obinutuzumab arm and 53.4% in the chlorambucil-obinutuzumab group.

Dr. Al-Sawaf noted, however, that 23.1% and 30.1%, respectively, of patients were given a chemotherapy or chemo-immunotherapy regimen, “which we nowadays would not necessarily consider a standard of care.”

“This ultimately reflects, as in many global clinical studies, the disparities that we still have across the world in terms of access to state-of-the-art therapies.”

The study was sponsored by Hoffmann–La Roche, and conducted in collaboration with AbbVie, and the German CLL Study Group. Dr. Al-Sawaf disclosed relationships with AbbVie, Adaptive, Ascentage, AstraZeneca, BeiGene, Gilead, Janssen, Lilly, and Roche.

Patients with chronic lymphocytic leukemia (CLL) – even those who have multiple comorbidities – experience long-term progression-free survival (PFS) benefits with 1 year of venetoclax plus obinutuzumab versus a chemotherapy-based regimen, a 6-year follow-up analysis from CLL14 showed. The research was presented June 9 at the annual meeting of the European Hematology Association.

Initial results from the trial were shown at the EHA 2019 annual meeting and reported at the time by this news organization.

They revealed that, among more than 430 CLL patients with a median age of over 70 years and multiple comorbidities, the combination of venetoclax, a B-cell lymphoma 2 protein blocker, plus obinutuzumab, an anti-CD20 monoclonal antibody, was associated with a 65% improvement in PFS, compared with chlorambucil, a chemotherapy agent, plus obinutuzumab.

On the strength of these findings, the venetoclax-obinutuzumab combination received Food and Drug Administration approval for previously untreated CLL and small lymphocytic lymphoma in March 2019.

The latest analysis, presented by Othman Al-Sawaf, MD, University Hospital of Cologne (Germany), showed that despite having just 12 cycles of treatment, patients treated with venetoclax-obinutuzumab continued to experience a significant PFS benefit over those given the chemotherapy-based regimen, including in high-risk patients, after more than 6 years of follow-up.

Dr. Al-Sawaf noted that more than 50% of patients given the experimental combination remained without a PFS event at the latest follow-up, and that over 60% had not required a second treatment, equating to a 66% reduction in the likelihood of needing a second treatment versus chlorambucil-obinutuzumab.

Dr. Al-Sawaf said at a press conference that, “clinically, the standard of care for any CLL if it is asymptomatic” is watch and wait, which is “true in the frontline setting, but also in the relapse setting.”

Therefore, these patients “do not need to initiate the next line of treatment, and that’s why time to next treatment is so interesting.”

He added that there also were no new safety signals, with adverse event rates dropping markedly once treatment was over, although there was a suggestion of an increase in second malignancies with venetoclax-obinutuzumab.

“We’ve seen, in many studies now that use fixed-duration approaches, that there is virtually no posttreatment toxicity once patients are able to get off treatment,” Dr. Al-Sawaf said, adding: “This really highlights the benefit” of stopping treatment, “which is a clear advantage compared to having any kind of continuous treatment.”

Approached for comment, William G. Wierda, MD, PhD, professor, department of leukemia, division of cancer medicine, University of Texas MD Anderson Cancer Center, Houston, emphasized the value of the 6-year follow-up of the study, adding that these are “very impressive data.”

He told this news organization that, in terms of the ongoing PFS improvement, “we wouldn’t expect anything otherwise” with venetoclax-obinutuzumab when compared with the chemotherapy-based regimen, but that the trend for an improvement in overall survival is of particular interest.

This “is a notable feature of the update,” Dr. Wierda said, and “we will continue to watch the long-term overall survival curves with a longer follow-up,” especially as the separation of the curves between the two regimens is “more prominent” than in previous analyses of CLL14.

He also pointed to the low incidence of grade ≥ 3 adverse events in patients who are in remission, which “support the use of fixed-duration chemo-free” treatments, and the longer follow-up now allowing the contribution of high-risk features to outcomes to be teased out in multivariate analysis.

“The data that we’re looking for in the next update of this is some indication about improved outcomes between patients with a mutated and unmutated immunoglobulin heavy chain gene [IgHV], in regard to undetectable MRD [minimal residual disease] status,” Dr. Wierda said.

“We know that mutational status correlates with progression free survival,” he explained. “What we would like to see moving forward is how that is associated with undetectable MRD status at the end of treatment.”

Dr. Wierda said that the next hotly anticipated trial in the field is CLL17, which is comparing ibrutinib monotherapy to fixed-duration venetoclax-obinutuzumab to fixed-duration ibrutinib-venetoclax in patients with previously untreated CLL.

“That’s the next question: Is there any advantage of a BTK [Bruton’s tyrosine kinase] inhibitor with venetoclax over venetoclax plus the CD20 antibody?”

Dr. Al-Sawaf, in presenting the latest analysis, reminded the audience that CLL14 was a randomized phase 3 study focusing on patients with previously untreated CLL and coexisting conditions who were randomized to either venetoclax-obinutuzumab for six cycles, followed by six cycles of venetoclax, or chlorambucil-obinutuzumab for six cycles, followed by chlorambucil for six cycles.

The patients, who were enrolled between 2015 and 2016, were required to have a Cumulative Illness Rating Scale (CIRS) score > 6 and/or creatinine clearance < 70 mL/min, which Dr. Al-Sawaf explained serves as “indicator of the unfitness of the patients.”

A total of 432 patients took part in the study. The median age across the two treatment groups was 71-72 years, and the median total CIRS score was 8-9. The majority of patients (79%-80%) had Binet stage B or C CLL. An intermediate tumor lysis syndrome risk was identified in 64%-68%.

“We also had a fair share of patients with high-risk disease,” Dr. Al-Sawaf noted, with approximately 60% having an unmutated IGHV status, and 12% having a TP53 mutation, both of which are associated with a poorer prognosis.

He added that the “aim of these long-term observations that we try to do every year is not so much to do the comparisons to chlorambucil-obinutuzumab, which we appreciate is not necessarily a standard of care anymore,” but rather to understand the safety and effectiveness of venetoclax-obinutuzumab “in the long run, given that all patients are off treatment.”

Beginning with the safety data, Dr. Al-Sawaf showed that rates of grade ≥ 3 adverse events plummeted after the treatment period, with rates of neutropenia falling from 51.9% with venetoclax-obinutuzumab and 47.2% with chlorambucil-obinutuzumab during treatment to 3.8% and 1.9%, respectively, post treatment.

Similarly, rates of thrombocytopenia decreased from 14.2% on treatment to 0.5% off treatment in patients given venetoclax-obinutuzumab, and from 15.0% to 0.0% in the chlorambucil-obinutuzumab group.

One note of caution was sounded over the proportion of patients with at least one second primary malignancy following treatment, which was numerically higher with venetoclax-obinutuzumab, at 14.2% versus 8.4% with the chemotherapy-based regimen.

“But this is a rather a heterogeneous pattern of solid organ tumors and melanoma,” Dr. Al-Sawaf said, referring to the additional malignancies in the venetoclax-obinutuzumab arm. These included lung cancer, prostate cancer and breast cancer.

He said, however, there was no “specific pattern that we can really pinpoint ... and, importantly, the difference is not statistically significant.”

Turning to the efficacy outcomes, Dr. Al-Sawaf showed that, after median follow-up of 76.4 months, the separation in PFS between the two treatment arms continued, with the median PFS 76.2 months with venetoclax-obinutuzumab versus 36.4 months with chlorambucil-obinutuzumab, at a hazard ratio 0.40 (P < .0001).

The 6-year PFS rate in patients treated with venetoclax-obinutuzumab was 53.1% versus 21.7% with the chemotherapy-based regimen. Looking at the high-risk groups, Dr. Al-Sawaf reported that there was a similar pattern of benefit with venetoclax-obinutuzumab.

Among patients with a TP53 mutation, the median PFS was 51.9 months with the combination versus 20.8 months in those given chlorambucil-obinutuzumab, while the corresponding durations in patients with unmutated IGHV were 64.8 months and 26.9 months, respectively.

Multivariate analysis demonstrated that IGHV status was an independent predictor of PFS in patients treated with venetoclax-obinutuzumab, as was the presence of a TP53 mutation, and lymph node size ≥ 5 cm.

There was no significant difference in overall survival between the two treatment groups, although there was a numerical difference in 6-year overall survival rates, at 78.7% with the experimental combination versus 69.2% with chlorambucil-obinutuzumab.

Patients with a minimal residual disease (MRD) count ≥ 10-4 had a shorter overall survival than did those with MRD < 10-4.

“We are currently working up to understand which group of patients experiences these tremendous long term remissions,” Dr. Al-Sawaf said, “and we will keep you posted on this.”

He also showed that the time to next treatment (TTNT), defined as time to death or next anti-leukemic treatment, was significantly longer with venetoclax-obinutuzumab, with the median not reached before the current data lock versus 52.9 months with the chemotherapy-based regimen.

This equated to a hazard ratio in favor of the experimental combination of 0.44 (P < .0001), and a 6-year TTNT rate of 65.2% versus 37.1% for chlorambucil-obinutuzumab.

That second treatment was a Bruton’s tyrosine kinase inhibitor in 59.0% of cases in the venetoclax-obinutuzumab arm and 53.4% in the chlorambucil-obinutuzumab group.

Dr. Al-Sawaf noted, however, that 23.1% and 30.1%, respectively, of patients were given a chemotherapy or chemo-immunotherapy regimen, “which we nowadays would not necessarily consider a standard of care.”

“This ultimately reflects, as in many global clinical studies, the disparities that we still have across the world in terms of access to state-of-the-art therapies.”

The study was sponsored by Hoffmann–La Roche, and conducted in collaboration with AbbVie, and the German CLL Study Group. Dr. Al-Sawaf disclosed relationships with AbbVie, Adaptive, Ascentage, AstraZeneca, BeiGene, Gilead, Janssen, Lilly, and Roche.

Patients with chronic lymphocytic leukemia (CLL) – even those who have multiple comorbidities – experience long-term progression-free survival (PFS) benefits with 1 year of venetoclax plus obinutuzumab versus a chemotherapy-based regimen, a 6-year follow-up analysis from CLL14 showed. The research was presented June 9 at the annual meeting of the European Hematology Association.

Initial results from the trial were shown at the EHA 2019 annual meeting and reported at the time by this news organization.

They revealed that, among more than 430 CLL patients with a median age of over 70 years and multiple comorbidities, the combination of venetoclax, a B-cell lymphoma 2 protein blocker, plus obinutuzumab, an anti-CD20 monoclonal antibody, was associated with a 65% improvement in PFS, compared with chlorambucil, a chemotherapy agent, plus obinutuzumab.

On the strength of these findings, the venetoclax-obinutuzumab combination received Food and Drug Administration approval for previously untreated CLL and small lymphocytic lymphoma in March 2019.

The latest analysis, presented by Othman Al-Sawaf, MD, University Hospital of Cologne (Germany), showed that despite having just 12 cycles of treatment, patients treated with venetoclax-obinutuzumab continued to experience a significant PFS benefit over those given the chemotherapy-based regimen, including in high-risk patients, after more than 6 years of follow-up.

Dr. Al-Sawaf noted that more than 50% of patients given the experimental combination remained without a PFS event at the latest follow-up, and that over 60% had not required a second treatment, equating to a 66% reduction in the likelihood of needing a second treatment versus chlorambucil-obinutuzumab.

Dr. Al-Sawaf said at a press conference that, “clinically, the standard of care for any CLL if it is asymptomatic” is watch and wait, which is “true in the frontline setting, but also in the relapse setting.”

Therefore, these patients “do not need to initiate the next line of treatment, and that’s why time to next treatment is so interesting.”

He added that there also were no new safety signals, with adverse event rates dropping markedly once treatment was over, although there was a suggestion of an increase in second malignancies with venetoclax-obinutuzumab.

“We’ve seen, in many studies now that use fixed-duration approaches, that there is virtually no posttreatment toxicity once patients are able to get off treatment,” Dr. Al-Sawaf said, adding: “This really highlights the benefit” of stopping treatment, “which is a clear advantage compared to having any kind of continuous treatment.”

Approached for comment, William G. Wierda, MD, PhD, professor, department of leukemia, division of cancer medicine, University of Texas MD Anderson Cancer Center, Houston, emphasized the value of the 6-year follow-up of the study, adding that these are “very impressive data.”

He told this news organization that, in terms of the ongoing PFS improvement, “we wouldn’t expect anything otherwise” with venetoclax-obinutuzumab when compared with the chemotherapy-based regimen, but that the trend for an improvement in overall survival is of particular interest.

This “is a notable feature of the update,” Dr. Wierda said, and “we will continue to watch the long-term overall survival curves with a longer follow-up,” especially as the separation of the curves between the two regimens is “more prominent” than in previous analyses of CLL14.

He also pointed to the low incidence of grade ≥ 3 adverse events in patients who are in remission, which “support the use of fixed-duration chemo-free” treatments, and the longer follow-up now allowing the contribution of high-risk features to outcomes to be teased out in multivariate analysis.

“The data that we’re looking for in the next update of this is some indication about improved outcomes between patients with a mutated and unmutated immunoglobulin heavy chain gene [IgHV], in regard to undetectable MRD [minimal residual disease] status,” Dr. Wierda said.

“We know that mutational status correlates with progression free survival,” he explained. “What we would like to see moving forward is how that is associated with undetectable MRD status at the end of treatment.”

Dr. Wierda said that the next hotly anticipated trial in the field is CLL17, which is comparing ibrutinib monotherapy to fixed-duration venetoclax-obinutuzumab to fixed-duration ibrutinib-venetoclax in patients with previously untreated CLL.

“That’s the next question: Is there any advantage of a BTK [Bruton’s tyrosine kinase] inhibitor with venetoclax over venetoclax plus the CD20 antibody?”

Dr. Al-Sawaf, in presenting the latest analysis, reminded the audience that CLL14 was a randomized phase 3 study focusing on patients with previously untreated CLL and coexisting conditions who were randomized to either venetoclax-obinutuzumab for six cycles, followed by six cycles of venetoclax, or chlorambucil-obinutuzumab for six cycles, followed by chlorambucil for six cycles.

The patients, who were enrolled between 2015 and 2016, were required to have a Cumulative Illness Rating Scale (CIRS) score > 6 and/or creatinine clearance < 70 mL/min, which Dr. Al-Sawaf explained serves as “indicator of the unfitness of the patients.”

A total of 432 patients took part in the study. The median age across the two treatment groups was 71-72 years, and the median total CIRS score was 8-9. The majority of patients (79%-80%) had Binet stage B or C CLL. An intermediate tumor lysis syndrome risk was identified in 64%-68%.

“We also had a fair share of patients with high-risk disease,” Dr. Al-Sawaf noted, with approximately 60% having an unmutated IGHV status, and 12% having a TP53 mutation, both of which are associated with a poorer prognosis.

He added that the “aim of these long-term observations that we try to do every year is not so much to do the comparisons to chlorambucil-obinutuzumab, which we appreciate is not necessarily a standard of care anymore,” but rather to understand the safety and effectiveness of venetoclax-obinutuzumab “in the long run, given that all patients are off treatment.”

Beginning with the safety data, Dr. Al-Sawaf showed that rates of grade ≥ 3 adverse events plummeted after the treatment period, with rates of neutropenia falling from 51.9% with venetoclax-obinutuzumab and 47.2% with chlorambucil-obinutuzumab during treatment to 3.8% and 1.9%, respectively, post treatment.

Similarly, rates of thrombocytopenia decreased from 14.2% on treatment to 0.5% off treatment in patients given venetoclax-obinutuzumab, and from 15.0% to 0.0% in the chlorambucil-obinutuzumab group.

One note of caution was sounded over the proportion of patients with at least one second primary malignancy following treatment, which was numerically higher with venetoclax-obinutuzumab, at 14.2% versus 8.4% with the chemotherapy-based regimen.

“But this is a rather a heterogeneous pattern of solid organ tumors and melanoma,” Dr. Al-Sawaf said, referring to the additional malignancies in the venetoclax-obinutuzumab arm. These included lung cancer, prostate cancer and breast cancer.

He said, however, there was no “specific pattern that we can really pinpoint ... and, importantly, the difference is not statistically significant.”

Turning to the efficacy outcomes, Dr. Al-Sawaf showed that, after median follow-up of 76.4 months, the separation in PFS between the two treatment arms continued, with the median PFS 76.2 months with venetoclax-obinutuzumab versus 36.4 months with chlorambucil-obinutuzumab, at a hazard ratio 0.40 (P < .0001).

The 6-year PFS rate in patients treated with venetoclax-obinutuzumab was 53.1% versus 21.7% with the chemotherapy-based regimen. Looking at the high-risk groups, Dr. Al-Sawaf reported that there was a similar pattern of benefit with venetoclax-obinutuzumab.

Among patients with a TP53 mutation, the median PFS was 51.9 months with the combination versus 20.8 months in those given chlorambucil-obinutuzumab, while the corresponding durations in patients with unmutated IGHV were 64.8 months and 26.9 months, respectively.

Multivariate analysis demonstrated that IGHV status was an independent predictor of PFS in patients treated with venetoclax-obinutuzumab, as was the presence of a TP53 mutation, and lymph node size ≥ 5 cm.

There was no significant difference in overall survival between the two treatment groups, although there was a numerical difference in 6-year overall survival rates, at 78.7% with the experimental combination versus 69.2% with chlorambucil-obinutuzumab.

Patients with a minimal residual disease (MRD) count ≥ 10-4 had a shorter overall survival than did those with MRD < 10-4.

“We are currently working up to understand which group of patients experiences these tremendous long term remissions,” Dr. Al-Sawaf said, “and we will keep you posted on this.”

He also showed that the time to next treatment (TTNT), defined as time to death or next anti-leukemic treatment, was significantly longer with venetoclax-obinutuzumab, with the median not reached before the current data lock versus 52.9 months with the chemotherapy-based regimen.

This equated to a hazard ratio in favor of the experimental combination of 0.44 (P < .0001), and a 6-year TTNT rate of 65.2% versus 37.1% for chlorambucil-obinutuzumab.

That second treatment was a Bruton’s tyrosine kinase inhibitor in 59.0% of cases in the venetoclax-obinutuzumab arm and 53.4% in the chlorambucil-obinutuzumab group.

Dr. Al-Sawaf noted, however, that 23.1% and 30.1%, respectively, of patients were given a chemotherapy or chemo-immunotherapy regimen, “which we nowadays would not necessarily consider a standard of care.”

“This ultimately reflects, as in many global clinical studies, the disparities that we still have across the world in terms of access to state-of-the-art therapies.”

The study was sponsored by Hoffmann–La Roche, and conducted in collaboration with AbbVie, and the German CLL Study Group. Dr. Al-Sawaf disclosed relationships with AbbVie, Adaptive, Ascentage, AstraZeneca, BeiGene, Gilead, Janssen, Lilly, and Roche.

High-risk genetic features do not diminish the response to first-line, fixed-dose ibrutinib (Imbruvica) plus venetoclax (Venclexta) for chronic lymphocytic leukemia (CLL), according to the latest report from AbbVie’s CAPTIVATE trial.

In the new analysis, published in Clinical Cancer Research, investigators compared outcomes in 66 adults without genetic risk factors to 129 with deletion of 17p, mutated TP53, and/or unmutated immunoglobulin heavy chain, all of which are associated with poor outcomes and poor responses to chemoimmunotherapy.

Over 95% of patients responded regardless of risk factors, with complete response in 61% of patients with and 53% of subjects without high-risk features. Progression free-survival (PFS) lasted at least 3 years in 88% of the high-risk group and 92% of low-risk patients, with over 95% of patients in both groups alive at 3 years

“Since high-risk genetic features inform treatment selection, understanding the efficacy of fixed-duration ibrutinib plus venetoclax in patients with high-risk CLL is important to determine how this regimen fits in the first-line treatment algorithm for the disease,” hematologic oncologist John Allan, MD, a CLL specialist at Weill Cornell Medical Center in New York and the lead investigator, said in a press release from American Association for Cancer Research, publisher of CCR.

Although the analysis was not powered to perform statistical comparisons between the two groups, Dr. Allan said the results “support fixed-duration ibrutinib plus venetoclax as a treatment approach for this patient population.”

The press release also noted that the outcomes “compare favorably” to other upfront targeted therapy approaches for CLL.
 

Experts respond

Asked for comment, Thomas LeBlanc, MD, a hematologic oncologist at Duke University in Durham, N.C., said “the advent of some fixed duration regimens with novel therapies has been an exciting thing for patients especially, recognizing that at the start of treatment one already knows the completion date, and one can also thus forgo much of the potentially cumulative physical, psychological, and financial toxicity of an indefinite oral therapy.”

As for the new findings, he said they show “that even in this high-risk population ... we can achieve remarkable remission rates and levels of [minimal residual disease] negativity by combining the two best drug classes to date in CLL: BTK inhibitors and venetoclax.”

Another expert, hematologic oncologist John Byrd, MD, a leukemia specialist at the University of Cincinnati, was more cautious.

“These findings confirm the results of many other prior studies of targeted therapies where high complete response rates with absence of detectable disease is observed,” he said.

However, while “such therapeutic combinations for sure enable treatment discontinuation,” Dr. Byrd noted, they “lack long-term follow-up. Given the added toxicities associated with these combinations and lack of long-term follow up, use of treatments such as those brought forth in the CAPTIVATE trial should be considered only in the context of a well-designed clinical trial.”
 

Study details

The new findings follow previous reports of CAPTIVATE, which found strong first-line response across CLL patients but did not focus as specifically on patients with high-risk genetic features.

Subjects received three 28-day cycles of ibrutinib 420 mg/day followed by twelve 28-day cycles of ibrutinib plus venetoclax, with a 5-week venetoclax ramp-up to 400 mg/day.

Side effects were similar regardless of high-risk features and included, most commonly, diarrhea, neutropenia, nausea, and arthralgia. The most common grade 3/4 treatment-emergent adverse events were neutropenia in 36% of patients in both groups and hypertension in 9% of patients with and 3% of patients without high-risk features.

The study was funded by Pharmacyclics/AbbVie, maker/marketer of both ibrutinib and venetoclax. Investigators had numerous ties to the companies, including Dr. Allan, who reported grants and/or personal fees. Dr. LeBlanc reported speaker/consulting honoraria from AbbVie as well as institutional research funding. Dr. Byrd did not have any connections to the companies.

High-risk genetic features do not diminish the response to first-line, fixed-dose ibrutinib (Imbruvica) plus venetoclax (Venclexta) for chronic lymphocytic leukemia (CLL), according to the latest report from AbbVie’s CAPTIVATE trial.

In the new analysis, published in Clinical Cancer Research, investigators compared outcomes in 66 adults without genetic risk factors to 129 with deletion of 17p, mutated TP53, and/or unmutated immunoglobulin heavy chain, all of which are associated with poor outcomes and poor responses to chemoimmunotherapy.

Over 95% of patients responded regardless of risk factors, with complete response in 61% of patients with and 53% of subjects without high-risk features. Progression free-survival (PFS) lasted at least 3 years in 88% of the high-risk group and 92% of low-risk patients, with over 95% of patients in both groups alive at 3 years

“Since high-risk genetic features inform treatment selection, understanding the efficacy of fixed-duration ibrutinib plus venetoclax in patients with high-risk CLL is important to determine how this regimen fits in the first-line treatment algorithm for the disease,” hematologic oncologist John Allan, MD, a CLL specialist at Weill Cornell Medical Center in New York and the lead investigator, said in a press release from American Association for Cancer Research, publisher of CCR.

Although the analysis was not powered to perform statistical comparisons between the two groups, Dr. Allan said the results “support fixed-duration ibrutinib plus venetoclax as a treatment approach for this patient population.”

The press release also noted that the outcomes “compare favorably” to other upfront targeted therapy approaches for CLL.
 

Experts respond

Asked for comment, Thomas LeBlanc, MD, a hematologic oncologist at Duke University in Durham, N.C., said “the advent of some fixed duration regimens with novel therapies has been an exciting thing for patients especially, recognizing that at the start of treatment one already knows the completion date, and one can also thus forgo much of the potentially cumulative physical, psychological, and financial toxicity of an indefinite oral therapy.”

As for the new findings, he said they show “that even in this high-risk population ... we can achieve remarkable remission rates and levels of [minimal residual disease] negativity by combining the two best drug classes to date in CLL: BTK inhibitors and venetoclax.”

Another expert, hematologic oncologist John Byrd, MD, a leukemia specialist at the University of Cincinnati, was more cautious.

“These findings confirm the results of many other prior studies of targeted therapies where high complete response rates with absence of detectable disease is observed,” he said.

However, while “such therapeutic combinations for sure enable treatment discontinuation,” Dr. Byrd noted, they “lack long-term follow-up. Given the added toxicities associated with these combinations and lack of long-term follow up, use of treatments such as those brought forth in the CAPTIVATE trial should be considered only in the context of a well-designed clinical trial.”
 

Study details

The new findings follow previous reports of CAPTIVATE, which found strong first-line response across CLL patients but did not focus as specifically on patients with high-risk genetic features.

Subjects received three 28-day cycles of ibrutinib 420 mg/day followed by twelve 28-day cycles of ibrutinib plus venetoclax, with a 5-week venetoclax ramp-up to 400 mg/day.

Side effects were similar regardless of high-risk features and included, most commonly, diarrhea, neutropenia, nausea, and arthralgia. The most common grade 3/4 treatment-emergent adverse events were neutropenia in 36% of patients in both groups and hypertension in 9% of patients with and 3% of patients without high-risk features.

The study was funded by Pharmacyclics/AbbVie, maker/marketer of both ibrutinib and venetoclax. Investigators had numerous ties to the companies, including Dr. Allan, who reported grants and/or personal fees. Dr. LeBlanc reported speaker/consulting honoraria from AbbVie as well as institutional research funding. Dr. Byrd did not have any connections to the companies.

High-risk genetic features do not diminish the response to first-line, fixed-dose ibrutinib (Imbruvica) plus venetoclax (Venclexta) for chronic lymphocytic leukemia (CLL), according to the latest report from AbbVie’s CAPTIVATE trial.

In the new analysis, published in Clinical Cancer Research, investigators compared outcomes in 66 adults without genetic risk factors to 129 with deletion of 17p, mutated TP53, and/or unmutated immunoglobulin heavy chain, all of which are associated with poor outcomes and poor responses to chemoimmunotherapy.

Over 95% of patients responded regardless of risk factors, with complete response in 61% of patients with and 53% of subjects without high-risk features. Progression free-survival (PFS) lasted at least 3 years in 88% of the high-risk group and 92% of low-risk patients, with over 95% of patients in both groups alive at 3 years

“Since high-risk genetic features inform treatment selection, understanding the efficacy of fixed-duration ibrutinib plus venetoclax in patients with high-risk CLL is important to determine how this regimen fits in the first-line treatment algorithm for the disease,” hematologic oncologist John Allan, MD, a CLL specialist at Weill Cornell Medical Center in New York and the lead investigator, said in a press release from American Association for Cancer Research, publisher of CCR.

Although the analysis was not powered to perform statistical comparisons between the two groups, Dr. Allan said the results “support fixed-duration ibrutinib plus venetoclax as a treatment approach for this patient population.”

The press release also noted that the outcomes “compare favorably” to other upfront targeted therapy approaches for CLL.
 

Experts respond

Asked for comment, Thomas LeBlanc, MD, a hematologic oncologist at Duke University in Durham, N.C., said “the advent of some fixed duration regimens with novel therapies has been an exciting thing for patients especially, recognizing that at the start of treatment one already knows the completion date, and one can also thus forgo much of the potentially cumulative physical, psychological, and financial toxicity of an indefinite oral therapy.”

As for the new findings, he said they show “that even in this high-risk population ... we can achieve remarkable remission rates and levels of [minimal residual disease] negativity by combining the two best drug classes to date in CLL: BTK inhibitors and venetoclax.”

Another expert, hematologic oncologist John Byrd, MD, a leukemia specialist at the University of Cincinnati, was more cautious.

“These findings confirm the results of many other prior studies of targeted therapies where high complete response rates with absence of detectable disease is observed,” he said.

However, while “such therapeutic combinations for sure enable treatment discontinuation,” Dr. Byrd noted, they “lack long-term follow-up. Given the added toxicities associated with these combinations and lack of long-term follow up, use of treatments such as those brought forth in the CAPTIVATE trial should be considered only in the context of a well-designed clinical trial.”
 

Study details

The new findings follow previous reports of CAPTIVATE, which found strong first-line response across CLL patients but did not focus as specifically on patients with high-risk genetic features.

Subjects received three 28-day cycles of ibrutinib 420 mg/day followed by twelve 28-day cycles of ibrutinib plus venetoclax, with a 5-week venetoclax ramp-up to 400 mg/day.

Side effects were similar regardless of high-risk features and included, most commonly, diarrhea, neutropenia, nausea, and arthralgia. The most common grade 3/4 treatment-emergent adverse events were neutropenia in 36% of patients in both groups and hypertension in 9% of patients with and 3% of patients without high-risk features.

The study was funded by Pharmacyclics/AbbVie, maker/marketer of both ibrutinib and venetoclax. Investigators had numerous ties to the companies, including Dr. Allan, who reported grants and/or personal fees. Dr. LeBlanc reported speaker/consulting honoraria from AbbVie as well as institutional research funding. Dr. Byrd did not have any connections to the companies.

The CD19-directed chimeric antigen receptor (CAR) T-cell therapy lisocabtagene maraleucel (liso-cel, Bristol-Myers Squibb), showed efficacy in achieving complete responses among patients with relapsed or refractory chronic lymphocytic leukemia (r/r CLL) or small lymphocytic lymphoma (SLL), after treatment with a Bruton kinase inhibitor (BTKi) and BCL2 inhibitor.

The phase 1/2 TRANSCEND CLL 004 trial represents “the first pivotal multicenter trial to evaluate a CAR T-cell therapy in heavily pretreated patients with relapsed or refractory chronic lymphocytic leukemia or small lymphocytic lymphoma,” first author Tanya Siddiqi, MD, associate professor in the division of lymphoma, City of Hope National Medical Center, Duarte, Calif., said in a press statement in connection with her presentation at the annual meeting of the American Society of Clinical Oncology.

“The durable complete responses observed with liso-cel in the TRANSCEND CLL 004 trial are remarkable and represent a major step in bringing a personalized, T cell–based treatment approach delivered as a one-time infusion into clinical practice for a complex and historically incurable disease,” she said.

Real-world evidence shows that patients with CLL or SLL who have relapsed or are refractory to treatment with BTKi therapy can have progressively worse outcomes. Moreover, with few other treatment options, research shows that the median time from dual discontinuation of BTKi and venetoclax to subsequent treatment failure or death is just 5.6 months.

“We are seeing a subset of patients now who are progressing on BTK inhibitors and venetoclax, and there is a high, unmet medical need for new, more effective treatments in this patient population,” Dr. Siddiqi said.

With liso-cel showing efficacy in the treatment of large B-cell lymphoma and receiving approval from the Food and Drug Administration for the indication, the multicenter TRANSCEND CLL 004 trial was launched to investigate the therapy’s effects in r/r CLL/SLL.

In a safety set of 117 patients with r/r CLL or SLL who received at least two prior lines of therapy, including a BTKi, patients received a single target dose of either 50 (n=9) or 100 × 106 (n = 87) CAR-positive T cells.

The primary efficacy analysis set included 49 patients who were treated with the target dose of 100 x 10⁶ CAR-positive viable T cells of liso-cel.

With a median on-study follow-up of 21.1 months, the primary endpoint of a complete response (CR) and complete response was achieved among 18.4% (n = 9; P = .0006).

Among patients achieving a complete response, no disease progression or deaths were reported, with a median duration of response that was not reached.

The undetectable minimal residual disease (MRD) rate was 63.3% in blood and 59.2% in bone marrow, which was associated with progression-free survival.

The overall response rate was 42.9%, which was not statistically significant, and the median duration of an objective response was 35.3 months (95% confidence interval, 11.01 to not reached).

The median time to first response was 1.2 months, and the median time to first complete response was 3.0 months.

The results were consistent in the broader safety set of 117 patients, including those who were heavily pretreated with a median of five prior lines of therapy (range, 2-12) and high-risk disease, with a CR rate of 18.4%.

In terms of safety, no new safety signals were observed, and the treatment’s safety profile was manageable, the authors noted.

Cytokine release syndrome (CRS), common with CAR T-cell therapy, occurred in 85% of patients; however, most cases were low grade; 9% of cases were grade 3, and there were no grade 4 or 5 cases.

Neurologic events occurred among 45%, including grade 3 in 17.9% and grade 4 in 0.9%, with no cases of grade 5.

For treatment of the CRS, 69.2% of patients received tocilizumab and/or corticosteroids for the cases of CRS and neurological events.

Of 51 deaths that occurred while on the study, 43 occurred following liso-cel infusion, including 5 caused by treatment-emergent adverse events occurring within 90 days of liso-cel infusion.

One death was determined to be related to liso-cel, involving macrophage activation syndrome–hemophagocytic lymphohistiocytosis.

“The safety profile was manageable, with low rates of grade 3 or higher CRS and neurotoxicity,” Dr. Siddiqi said.

She noted that, as encouraging as the results are, work should continue regarding further improving survival for patients.

“We need to look at this population more closely to see how we can make it even better for them,” she said in her talk.

For instance, “do we need to add maintenance, or do we need to do something else with CAR T therapy? Because one shot of CAR T is buying them a lot of time – 6 or 12 months of progression-free survival, but maybe we can make it even better.”

Dr. Siddiqi noted that she has “a lot of patients” who received CAR T-cell therapy who have not progressed or relapsed after as long as 4 years.

“I also have some patients who did relapse at 3 or 3 and 1/2 years, but everybody is so thankful for having that time of several years without any treatment; without the need for continuous therapy or continuous doctors’ visits. It is actually priceless,” she said.
 

Largest data set to date

Commenting on the study, Jakub Svoboda, MD, agreed that the findings suggest an important role of liso-cel among the growing numbers of patients who progress despite standard therapies.

“This is an important study and the [results] are very relevant as there is a growing population of patients with CLL/SLL who stopped responding to both BTKi and venetoclax and have limited options,” Dr. Svoboda, a medical oncologist at Penn Medicine, and associate professor of medicine at the Hospital of the University of Pennsylvania, both in Philadelphia, said in an interview.

“Many of my CLL/SLL patients benefited from BTK inhibitors and venetoclax for years, but it is clear that these are not curative agents, and ultimately our patients need other effective therapeutic options,” he said. “We have seen reports of smaller single-site studies with different anti-CD19 CAR T-cell products used in CLL/SLL in the past, but this multisite study using liso-cel represents the largest data set in over 100 patients with median follow-up of 21 months.”

Liso-cel, like other CAR T-cell treatments – which are derived from patients’ own cells that are then reengineered and delivered via a one-time infusion – has a 4-1BB costimulatory domain. This has the effect of enhancing the expansion and persistence of the CAR T cells.

Significantly, the study establishes that CAR T-cell manufacturing in CLL/SLL patients is feasible on a large scale, “which is important, considering the unique T-lymphocyte biology in CLL/SLL,” Dr. Svoboda remarked.

In terms of efficacy, “I have been mostly impressed by the high degree of undetectable minimal residual disease and the duration of response in the cohort of patients who previously failed both BTKi and venetoclax,” he added. “While there are a few agents used or being developed for patients failing both BTKi and venetoclax, it appears that CAR T-cell therapy has the unique potential to achieve long-term remissions in a subset of these patients.”

Discussant Carolyn Owen, MD, an associate professor in the division of hematology and hematological malignancies, University of Calgary (Alta.), and hematologist at the Tom Baker Cancer Centre, also in Calgary, also expressed enthusiasm over the encouraging results.

“The results of this study are very exciting,” she said during her discussion in the session.

“What is really important is that, even though this may be a small proportion of all of the patients, if we start offering this therapy a little bit earlier, and don’t wait for people to become completely refractory, we could increase the proportion of patients who are [not relapsing].”

Furthermore, “what’s most groundbreaking about this study is that patients could indeed have a really durable remission,” Dr. Owen added. “Hopefully not relapsing even beyond this 20-month follow up, which we haven’t seen with any of our other therapies.”

The results were also published in The Lancet.

The study was sponsored by Juno Therapeutics. Dr. Siddiqi disclosed relationships with Acerta Pharma, Ascentage Pharma, AstraZeneca, BeiGene, Bristol-Myers Squibb/Sanofi, Celgene, Juno Therapeutics, Kite, Oncternal Therapeutics, Pharmacyclics, and TG Therapeutics. Dr. Svoboda reported ties with Bristol-Myers Squibb. Dr. Owen disclosed relationships with Janssen, AstraZeneca, Roche Canada, AbbVie, Novartis Canada Pharmaceuticals, BeiGene, Merck, Incyte, and Seagen.

The CD19-directed chimeric antigen receptor (CAR) T-cell therapy lisocabtagene maraleucel (liso-cel, Bristol-Myers Squibb), showed efficacy in achieving complete responses among patients with relapsed or refractory chronic lymphocytic leukemia (r/r CLL) or small lymphocytic lymphoma (SLL), after treatment with a Bruton kinase inhibitor (BTKi) and BCL2 inhibitor.

The phase 1/2 TRANSCEND CLL 004 trial represents “the first pivotal multicenter trial to evaluate a CAR T-cell therapy in heavily pretreated patients with relapsed or refractory chronic lymphocytic leukemia or small lymphocytic lymphoma,” first author Tanya Siddiqi, MD, associate professor in the division of lymphoma, City of Hope National Medical Center, Duarte, Calif., said in a press statement in connection with her presentation at the annual meeting of the American Society of Clinical Oncology.

“The durable complete responses observed with liso-cel in the TRANSCEND CLL 004 trial are remarkable and represent a major step in bringing a personalized, T cell–based treatment approach delivered as a one-time infusion into clinical practice for a complex and historically incurable disease,” she said.

Real-world evidence shows that patients with CLL or SLL who have relapsed or are refractory to treatment with BTKi therapy can have progressively worse outcomes. Moreover, with few other treatment options, research shows that the median time from dual discontinuation of BTKi and venetoclax to subsequent treatment failure or death is just 5.6 months.

“We are seeing a subset of patients now who are progressing on BTK inhibitors and venetoclax, and there is a high, unmet medical need for new, more effective treatments in this patient population,” Dr. Siddiqi said.

With liso-cel showing efficacy in the treatment of large B-cell lymphoma and receiving approval from the Food and Drug Administration for the indication, the multicenter TRANSCEND CLL 004 trial was launched to investigate the therapy’s effects in r/r CLL/SLL.

In a safety set of 117 patients with r/r CLL or SLL who received at least two prior lines of therapy, including a BTKi, patients received a single target dose of either 50 (n=9) or 100 × 106 (n = 87) CAR-positive T cells.

The primary efficacy analysis set included 49 patients who were treated with the target dose of 100 x 10⁶ CAR-positive viable T cells of liso-cel.

With a median on-study follow-up of 21.1 months, the primary endpoint of a complete response (CR) and complete response was achieved among 18.4% (n = 9; P = .0006).

Among patients achieving a complete response, no disease progression or deaths were reported, with a median duration of response that was not reached.

The undetectable minimal residual disease (MRD) rate was 63.3% in blood and 59.2% in bone marrow, which was associated with progression-free survival.

The overall response rate was 42.9%, which was not statistically significant, and the median duration of an objective response was 35.3 months (95% confidence interval, 11.01 to not reached).

The median time to first response was 1.2 months, and the median time to first complete response was 3.0 months.

The results were consistent in the broader safety set of 117 patients, including those who were heavily pretreated with a median of five prior lines of therapy (range, 2-12) and high-risk disease, with a CR rate of 18.4%.

In terms of safety, no new safety signals were observed, and the treatment’s safety profile was manageable, the authors noted.

Cytokine release syndrome (CRS), common with CAR T-cell therapy, occurred in 85% of patients; however, most cases were low grade; 9% of cases were grade 3, and there were no grade 4 or 5 cases.

Neurologic events occurred among 45%, including grade 3 in 17.9% and grade 4 in 0.9%, with no cases of grade 5.

For treatment of the CRS, 69.2% of patients received tocilizumab and/or corticosteroids for the cases of CRS and neurological events.

Of 51 deaths that occurred while on the study, 43 occurred following liso-cel infusion, including 5 caused by treatment-emergent adverse events occurring within 90 days of liso-cel infusion.

One death was determined to be related to liso-cel, involving macrophage activation syndrome–hemophagocytic lymphohistiocytosis.

“The safety profile was manageable, with low rates of grade 3 or higher CRS and neurotoxicity,” Dr. Siddiqi said.

She noted that, as encouraging as the results are, work should continue regarding further improving survival for patients.

“We need to look at this population more closely to see how we can make it even better for them,” she said in her talk.

For instance, “do we need to add maintenance, or do we need to do something else with CAR T therapy? Because one shot of CAR T is buying them a lot of time – 6 or 12 months of progression-free survival, but maybe we can make it even better.”

Dr. Siddiqi noted that she has “a lot of patients” who received CAR T-cell therapy who have not progressed or relapsed after as long as 4 years.

“I also have some patients who did relapse at 3 or 3 and 1/2 years, but everybody is so thankful for having that time of several years without any treatment; without the need for continuous therapy or continuous doctors’ visits. It is actually priceless,” she said.
 

Largest data set to date

Commenting on the study, Jakub Svoboda, MD, agreed that the findings suggest an important role of liso-cel among the growing numbers of patients who progress despite standard therapies.

“This is an important study and the [results] are very relevant as there is a growing population of patients with CLL/SLL who stopped responding to both BTKi and venetoclax and have limited options,” Dr. Svoboda, a medical oncologist at Penn Medicine, and associate professor of medicine at the Hospital of the University of Pennsylvania, both in Philadelphia, said in an interview.

“Many of my CLL/SLL patients benefited from BTK inhibitors and venetoclax for years, but it is clear that these are not curative agents, and ultimately our patients need other effective therapeutic options,” he said. “We have seen reports of smaller single-site studies with different anti-CD19 CAR T-cell products used in CLL/SLL in the past, but this multisite study using liso-cel represents the largest data set in over 100 patients with median follow-up of 21 months.”

Liso-cel, like other CAR T-cell treatments – which are derived from patients’ own cells that are then reengineered and delivered via a one-time infusion – has a 4-1BB costimulatory domain. This has the effect of enhancing the expansion and persistence of the CAR T cells.

Significantly, the study establishes that CAR T-cell manufacturing in CLL/SLL patients is feasible on a large scale, “which is important, considering the unique T-lymphocyte biology in CLL/SLL,” Dr. Svoboda remarked.

In terms of efficacy, “I have been mostly impressed by the high degree of undetectable minimal residual disease and the duration of response in the cohort of patients who previously failed both BTKi and venetoclax,” he added. “While there are a few agents used or being developed for patients failing both BTKi and venetoclax, it appears that CAR T-cell therapy has the unique potential to achieve long-term remissions in a subset of these patients.”

Discussant Carolyn Owen, MD, an associate professor in the division of hematology and hematological malignancies, University of Calgary (Alta.), and hematologist at the Tom Baker Cancer Centre, also in Calgary, also expressed enthusiasm over the encouraging results.

“The results of this study are very exciting,” she said during her discussion in the session.

“What is really important is that, even though this may be a small proportion of all of the patients, if we start offering this therapy a little bit earlier, and don’t wait for people to become completely refractory, we could increase the proportion of patients who are [not relapsing].”

Furthermore, “what’s most groundbreaking about this study is that patients could indeed have a really durable remission,” Dr. Owen added. “Hopefully not relapsing even beyond this 20-month follow up, which we haven’t seen with any of our other therapies.”

The results were also published in The Lancet.

The study was sponsored by Juno Therapeutics. Dr. Siddiqi disclosed relationships with Acerta Pharma, Ascentage Pharma, AstraZeneca, BeiGene, Bristol-Myers Squibb/Sanofi, Celgene, Juno Therapeutics, Kite, Oncternal Therapeutics, Pharmacyclics, and TG Therapeutics. Dr. Svoboda reported ties with Bristol-Myers Squibb. Dr. Owen disclosed relationships with Janssen, AstraZeneca, Roche Canada, AbbVie, Novartis Canada Pharmaceuticals, BeiGene, Merck, Incyte, and Seagen.

The CD19-directed chimeric antigen receptor (CAR) T-cell therapy lisocabtagene maraleucel (liso-cel, Bristol-Myers Squibb), showed efficacy in achieving complete responses among patients with relapsed or refractory chronic lymphocytic leukemia (r/r CLL) or small lymphocytic lymphoma (SLL), after treatment with a Bruton kinase inhibitor (BTKi) and BCL2 inhibitor.

The phase 1/2 TRANSCEND CLL 004 trial represents “the first pivotal multicenter trial to evaluate a CAR T-cell therapy in heavily pretreated patients with relapsed or refractory chronic lymphocytic leukemia or small lymphocytic lymphoma,” first author Tanya Siddiqi, MD, associate professor in the division of lymphoma, City of Hope National Medical Center, Duarte, Calif., said in a press statement in connection with her presentation at the annual meeting of the American Society of Clinical Oncology.

“The durable complete responses observed with liso-cel in the TRANSCEND CLL 004 trial are remarkable and represent a major step in bringing a personalized, T cell–based treatment approach delivered as a one-time infusion into clinical practice for a complex and historically incurable disease,” she said.

Real-world evidence shows that patients with CLL or SLL who have relapsed or are refractory to treatment with BTKi therapy can have progressively worse outcomes. Moreover, with few other treatment options, research shows that the median time from dual discontinuation of BTKi and venetoclax to subsequent treatment failure or death is just 5.6 months.

“We are seeing a subset of patients now who are progressing on BTK inhibitors and venetoclax, and there is a high, unmet medical need for new, more effective treatments in this patient population,” Dr. Siddiqi said.

With liso-cel showing efficacy in the treatment of large B-cell lymphoma and receiving approval from the Food and Drug Administration for the indication, the multicenter TRANSCEND CLL 004 trial was launched to investigate the therapy’s effects in r/r CLL/SLL.

In a safety set of 117 patients with r/r CLL or SLL who received at least two prior lines of therapy, including a BTKi, patients received a single target dose of either 50 (n=9) or 100 × 106 (n = 87) CAR-positive T cells.

The primary efficacy analysis set included 49 patients who were treated with the target dose of 100 x 10⁶ CAR-positive viable T cells of liso-cel.

With a median on-study follow-up of 21.1 months, the primary endpoint of a complete response (CR) and complete response was achieved among 18.4% (n = 9; P = .0006).

Among patients achieving a complete response, no disease progression or deaths were reported, with a median duration of response that was not reached.

The undetectable minimal residual disease (MRD) rate was 63.3% in blood and 59.2% in bone marrow, which was associated with progression-free survival.

The overall response rate was 42.9%, which was not statistically significant, and the median duration of an objective response was 35.3 months (95% confidence interval, 11.01 to not reached).

The median time to first response was 1.2 months, and the median time to first complete response was 3.0 months.

The results were consistent in the broader safety set of 117 patients, including those who were heavily pretreated with a median of five prior lines of therapy (range, 2-12) and high-risk disease, with a CR rate of 18.4%.

In terms of safety, no new safety signals were observed, and the treatment’s safety profile was manageable, the authors noted.

Cytokine release syndrome (CRS), common with CAR T-cell therapy, occurred in 85% of patients; however, most cases were low grade; 9% of cases were grade 3, and there were no grade 4 or 5 cases.

Neurologic events occurred among 45%, including grade 3 in 17.9% and grade 4 in 0.9%, with no cases of grade 5.

For treatment of the CRS, 69.2% of patients received tocilizumab and/or corticosteroids for the cases of CRS and neurological events.

Of 51 deaths that occurred while on the study, 43 occurred following liso-cel infusion, including 5 caused by treatment-emergent adverse events occurring within 90 days of liso-cel infusion.

One death was determined to be related to liso-cel, involving macrophage activation syndrome–hemophagocytic lymphohistiocytosis.

“The safety profile was manageable, with low rates of grade 3 or higher CRS and neurotoxicity,” Dr. Siddiqi said.

She noted that, as encouraging as the results are, work should continue regarding further improving survival for patients.

“We need to look at this population more closely to see how we can make it even better for them,” she said in her talk.

For instance, “do we need to add maintenance, or do we need to do something else with CAR T therapy? Because one shot of CAR T is buying them a lot of time – 6 or 12 months of progression-free survival, but maybe we can make it even better.”

Dr. Siddiqi noted that she has “a lot of patients” who received CAR T-cell therapy who have not progressed or relapsed after as long as 4 years.

“I also have some patients who did relapse at 3 or 3 and 1/2 years, but everybody is so thankful for having that time of several years without any treatment; without the need for continuous therapy or continuous doctors’ visits. It is actually priceless,” she said.
 

Largest data set to date

Commenting on the study, Jakub Svoboda, MD, agreed that the findings suggest an important role of liso-cel among the growing numbers of patients who progress despite standard therapies.

“This is an important study and the [results] are very relevant as there is a growing population of patients with CLL/SLL who stopped responding to both BTKi and venetoclax and have limited options,” Dr. Svoboda, a medical oncologist at Penn Medicine, and associate professor of medicine at the Hospital of the University of Pennsylvania, both in Philadelphia, said in an interview.

“Many of my CLL/SLL patients benefited from BTK inhibitors and venetoclax for years, but it is clear that these are not curative agents, and ultimately our patients need other effective therapeutic options,” he said. “We have seen reports of smaller single-site studies with different anti-CD19 CAR T-cell products used in CLL/SLL in the past, but this multisite study using liso-cel represents the largest data set in over 100 patients with median follow-up of 21 months.”

Liso-cel, like other CAR T-cell treatments – which are derived from patients’ own cells that are then reengineered and delivered via a one-time infusion – has a 4-1BB costimulatory domain. This has the effect of enhancing the expansion and persistence of the CAR T cells.

Significantly, the study establishes that CAR T-cell manufacturing in CLL/SLL patients is feasible on a large scale, “which is important, considering the unique T-lymphocyte biology in CLL/SLL,” Dr. Svoboda remarked.

In terms of efficacy, “I have been mostly impressed by the high degree of undetectable minimal residual disease and the duration of response in the cohort of patients who previously failed both BTKi and venetoclax,” he added. “While there are a few agents used or being developed for patients failing both BTKi and venetoclax, it appears that CAR T-cell therapy has the unique potential to achieve long-term remissions in a subset of these patients.”

Discussant Carolyn Owen, MD, an associate professor in the division of hematology and hematological malignancies, University of Calgary (Alta.), and hematologist at the Tom Baker Cancer Centre, also in Calgary, also expressed enthusiasm over the encouraging results.

“The results of this study are very exciting,” she said during her discussion in the session.

“What is really important is that, even though this may be a small proportion of all of the patients, if we start offering this therapy a little bit earlier, and don’t wait for people to become completely refractory, we could increase the proportion of patients who are [not relapsing].”

Furthermore, “what’s most groundbreaking about this study is that patients could indeed have a really durable remission,” Dr. Owen added. “Hopefully not relapsing even beyond this 20-month follow up, which we haven’t seen with any of our other therapies.”

The results were also published in The Lancet.

The study was sponsored by Juno Therapeutics. Dr. Siddiqi disclosed relationships with Acerta Pharma, Ascentage Pharma, AstraZeneca, BeiGene, Bristol-Myers Squibb/Sanofi, Celgene, Juno Therapeutics, Kite, Oncternal Therapeutics, Pharmacyclics, and TG Therapeutics. Dr. Svoboda reported ties with Bristol-Myers Squibb. Dr. Owen disclosed relationships with Janssen, AstraZeneca, Roche Canada, AbbVie, Novartis Canada Pharmaceuticals, BeiGene, Merck, Incyte, and Seagen.

For patients with primary mediastinal B-cell lymphoma (PMBCL) who achieved a complete metabolic response after immunochemotherapy, radiation therapy may be safely omitted without heightening their risks of relapse or disease progression – thereby sparing them the toxicity and costs of this additional treatment.

“This study is the largest prospective study of PMBCL ever conducted,” said first author Emanuele Zucca, MD, consultant and head of the lymphoma unit at the Oncology Institute of Southern Switzerland in Bellinzona. Dr. Zucca presented the findings at the annual meeting of the American Society of Clinical Oncology (ASCO).

The results of the research underscore that “mediastinal radiation therapy in patients with complete remission after frontline immunochemotherapy can be safely omitted,” he said.

While PMBCL has a relatively low incidence, representing fewer than 5% of cases of non-Hodgkin lymphoma, the cancer is over-represented in young White women between approximately 30 and 40 years of age, and is a notably aggressive form of diffuse large B-cell lymphoma.

However, in patients who rapidly achieve remission with dose-intensive immunochemotherapy, the prognosis is good.

In such cases, the use of mediastinal radiation therapy has been seen as a measure to further consolidate the immunochemotherapy response, but the additional treatment comes at the cost of an increased risk of second malignancies, as well as coronary or valvular heart disease.

Meanwhile, in recent decades promising data has shown that aggressive chemoimmunotherapy regimens alone, such as DA-EPOCH-R (dose-adjusted etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab) can be enough for patients achieving a complete remission, while novel approaches such as checkpoint inhibitors and CAR T-cell therapy further show benefits in patients with lymphoma that relapses after treatment.

With ongoing controversy over whether to include the added radiation therapy among patients with a complete metabolic response, Dr. Zucca and his colleagues conducted the IELSG37 international study, enrolling 545 patients from 74 centers in 13 countries, including 336 women, with newly diagnosed PMBCL.

The patients were treated with induction chemoimmunotherapy with rituximab and anthracycline-based therapy based on local practice, and response assessed among of 530 of the 545 patients showed that 268 (50.6%) achieved a complete metabolic response.

Those patients were then randomized to either observation (n = 132) or consolidation radiation therapy (30 Gy; n = 136). The characteristics between the two groups were similar, with a mean age of 35.5, and about 65% female.

With a median follow-up of 63 months (range, 48-60 months), the primary endpoint of progression-free survival at 30 months was not significantly different between the observation arm (98.5%) and radiation therapy arm (96.2%; P = .278).

After adjustment for factors including sex, chemotherapy, country, and positron emission tomography (PET) response score, the estimated relative effect of radiotherapy versus observation was a hazard ratio of 0.68, and the absolute risk reduction associated with radiotherapy at 30 months was 1.2% after adjustment.

The number needed to treat is high, at 126.3 after stratification, and the 5-year overall survival was excellent in both arms, at 99%.

“What this tells us is that treatment with radiation therapy in well over 100 patients is needed just to avoid a single recurrence,” Dr. Zucca explained.

Overall survival after 3 years was excellent and identical in both arms, at about 99%.

To date, three severe cardiac events and three second cancers have been recorded in the study, all occurring among patients randomized to receive radiation therapy.

Dr. Zucca noted that longer follow-up is needed to better examine late toxicities.

“The long-term toxicities of mediastinal radiotherapy are well documented, particularly second breast, thyroid, and lung cancers and increased risk of coronary or valvular heart disease, in a patient group dominated by young adults,” Dr. Zucca said in a press statement.

“This study shows chemoimmunotherapy alone is an effective treatment for primary mediastinal B-cell lymphoma and strongly supports omitting radiotherapy without impacting chances of cure.”

Commenting on the study, Corey W. Speers, MD, PhD, assistant professor, radiation oncology, department of surgery, University of Michigan Hospital, Ann Arbor, said the findings have important clinical implications.

“We all should be encouraged by the low rates in this trial, which are lower than expected,” Dr. Speers said in a press briefing.

In further comments, he added that “these results will inform and likely change clinical practice.”

Dr. Speers said the study is notable for being the first of its kind.

“This clinical question has not previously been directly addressed, and this is the first study to do so,” he said.

“With more effective systemic therapies, many patients have their lymphoma disappear with early aggressive treatment, and although radiation is very effective at treating lymphoma, it has not been clear if it is needed in these patients that have an early rapid response to systemic therapy before starting radiation,” Dr. Speers explained.

“We have struggled as oncologists to know whether omitting this effective radiotherapy would compromise outcomes, and thus many were inclined to continue offering it to patients, even with the great early response. This study helps answer this critical question,” he said.

The results add reassuring evidence, buttressing efforts to avoid unnecessary interventions that may provide little or no benefit, Dr. Speers added.

“We are now in an era of ‘less being more’ as we seek ways to provide optimal quality and quantity of life to patients with cancer and their families, and this is just another example of the tremendous progress being made.”

Further commenting on the study at the press briefing, Julie R. Gralow, MD, ASCO chief medical officer and executive vice president, said the research supports ASCO’s ongoing efforts to reduce the toxicities of cancer treatment.

“Our ASCO vision is a world where cancer is either prevented or cured, and every patient is cured – and every survivor is healthy, and that part about every survivor being healthy is what we’re working on here [in this study],” Dr. Gralow said.

The study was funded by the Swiss Cancer League and Cancer Research UK, with partial support from the Swiss National Science Foundation. Dr. Zucca reported relationships with AstraZeneca, Beigene, Celgene, Incyte, Janssen, Merck, Roche, Celltrion Healthcare, Kite, and Abbvie. Dr. Speers disclosed his coinvention of technology that assesses radiosensitivity and predicts benefits from adjutant radiotherapy.

For patients with primary mediastinal B-cell lymphoma (PMBCL) who achieved a complete metabolic response after immunochemotherapy, radiation therapy may be safely omitted without heightening their risks of relapse or disease progression – thereby sparing them the toxicity and costs of this additional treatment.

“This study is the largest prospective study of PMBCL ever conducted,” said first author Emanuele Zucca, MD, consultant and head of the lymphoma unit at the Oncology Institute of Southern Switzerland in Bellinzona. Dr. Zucca presented the findings at the annual meeting of the American Society of Clinical Oncology (ASCO).

The results of the research underscore that “mediastinal radiation therapy in patients with complete remission after frontline immunochemotherapy can be safely omitted,” he said.

While PMBCL has a relatively low incidence, representing fewer than 5% of cases of non-Hodgkin lymphoma, the cancer is over-represented in young White women between approximately 30 and 40 years of age, and is a notably aggressive form of diffuse large B-cell lymphoma.

However, in patients who rapidly achieve remission with dose-intensive immunochemotherapy, the prognosis is good.

In such cases, the use of mediastinal radiation therapy has been seen as a measure to further consolidate the immunochemotherapy response, but the additional treatment comes at the cost of an increased risk of second malignancies, as well as coronary or valvular heart disease.

Meanwhile, in recent decades promising data has shown that aggressive chemoimmunotherapy regimens alone, such as DA-EPOCH-R (dose-adjusted etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab) can be enough for patients achieving a complete remission, while novel approaches such as checkpoint inhibitors and CAR T-cell therapy further show benefits in patients with lymphoma that relapses after treatment.

With ongoing controversy over whether to include the added radiation therapy among patients with a complete metabolic response, Dr. Zucca and his colleagues conducted the IELSG37 international study, enrolling 545 patients from 74 centers in 13 countries, including 336 women, with newly diagnosed PMBCL.

The patients were treated with induction chemoimmunotherapy with rituximab and anthracycline-based therapy based on local practice, and response assessed among of 530 of the 545 patients showed that 268 (50.6%) achieved a complete metabolic response.

Those patients were then randomized to either observation (n = 132) or consolidation radiation therapy (30 Gy; n = 136). The characteristics between the two groups were similar, with a mean age of 35.5, and about 65% female.

With a median follow-up of 63 months (range, 48-60 months), the primary endpoint of progression-free survival at 30 months was not significantly different between the observation arm (98.5%) and radiation therapy arm (96.2%; P = .278).

After adjustment for factors including sex, chemotherapy, country, and positron emission tomography (PET) response score, the estimated relative effect of radiotherapy versus observation was a hazard ratio of 0.68, and the absolute risk reduction associated with radiotherapy at 30 months was 1.2% after adjustment.

The number needed to treat is high, at 126.3 after stratification, and the 5-year overall survival was excellent in both arms, at 99%.

“What this tells us is that treatment with radiation therapy in well over 100 patients is needed just to avoid a single recurrence,” Dr. Zucca explained.

Overall survival after 3 years was excellent and identical in both arms, at about 99%.

To date, three severe cardiac events and three second cancers have been recorded in the study, all occurring among patients randomized to receive radiation therapy.

Dr. Zucca noted that longer follow-up is needed to better examine late toxicities.

“The long-term toxicities of mediastinal radiotherapy are well documented, particularly second breast, thyroid, and lung cancers and increased risk of coronary or valvular heart disease, in a patient group dominated by young adults,” Dr. Zucca said in a press statement.

“This study shows chemoimmunotherapy alone is an effective treatment for primary mediastinal B-cell lymphoma and strongly supports omitting radiotherapy without impacting chances of cure.”

Commenting on the study, Corey W. Speers, MD, PhD, assistant professor, radiation oncology, department of surgery, University of Michigan Hospital, Ann Arbor, said the findings have important clinical implications.

“We all should be encouraged by the low rates in this trial, which are lower than expected,” Dr. Speers said in a press briefing.

In further comments, he added that “these results will inform and likely change clinical practice.”

Dr. Speers said the study is notable for being the first of its kind.

“This clinical question has not previously been directly addressed, and this is the first study to do so,” he said.

“With more effective systemic therapies, many patients have their lymphoma disappear with early aggressive treatment, and although radiation is very effective at treating lymphoma, it has not been clear if it is needed in these patients that have an early rapid response to systemic therapy before starting radiation,” Dr. Speers explained.

“We have struggled as oncologists to know whether omitting this effective radiotherapy would compromise outcomes, and thus many were inclined to continue offering it to patients, even with the great early response. This study helps answer this critical question,” he said.

The results add reassuring evidence, buttressing efforts to avoid unnecessary interventions that may provide little or no benefit, Dr. Speers added.

“We are now in an era of ‘less being more’ as we seek ways to provide optimal quality and quantity of life to patients with cancer and their families, and this is just another example of the tremendous progress being made.”

Further commenting on the study at the press briefing, Julie R. Gralow, MD, ASCO chief medical officer and executive vice president, said the research supports ASCO’s ongoing efforts to reduce the toxicities of cancer treatment.

“Our ASCO vision is a world where cancer is either prevented or cured, and every patient is cured – and every survivor is healthy, and that part about every survivor being healthy is what we’re working on here [in this study],” Dr. Gralow said.

The study was funded by the Swiss Cancer League and Cancer Research UK, with partial support from the Swiss National Science Foundation. Dr. Zucca reported relationships with AstraZeneca, Beigene, Celgene, Incyte, Janssen, Merck, Roche, Celltrion Healthcare, Kite, and Abbvie. Dr. Speers disclosed his coinvention of technology that assesses radiosensitivity and predicts benefits from adjutant radiotherapy.

For patients with primary mediastinal B-cell lymphoma (PMBCL) who achieved a complete metabolic response after immunochemotherapy, radiation therapy may be safely omitted without heightening their risks of relapse or disease progression – thereby sparing them the toxicity and costs of this additional treatment.

“This study is the largest prospective study of PMBCL ever conducted,” said first author Emanuele Zucca, MD, consultant and head of the lymphoma unit at the Oncology Institute of Southern Switzerland in Bellinzona. Dr. Zucca presented the findings at the annual meeting of the American Society of Clinical Oncology (ASCO).

The results of the research underscore that “mediastinal radiation therapy in patients with complete remission after frontline immunochemotherapy can be safely omitted,” he said.

While PMBCL has a relatively low incidence, representing fewer than 5% of cases of non-Hodgkin lymphoma, the cancer is over-represented in young White women between approximately 30 and 40 years of age, and is a notably aggressive form of diffuse large B-cell lymphoma.

However, in patients who rapidly achieve remission with dose-intensive immunochemotherapy, the prognosis is good.

In such cases, the use of mediastinal radiation therapy has been seen as a measure to further consolidate the immunochemotherapy response, but the additional treatment comes at the cost of an increased risk of second malignancies, as well as coronary or valvular heart disease.

Meanwhile, in recent decades promising data has shown that aggressive chemoimmunotherapy regimens alone, such as DA-EPOCH-R (dose-adjusted etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab) can be enough for patients achieving a complete remission, while novel approaches such as checkpoint inhibitors and CAR T-cell therapy further show benefits in patients with lymphoma that relapses after treatment.

With ongoing controversy over whether to include the added radiation therapy among patients with a complete metabolic response, Dr. Zucca and his colleagues conducted the IELSG37 international study, enrolling 545 patients from 74 centers in 13 countries, including 336 women, with newly diagnosed PMBCL.

The patients were treated with induction chemoimmunotherapy with rituximab and anthracycline-based therapy based on local practice, and response assessed among of 530 of the 545 patients showed that 268 (50.6%) achieved a complete metabolic response.

Those patients were then randomized to either observation (n = 132) or consolidation radiation therapy (30 Gy; n = 136). The characteristics between the two groups were similar, with a mean age of 35.5, and about 65% female.

With a median follow-up of 63 months (range, 48-60 months), the primary endpoint of progression-free survival at 30 months was not significantly different between the observation arm (98.5%) and radiation therapy arm (96.2%; P = .278).

After adjustment for factors including sex, chemotherapy, country, and positron emission tomography (PET) response score, the estimated relative effect of radiotherapy versus observation was a hazard ratio of 0.68, and the absolute risk reduction associated with radiotherapy at 30 months was 1.2% after adjustment.

The number needed to treat is high, at 126.3 after stratification, and the 5-year overall survival was excellent in both arms, at 99%.

“What this tells us is that treatment with radiation therapy in well over 100 patients is needed just to avoid a single recurrence,” Dr. Zucca explained.

Overall survival after 3 years was excellent and identical in both arms, at about 99%.

To date, three severe cardiac events and three second cancers have been recorded in the study, all occurring among patients randomized to receive radiation therapy.

Dr. Zucca noted that longer follow-up is needed to better examine late toxicities.

“The long-term toxicities of mediastinal radiotherapy are well documented, particularly second breast, thyroid, and lung cancers and increased risk of coronary or valvular heart disease, in a patient group dominated by young adults,” Dr. Zucca said in a press statement.

“This study shows chemoimmunotherapy alone is an effective treatment for primary mediastinal B-cell lymphoma and strongly supports omitting radiotherapy without impacting chances of cure.”

Commenting on the study, Corey W. Speers, MD, PhD, assistant professor, radiation oncology, department of surgery, University of Michigan Hospital, Ann Arbor, said the findings have important clinical implications.

“We all should be encouraged by the low rates in this trial, which are lower than expected,” Dr. Speers said in a press briefing.

In further comments, he added that “these results will inform and likely change clinical practice.”

Dr. Speers said the study is notable for being the first of its kind.

“This clinical question has not previously been directly addressed, and this is the first study to do so,” he said.

“With more effective systemic therapies, many patients have their lymphoma disappear with early aggressive treatment, and although radiation is very effective at treating lymphoma, it has not been clear if it is needed in these patients that have an early rapid response to systemic therapy before starting radiation,” Dr. Speers explained.

“We have struggled as oncologists to know whether omitting this effective radiotherapy would compromise outcomes, and thus many were inclined to continue offering it to patients, even with the great early response. This study helps answer this critical question,” he said.

The results add reassuring evidence, buttressing efforts to avoid unnecessary interventions that may provide little or no benefit, Dr. Speers added.

“We are now in an era of ‘less being more’ as we seek ways to provide optimal quality and quantity of life to patients with cancer and their families, and this is just another example of the tremendous progress being made.”

Further commenting on the study at the press briefing, Julie R. Gralow, MD, ASCO chief medical officer and executive vice president, said the research supports ASCO’s ongoing efforts to reduce the toxicities of cancer treatment.

“Our ASCO vision is a world where cancer is either prevented or cured, and every patient is cured – and every survivor is healthy, and that part about every survivor being healthy is what we’re working on here [in this study],” Dr. Gralow said.

The study was funded by the Swiss Cancer League and Cancer Research UK, with partial support from the Swiss National Science Foundation. Dr. Zucca reported relationships with AstraZeneca, Beigene, Celgene, Incyte, Janssen, Merck, Roche, Celltrion Healthcare, Kite, and Abbvie. Dr. Speers disclosed his coinvention of technology that assesses radiosensitivity and predicts benefits from adjutant radiotherapy.

While cutting-edge treatments such as CAR T-cell therapies, clinical trials, and costly transplants for chronic lymphocytic leukemia (CLL) are not accessible to all 200,000+ people living with the disease nationwide, newly published data indicate that widely available medications for this most common of adult leukemias have steadily improved overall survival rates over most of the past 3 decades.

“The clinical take-away from our study is that population-based statistics show a decline in mortality and an increase in survival that is concurrent with the introduction of new therapies for treating CLL,” said lead study author Nadia Howlader, PhD, of the Surveillance Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Md. This research was published in Cancer Epidemiology, Biomarkers & Prevention.

National Cancer Institute, Bethesda, Md.

From 1992 to 2011, CLL mortality decreased 1.1% annually, then the pace of the decline hastened to 3.6% per year from 2011 to 2021 among adults aged ≥ 20 years. Furthermore, 5-year survival rates among patients with CLL increased 0.7% per year on average from 1992 to 2016. To account for yearly random fluctuations in the number of cases detected, incidence data was fit to a model to determine the trend.

Although the study was not designed to specify which treatments were disseminated among patients or to estimate the impact of a specific drug, there were only six new drugs approved for CLL from 1991 to 2010. In contrast, between 2011 and 2018, 11 new CLL drugs (in particular the approval of new tyrosine kinase inhibitors (TKIs)) ushered in a period of more rapid annual decreases in mortality.

“The approval of ibrutinib [2014] was a sea change in decreasing CLL mortality. Earlier therapies like chemoimmunotherapies were not as effective in patients with TP53 mutation and/or 17P deletions,” said Binsah George, MD, of McGovern Medical School at UTHealth, Houston, who was not associated with the study.

New TKIs not only decrease mortality, but also have fewer side effects than earlier cytotoxic therapies, do not require inpatient treatment, and are available to all patients on Medicare and Medicaid.

Although patients with relapsed CLL may benefit from bone marrow transplants or CAR T-cell therapy, these treatments are not available at many community oncology practices. Furthermore, some patients are too sick to receive them or don’t have the economic and social resources to get them.

Even though TKIs increase overall survival in patients with CLL, they are not curative and require lifelong treatment. 

“The estimated cost for CLL treatment is around $600,000 in a lifetime per patient, possibly placing significant burden on patients and the health care system,” said Dr. George.

“Certain trials are looking at stopping TKI treatment after a fixed period of time. This will let us learn more about the disease and could possibly lead to a decrease in cost and side effects of therapy,” concluded Dr. George.

Due to the study’s retrospective nature and data being sourced from state cancer registries and federal statistics, authors posited that rates of CLL could be underestimated, due to miscoding and missing information, particularly from those who get treatment outside of hospital settings. Additionally, some of the improvement in mortality could be attributed to better supportive care and less toxicity in medications, rather than then efficacy of novel agents.

Dr. Howlader and Dr. Binsah reported no conflicts of interest.

While cutting-edge treatments such as CAR T-cell therapies, clinical trials, and costly transplants for chronic lymphocytic leukemia (CLL) are not accessible to all 200,000+ people living with the disease nationwide, newly published data indicate that widely available medications for this most common of adult leukemias have steadily improved overall survival rates over most of the past 3 decades.

“The clinical take-away from our study is that population-based statistics show a decline in mortality and an increase in survival that is concurrent with the introduction of new therapies for treating CLL,” said lead study author Nadia Howlader, PhD, of the Surveillance Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Md. This research was published in Cancer Epidemiology, Biomarkers & Prevention.

National Cancer Institute, Bethesda, Md.

From 1992 to 2011, CLL mortality decreased 1.1% annually, then the pace of the decline hastened to 3.6% per year from 2011 to 2021 among adults aged ≥ 20 years. Furthermore, 5-year survival rates among patients with CLL increased 0.7% per year on average from 1992 to 2016. To account for yearly random fluctuations in the number of cases detected, incidence data was fit to a model to determine the trend.

Although the study was not designed to specify which treatments were disseminated among patients or to estimate the impact of a specific drug, there were only six new drugs approved for CLL from 1991 to 2010. In contrast, between 2011 and 2018, 11 new CLL drugs (in particular the approval of new tyrosine kinase inhibitors (TKIs)) ushered in a period of more rapid annual decreases in mortality.

“The approval of ibrutinib [2014] was a sea change in decreasing CLL mortality. Earlier therapies like chemoimmunotherapies were not as effective in patients with TP53 mutation and/or 17P deletions,” said Binsah George, MD, of McGovern Medical School at UTHealth, Houston, who was not associated with the study.

New TKIs not only decrease mortality, but also have fewer side effects than earlier cytotoxic therapies, do not require inpatient treatment, and are available to all patients on Medicare and Medicaid.

Although patients with relapsed CLL may benefit from bone marrow transplants or CAR T-cell therapy, these treatments are not available at many community oncology practices. Furthermore, some patients are too sick to receive them or don’t have the economic and social resources to get them.

Even though TKIs increase overall survival in patients with CLL, they are not curative and require lifelong treatment. 

“The estimated cost for CLL treatment is around $600,000 in a lifetime per patient, possibly placing significant burden on patients and the health care system,” said Dr. George.

“Certain trials are looking at stopping TKI treatment after a fixed period of time. This will let us learn more about the disease and could possibly lead to a decrease in cost and side effects of therapy,” concluded Dr. George.

Due to the study’s retrospective nature and data being sourced from state cancer registries and federal statistics, authors posited that rates of CLL could be underestimated, due to miscoding and missing information, particularly from those who get treatment outside of hospital settings. Additionally, some of the improvement in mortality could be attributed to better supportive care and less toxicity in medications, rather than then efficacy of novel agents.

Dr. Howlader and Dr. Binsah reported no conflicts of interest.

While cutting-edge treatments such as CAR T-cell therapies, clinical trials, and costly transplants for chronic lymphocytic leukemia (CLL) are not accessible to all 200,000+ people living with the disease nationwide, newly published data indicate that widely available medications for this most common of adult leukemias have steadily improved overall survival rates over most of the past 3 decades.

“The clinical take-away from our study is that population-based statistics show a decline in mortality and an increase in survival that is concurrent with the introduction of new therapies for treating CLL,” said lead study author Nadia Howlader, PhD, of the Surveillance Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, Md. This research was published in Cancer Epidemiology, Biomarkers & Prevention.

National Cancer Institute, Bethesda, Md.

From 1992 to 2011, CLL mortality decreased 1.1% annually, then the pace of the decline hastened to 3.6% per year from 2011 to 2021 among adults aged ≥ 20 years. Furthermore, 5-year survival rates among patients with CLL increased 0.7% per year on average from 1992 to 2016. To account for yearly random fluctuations in the number of cases detected, incidence data was fit to a model to determine the trend.

Although the study was not designed to specify which treatments were disseminated among patients or to estimate the impact of a specific drug, there were only six new drugs approved for CLL from 1991 to 2010. In contrast, between 2011 and 2018, 11 new CLL drugs (in particular the approval of new tyrosine kinase inhibitors (TKIs)) ushered in a period of more rapid annual decreases in mortality.

“The approval of ibrutinib [2014] was a sea change in decreasing CLL mortality. Earlier therapies like chemoimmunotherapies were not as effective in patients with TP53 mutation and/or 17P deletions,” said Binsah George, MD, of McGovern Medical School at UTHealth, Houston, who was not associated with the study.

New TKIs not only decrease mortality, but also have fewer side effects than earlier cytotoxic therapies, do not require inpatient treatment, and are available to all patients on Medicare and Medicaid.

Although patients with relapsed CLL may benefit from bone marrow transplants or CAR T-cell therapy, these treatments are not available at many community oncology practices. Furthermore, some patients are too sick to receive them or don’t have the economic and social resources to get them.

Even though TKIs increase overall survival in patients with CLL, they are not curative and require lifelong treatment. 

“The estimated cost for CLL treatment is around $600,000 in a lifetime per patient, possibly placing significant burden on patients and the health care system,” said Dr. George.

“Certain trials are looking at stopping TKI treatment after a fixed period of time. This will let us learn more about the disease and could possibly lead to a decrease in cost and side effects of therapy,” concluded Dr. George.

Due to the study’s retrospective nature and data being sourced from state cancer registries and federal statistics, authors posited that rates of CLL could be underestimated, due to miscoding and missing information, particularly from those who get treatment outside of hospital settings. Additionally, some of the improvement in mortality could be attributed to better supportive care and less toxicity in medications, rather than then efficacy of novel agents.

Dr. Howlader and Dr. Binsah reported no conflicts of interest.

Novel therapies have transformed the management of chronic lymphocytic leukemia (CLL) over the past decade. With the advent of new options, the optimal therapy for newly diagnosed patients has become less clear. Bruton tyrosine kinase (BTK) inhibitors have led to improvement in outcomes for most patients with CLL compared with chemoimmunotherapy (CIT).^1,2 Second-generation BTK inhibitors, such as acalabrutinib and zanubrutinib, are also available and appear to have an improved safety profile compared with ibrutinib. Similarly, the B-cell lymphoma 2 (BCL2) inhibitor venetoclax, in combination with obinutuzumab, is an effective option in first-line treatment that offers a time-limited approach.³ Studies combining BTK and BCL2 inhibitors are also promising in this setting.

Recently, the phase 3 GAIA-CLL13 study aimed to address the question of optimal time-limited first-line treatment for fit patients with CLL. Of note, patients with TP53 aberrations were excluded. Patients were randomly assigned to one of four treatment arms: CIT (fludarabine-cyclophosphamide-rituximab or bendamustine-rituximab), venetoclax-obinutuzumab, venetoclax-rituximab, or venetoclax-obinutuzumab-ibrutinub.

At 15 months, the rate of undetectable minimal residual disease (uMRD) was higher in the venetoclax-obinutuzumab group (86.5%; 97.5% CI 80.6-91.1) and the venetoclax-obinutuzumab-ibrutinib group (92.2%; 97.5% CI 87.3-95.7) compared with the CIT group (52.0%; 97.5% CI 44.4-59.5; P < .001 for both comparisons). The rate of uMRD for the venetoclax-rituximab group, however, was not higher than the rate in the CIT group (57.0%; 97.5%, CI 49.5-64.2; P = .32). The 3-year progression-free survival (PFS) was 90.5% in the venetoclax-obinutuzumab-ibrutinib group and 75.5% in the CIT group (hazard ratio [HR] for disease progression or death 0.32; 97.5% CI 0.19-0.54; P < .001). PFS at 3 years was also higher in the venetoclax-obinutuzumab group (87.7%; HR for disease progression or death, 0.42; 97.5% CI 0.26-0.68; P < .001), but not with venetoclax-rituximab group (80.8%; HR 0.79; 97.5% CI 0.53-1.18; P = .18). Grade 3 and grade 4 infections were more common with CIT (18.5%) and venetoclax-obinutuzumab-ibrutinib (21.2%) than with venetoclax-rituximab (10.5%) or venetoclax-obinutuzumab (13.2%).

This study confirms the role of fixed-duration venetoclax-based therapy for younger, fit patients with CLL. Interestingly, this study also suggests that rates of uMRD and PFS are superior with the use of obinutuzumab rather than with rituximab. Also of note, though the uMRD and PFS were highest with the triplet combination, it was not clearly superior to venetoclax-obinutuzumab alone and was associated with greater rates of toxicity.

Another ongoing randomized trial in first-line treatment of CLL is the FLAIR trial. This study was initially designed to compare ibrutinib-rituximab with standard CIT, though it was later modified to include an arm of ibrutinib alone and ibrutinib-venetoclax. Recently, the results of the first formal interim analysis comparing fludarabine, cyclophosphamide, and rituximab (n = 385) to ibrutinib-rituximb (n = 386), were published. This study, like the ECOG1912 study², demonstrated improved outcomes with a BTK inhibitor over standard CIT in fit patients with CLL. After a median follow-up of 53 months, the median PFS was not reached in patients receiving ibrutinib-rituximab and was 67 months (95% CI 63 to not reached) in those receiving fludarabine, cyclophosphamide, and rituximab (HR 0.44; P < .0001). A substantial number of sudden cardiac or unexplained deaths occurred, which were more frequent in the ibrutinib-rituximab group.

Though questions regarding optimal treatment remain, there are now multiple studies to suggest an advantage of novel agents over traditional CIT. Furthermore, regardless of approach, outcomes appear favorable for patients with CLL, even among higher-risk patients.

Other studies are also evaluating alternative ways to sequence therapy. A recent phase 2 study, for example, evaluated venetoclax consolidation for patients on ibrutinib. Forty-five patients with CLL and detectable disease (≥ 0.01% minimal residual disease in bone marrow [BM]) after treatment with ibrutinib for 12 or more months who had one or more high-risk feature for disease progression were included. Patients received combined treatment with ibrutinib (previously tolerated dose) and venetoclax (escalated to 400 mg once daily) for 24 or less cycles. Venetoclax was continued until patients achieved uMRD. Patients with uMRD also had the option of discontinuing ibrutinib. Adding venetoclax to ibrutinib led to a cumulative BM uMRD rate of 73%. BM uMRD was achieved by 71% of patients after venetoclax therapy completion and by 38% and 57% of patients after 6 and 12 cycles, respectively. This trial highlights the potential use of MRD to guide treatment as well as consolidation strategies to allow for time-limited treatment.

Additional References

1. Woyach JA, Ruppert AS, Heerema NA, et al. Ibrutinib regimens versus chemoimmunotherapy in older patients with untreated CLL. N Engl J Med. 2018;379:2517-2528. doi: 10.1056/NEJMoa1812836
2. Shanafelt TD, Wang XV, Kay NE, et al. Ibrutinib-rituximab or chemoimmunotherapy for chronic lymphocytic leukemia. N Engl J Med. 2019;381:432-443. doi: 10.1056/NEJMoa1817073
3. Fischer K, Al-Sawaf O, Bahlo J, et al. Venetoclax and obinutuzumab in patients with CLL and coexisting conditions. N Engl J Med. 2019;380:2225-2236. doi: 10.1056/NEJMoa1815281

Novel therapies have transformed the management of chronic lymphocytic leukemia (CLL) over the past decade. With the advent of new options, the optimal therapy for newly diagnosed patients has become less clear. Bruton tyrosine kinase (BTK) inhibitors have led to improvement in outcomes for most patients with CLL compared with chemoimmunotherapy (CIT).^1,2 Second-generation BTK inhibitors, such as acalabrutinib and zanubrutinib, are also available and appear to have an improved safety profile compared with ibrutinib. Similarly, the B-cell lymphoma 2 (BCL2) inhibitor venetoclax, in combination with obinutuzumab, is an effective option in first-line treatment that offers a time-limited approach.³ Studies combining BTK and BCL2 inhibitors are also promising in this setting.

Recently, the phase 3 GAIA-CLL13 study aimed to address the question of optimal time-limited first-line treatment for fit patients with CLL. Of note, patients with TP53 aberrations were excluded. Patients were randomly assigned to one of four treatment arms: CIT (fludarabine-cyclophosphamide-rituximab or bendamustine-rituximab), venetoclax-obinutuzumab, venetoclax-rituximab, or venetoclax-obinutuzumab-ibrutinub.

At 15 months, the rate of undetectable minimal residual disease (uMRD) was higher in the venetoclax-obinutuzumab group (86.5%; 97.5% CI 80.6-91.1) and the venetoclax-obinutuzumab-ibrutinib group (92.2%; 97.5% CI 87.3-95.7) compared with the CIT group (52.0%; 97.5% CI 44.4-59.5; P < .001 for both comparisons). The rate of uMRD for the venetoclax-rituximab group, however, was not higher than the rate in the CIT group (57.0%; 97.5%, CI 49.5-64.2; P = .32). The 3-year progression-free survival (PFS) was 90.5% in the venetoclax-obinutuzumab-ibrutinib group and 75.5% in the CIT group (hazard ratio [HR] for disease progression or death 0.32; 97.5% CI 0.19-0.54; P < .001). PFS at 3 years was also higher in the venetoclax-obinutuzumab group (87.7%; HR for disease progression or death, 0.42; 97.5% CI 0.26-0.68; P < .001), but not with venetoclax-rituximab group (80.8%; HR 0.79; 97.5% CI 0.53-1.18; P = .18). Grade 3 and grade 4 infections were more common with CIT (18.5%) and venetoclax-obinutuzumab-ibrutinib (21.2%) than with venetoclax-rituximab (10.5%) or venetoclax-obinutuzumab (13.2%).

This study confirms the role of fixed-duration venetoclax-based therapy for younger, fit patients with CLL. Interestingly, this study also suggests that rates of uMRD and PFS are superior with the use of obinutuzumab rather than with rituximab. Also of note, though the uMRD and PFS were highest with the triplet combination, it was not clearly superior to venetoclax-obinutuzumab alone and was associated with greater rates of toxicity.

Another ongoing randomized trial in first-line treatment of CLL is the FLAIR trial. This study was initially designed to compare ibrutinib-rituximab with standard CIT, though it was later modified to include an arm of ibrutinib alone and ibrutinib-venetoclax. Recently, the results of the first formal interim analysis comparing fludarabine, cyclophosphamide, and rituximab (n = 385) to ibrutinib-rituximb (n = 386), were published. This study, like the ECOG1912 study², demonstrated improved outcomes with a BTK inhibitor over standard CIT in fit patients with CLL. After a median follow-up of 53 months, the median PFS was not reached in patients receiving ibrutinib-rituximab and was 67 months (95% CI 63 to not reached) in those receiving fludarabine, cyclophosphamide, and rituximab (HR 0.44; P < .0001). A substantial number of sudden cardiac or unexplained deaths occurred, which were more frequent in the ibrutinib-rituximab group.

Though questions regarding optimal treatment remain, there are now multiple studies to suggest an advantage of novel agents over traditional CIT. Furthermore, regardless of approach, outcomes appear favorable for patients with CLL, even among higher-risk patients.

Other studies are also evaluating alternative ways to sequence therapy. A recent phase 2 study, for example, evaluated venetoclax consolidation for patients on ibrutinib. Forty-five patients with CLL and detectable disease (≥ 0.01% minimal residual disease in bone marrow [BM]) after treatment with ibrutinib for 12 or more months who had one or more high-risk feature for disease progression were included. Patients received combined treatment with ibrutinib (previously tolerated dose) and venetoclax (escalated to 400 mg once daily) for 24 or less cycles. Venetoclax was continued until patients achieved uMRD. Patients with uMRD also had the option of discontinuing ibrutinib. Adding venetoclax to ibrutinib led to a cumulative BM uMRD rate of 73%. BM uMRD was achieved by 71% of patients after venetoclax therapy completion and by 38% and 57% of patients after 6 and 12 cycles, respectively. This trial highlights the potential use of MRD to guide treatment as well as consolidation strategies to allow for time-limited treatment.

Additional References

1. Woyach JA, Ruppert AS, Heerema NA, et al. Ibrutinib regimens versus chemoimmunotherapy in older patients with untreated CLL. N Engl J Med. 2018;379:2517-2528. doi: 10.1056/NEJMoa1812836
2. Shanafelt TD, Wang XV, Kay NE, et al. Ibrutinib-rituximab or chemoimmunotherapy for chronic lymphocytic leukemia. N Engl J Med. 2019;381:432-443. doi: 10.1056/NEJMoa1817073
3. Fischer K, Al-Sawaf O, Bahlo J, et al. Venetoclax and obinutuzumab in patients with CLL and coexisting conditions. N Engl J Med. 2019;380:2225-2236. doi: 10.1056/NEJMoa1815281

Novel therapies have transformed the management of chronic lymphocytic leukemia (CLL) over the past decade. With the advent of new options, the optimal therapy for newly diagnosed patients has become less clear. Bruton tyrosine kinase (BTK) inhibitors have led to improvement in outcomes for most patients with CLL compared with chemoimmunotherapy (CIT).^1,2 Second-generation BTK inhibitors, such as acalabrutinib and zanubrutinib, are also available and appear to have an improved safety profile compared with ibrutinib. Similarly, the B-cell lymphoma 2 (BCL2) inhibitor venetoclax, in combination with obinutuzumab, is an effective option in first-line treatment that offers a time-limited approach.³ Studies combining BTK and BCL2 inhibitors are also promising in this setting.

Recently, the phase 3 GAIA-CLL13 study aimed to address the question of optimal time-limited first-line treatment for fit patients with CLL. Of note, patients with TP53 aberrations were excluded. Patients were randomly assigned to one of four treatment arms: CIT (fludarabine-cyclophosphamide-rituximab or bendamustine-rituximab), venetoclax-obinutuzumab, venetoclax-rituximab, or venetoclax-obinutuzumab-ibrutinub.

At 15 months, the rate of undetectable minimal residual disease (uMRD) was higher in the venetoclax-obinutuzumab group (86.5%; 97.5% CI 80.6-91.1) and the venetoclax-obinutuzumab-ibrutinib group (92.2%; 97.5% CI 87.3-95.7) compared with the CIT group (52.0%; 97.5% CI 44.4-59.5; P < .001 for both comparisons). The rate of uMRD for the venetoclax-rituximab group, however, was not higher than the rate in the CIT group (57.0%; 97.5%, CI 49.5-64.2; P = .32). The 3-year progression-free survival (PFS) was 90.5% in the venetoclax-obinutuzumab-ibrutinib group and 75.5% in the CIT group (hazard ratio [HR] for disease progression or death 0.32; 97.5% CI 0.19-0.54; P < .001). PFS at 3 years was also higher in the venetoclax-obinutuzumab group (87.7%; HR for disease progression or death, 0.42; 97.5% CI 0.26-0.68; P < .001), but not with venetoclax-rituximab group (80.8%; HR 0.79; 97.5% CI 0.53-1.18; P = .18). Grade 3 and grade 4 infections were more common with CIT (18.5%) and venetoclax-obinutuzumab-ibrutinib (21.2%) than with venetoclax-rituximab (10.5%) or venetoclax-obinutuzumab (13.2%).

This study confirms the role of fixed-duration venetoclax-based therapy for younger, fit patients with CLL. Interestingly, this study also suggests that rates of uMRD and PFS are superior with the use of obinutuzumab rather than with rituximab. Also of note, though the uMRD and PFS were highest with the triplet combination, it was not clearly superior to venetoclax-obinutuzumab alone and was associated with greater rates of toxicity.

Another ongoing randomized trial in first-line treatment of CLL is the FLAIR trial. This study was initially designed to compare ibrutinib-rituximab with standard CIT, though it was later modified to include an arm of ibrutinib alone and ibrutinib-venetoclax. Recently, the results of the first formal interim analysis comparing fludarabine, cyclophosphamide, and rituximab (n = 385) to ibrutinib-rituximb (n = 386), were published. This study, like the ECOG1912 study², demonstrated improved outcomes with a BTK inhibitor over standard CIT in fit patients with CLL. After a median follow-up of 53 months, the median PFS was not reached in patients receiving ibrutinib-rituximab and was 67 months (95% CI 63 to not reached) in those receiving fludarabine, cyclophosphamide, and rituximab (HR 0.44; P < .0001). A substantial number of sudden cardiac or unexplained deaths occurred, which were more frequent in the ibrutinib-rituximab group.

Though questions regarding optimal treatment remain, there are now multiple studies to suggest an advantage of novel agents over traditional CIT. Furthermore, regardless of approach, outcomes appear favorable for patients with CLL, even among higher-risk patients.

Other studies are also evaluating alternative ways to sequence therapy. A recent phase 2 study, for example, evaluated venetoclax consolidation for patients on ibrutinib. Forty-five patients with CLL and detectable disease (≥ 0.01% minimal residual disease in bone marrow [BM]) after treatment with ibrutinib for 12 or more months who had one or more high-risk feature for disease progression were included. Patients received combined treatment with ibrutinib (previously tolerated dose) and venetoclax (escalated to 400 mg once daily) for 24 or less cycles. Venetoclax was continued until patients achieved uMRD. Patients with uMRD also had the option of discontinuing ibrutinib. Adding venetoclax to ibrutinib led to a cumulative BM uMRD rate of 73%. BM uMRD was achieved by 71% of patients after venetoclax therapy completion and by 38% and 57% of patients after 6 and 12 cycles, respectively. This trial highlights the potential use of MRD to guide treatment as well as consolidation strategies to allow for time-limited treatment.

Additional References

1. Woyach JA, Ruppert AS, Heerema NA, et al. Ibrutinib regimens versus chemoimmunotherapy in older patients with untreated CLL. N Engl J Med. 2018;379:2517-2528. doi: 10.1056/NEJMoa1812836
2. Shanafelt TD, Wang XV, Kay NE, et al. Ibrutinib-rituximab or chemoimmunotherapy for chronic lymphocytic leukemia. N Engl J Med. 2019;381:432-443. doi: 10.1056/NEJMoa1817073
3. Fischer K, Al-Sawaf O, Bahlo J, et al. Venetoclax and obinutuzumab in patients with CLL and coexisting conditions. N Engl J Med. 2019;380:2225-2236. doi: 10.1056/NEJMoa1815281