Commentary: Recent Practice-Changing Studies in LBCL and MCL, November 2023

The ZUMA-7 and TRANSFORM studies have been practice-changing for the treatment of relapsed/refractory (R/R) large B-cell lymphoma (LBCL). These studies demonstrated an improvement in outcomes with axicabtagene ciloleucel (axi-cel) and lisocabtagene maraleucel (liso-cel), respectively, as compared with standard-of-care treatment (chemotherapy and autologous stem cell transplantation).^1,2 Patients included in these studies were refractory to their initial therapy or experienced relapse within 12 months and were considered fit for autologous stem cell transplant. It has remained unclear, however, whether patients who are not transplant candidates may also derive benefit and tolerate treatment with chimeric antigen receptor (CAR) T-cell therapy. The PILOT study was a single-arm phase 2 study that demonstrated favorable outcomes with liso-cel in this patient population, thus resulting in the approval of liso-cel by the US Food and Drug Administration for this population.³ Recently, the ALYCATE study similarly examined outcomes in transplant-ineligible patients treated with axi-cel (Houot et al). This phase 2 study included 62 patients with high-risk R/R LBCL who underwent leukapheresis and subsequently received second-line axi-cel. The complete metabolic response rate 3 months after axi-cel infusion was 71.0% (95% CI 58.1%-81.8%). At a median 12-month follow-up, the median progression-free survival was 11.8 months (95% CI 8.4-not reached) whereas median overall survival was not reached. Grade ≥ 3 cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome (ICANS) occurred in 8.1% and 14.5% of patients, respectively. Also of note, patients age ≥ 70 years did not show increased toxicity compared with those age < 70 years, with similar rates of CRS, ICANS, and intensive care unit transfer. This study supports the role of axi-cel in the second-line setting, regardless of transplant eligibility.

Another important study recently published for patients with LBCL examined the role of central nervous system (CNS) prophylaxis (Lewis et al). We know that certain patients with LBCL, including those with a high CNS international prognostic index (IPI) score, double-hit lymphoma, or disease involvement of multiple or certain extranodal sites (ie, breast, testes, adrenals, kidney) can be at increased risk for lymphoma spread to the CNS.⁴ Strategies to reduce this risk have subsequently been developed for these high-risk patients, though consensus regarding who should be treated and how best to treat patients has been consistent. Recently, retrospective data have also called into question whether our current approaches meaningfully reduce this risk. One such study was a multicenter, international, retrospective observational study that included 2418 adults with aggressive LBCL and a high risk for CNS progression who were treated with curative-intent anti-CD20–based chemoimmunotherapy and who did or did not receive high-dose methotrexate (HD-MTX). Patients who did vs did not receive HD-MTX had a significantly lower risk for CNS progression (adjusted 5-year risk difference 1.6%; adjusted hazard ratio [aHR] 0.59; P = .014), but the significance was lost when considering only those patients who achieved a complete response at chemoimmunotherapy completion (adjusted 5-year risk difference 1.4%; aHR 0.74; P = .30). The study was not sufficiently powered to make definitive conclusions for individual risk groups, though there was no obvious reduction in CNS involvement risk in any high-risk subgroup. With an absolute risk reduction of 1.6% with the use of HD-MTX, 63 patients would require treatment to prevent one CNS progression event over 5 years (Lewis et al). Given the absence of prospective, randomized data, these results, though retrospective in nature, call into question the benefit of CNS prophylaxis. The authors suggest that studies evaluating alternative strategies for prophylaxis and tools for early detection of relapse, such as circulating tumor DNA, may be helpful.

Another study worth noting was one exploring Bruton tyrosine kinase (BTK) inhibition in mantle cell lymphoma (MCL). BTK inhibitors, including zanubrutinib, have emerged as effective therapies for patients with R/R disease. A recent pooled analysis included 112 patients from the BGB-3111-AU-003 and BGB-3111-206 clinical trials who had R/R MCL and received second-line (n = 41) or later-line (n = 71) zanubrutinib (Song et al). At a median follow-up of 35.2 months, patients receiving second-line vs later-line zanubrutinib had significantly improved median overall survival (aHR 0.459; P = .044) and numerically longer median progression-free survival (27.8 vs 22.1 months). Adverse events observed in both groups were consistent with the known safety profile of zanubrutinib. These findings were in line with a prior similar pooled study that demonstrated improved outcomes with second-line ibrutinib for patients with MCL as compared with later-line ibrutinib therapy.⁵ This study, however, did not evaluate the impact on CAR T–cell therapy in MCL, which is also an effective treatment option for patients with R/R disease, and how best to sequence with BTK inhibitors.

Additional References

1.       Locke FL, Miklos DB, Jacobson CA, et al, for All ZUMA-7 Investigators and Contributing Kite Members. Axicabtagene ciloleucel as second-line therapy for large B-cell lymphoma. N Engl J Med. 2022;386:640-654. doi: 10.1056/NEJMoa2116133

2.       Kamdar M, Solomon SR, Arnason J, et al, for theTRANSFORM Investigators. Lisocabtagene maraleucel versus standard of care with salvage chemotherapy followed by autologous stem cell transplantation as second-line treatment in patients with relapsed or refractory large B-cell lymphoma (TRANSFORM): Results from an interim analysis of an open-label, randomised, phase 3 trial. Lancet. 2022;399:2294-2308. doi: 10.1016/S0140-6736(22)00662-6

3.       Gordon LI, Liu FF, Braverman J, et al. Lisocabtagene maraleucel for second-line relapsed or refractory large B-cell lymphoma: Patient-reported outcomes from the PILOT study. Haematologica. 2023 (Aug 31). doi: 10.3324/haematol.2023.283162

4.       Schmitz N, Zeynalova S, Nickelsen M, et al. CNS International Prognostic Index: A risk model for CNS relapse in patients with diffuse large B-cell lymphoma treated with R-CHOP. J Clin Oncol. 2016;34:3150-3156. doi: 10.1200/JCO.2015.65.6520

5.       Dreyling M, Goy A, Hess G, et al. Long-term outcomes with ibrutinib treatment for patients with relapsed/refractory mantle cell lymphoma: A pooled analysis of 3 clinical trials with nearly 10 years of follow-up. Hemasphere. 2022;6:e712. doi: 10.1097/HS9.0000000000000712

The ZUMA-7 and TRANSFORM studies have been practice-changing for the treatment of relapsed/refractory (R/R) large B-cell lymphoma (LBCL). These studies demonstrated an improvement in outcomes with axicabtagene ciloleucel (axi-cel) and lisocabtagene maraleucel (liso-cel), respectively, as compared with standard-of-care treatment (chemotherapy and autologous stem cell transplantation).^1,2 Patients included in these studies were refractory to their initial therapy or experienced relapse within 12 months and were considered fit for autologous stem cell transplant. It has remained unclear, however, whether patients who are not transplant candidates may also derive benefit and tolerate treatment with chimeric antigen receptor (CAR) T-cell therapy. The PILOT study was a single-arm phase 2 study that demonstrated favorable outcomes with liso-cel in this patient population, thus resulting in the approval of liso-cel by the US Food and Drug Administration for this population.³ Recently, the ALYCATE study similarly examined outcomes in transplant-ineligible patients treated with axi-cel (Houot et al). This phase 2 study included 62 patients with high-risk R/R LBCL who underwent leukapheresis and subsequently received second-line axi-cel. The complete metabolic response rate 3 months after axi-cel infusion was 71.0% (95% CI 58.1%-81.8%). At a median 12-month follow-up, the median progression-free survival was 11.8 months (95% CI 8.4-not reached) whereas median overall survival was not reached. Grade ≥ 3 cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome (ICANS) occurred in 8.1% and 14.5% of patients, respectively. Also of note, patients age ≥ 70 years did not show increased toxicity compared with those age < 70 years, with similar rates of CRS, ICANS, and intensive care unit transfer. This study supports the role of axi-cel in the second-line setting, regardless of transplant eligibility.

Another important study recently published for patients with LBCL examined the role of central nervous system (CNS) prophylaxis (Lewis et al). We know that certain patients with LBCL, including those with a high CNS international prognostic index (IPI) score, double-hit lymphoma, or disease involvement of multiple or certain extranodal sites (ie, breast, testes, adrenals, kidney) can be at increased risk for lymphoma spread to the CNS.⁴ Strategies to reduce this risk have subsequently been developed for these high-risk patients, though consensus regarding who should be treated and how best to treat patients has been consistent. Recently, retrospective data have also called into question whether our current approaches meaningfully reduce this risk. One such study was a multicenter, international, retrospective observational study that included 2418 adults with aggressive LBCL and a high risk for CNS progression who were treated with curative-intent anti-CD20–based chemoimmunotherapy and who did or did not receive high-dose methotrexate (HD-MTX). Patients who did vs did not receive HD-MTX had a significantly lower risk for CNS progression (adjusted 5-year risk difference 1.6%; adjusted hazard ratio [aHR] 0.59; P = .014), but the significance was lost when considering only those patients who achieved a complete response at chemoimmunotherapy completion (adjusted 5-year risk difference 1.4%; aHR 0.74; P = .30). The study was not sufficiently powered to make definitive conclusions for individual risk groups, though there was no obvious reduction in CNS involvement risk in any high-risk subgroup. With an absolute risk reduction of 1.6% with the use of HD-MTX, 63 patients would require treatment to prevent one CNS progression event over 5 years (Lewis et al). Given the absence of prospective, randomized data, these results, though retrospective in nature, call into question the benefit of CNS prophylaxis. The authors suggest that studies evaluating alternative strategies for prophylaxis and tools for early detection of relapse, such as circulating tumor DNA, may be helpful.

Another study worth noting was one exploring Bruton tyrosine kinase (BTK) inhibition in mantle cell lymphoma (MCL). BTK inhibitors, including zanubrutinib, have emerged as effective therapies for patients with R/R disease. A recent pooled analysis included 112 patients from the BGB-3111-AU-003 and BGB-3111-206 clinical trials who had R/R MCL and received second-line (n = 41) or later-line (n = 71) zanubrutinib (Song et al). At a median follow-up of 35.2 months, patients receiving second-line vs later-line zanubrutinib had significantly improved median overall survival (aHR 0.459; P = .044) and numerically longer median progression-free survival (27.8 vs 22.1 months). Adverse events observed in both groups were consistent with the known safety profile of zanubrutinib. These findings were in line with a prior similar pooled study that demonstrated improved outcomes with second-line ibrutinib for patients with MCL as compared with later-line ibrutinib therapy.⁵ This study, however, did not evaluate the impact on CAR T–cell therapy in MCL, which is also an effective treatment option for patients with R/R disease, and how best to sequence with BTK inhibitors.

Additional References

1.       Locke FL, Miklos DB, Jacobson CA, et al, for All ZUMA-7 Investigators and Contributing Kite Members. Axicabtagene ciloleucel as second-line therapy for large B-cell lymphoma. N Engl J Med. 2022;386:640-654. doi: 10.1056/NEJMoa2116133

2.       Kamdar M, Solomon SR, Arnason J, et al, for theTRANSFORM Investigators. Lisocabtagene maraleucel versus standard of care with salvage chemotherapy followed by autologous stem cell transplantation as second-line treatment in patients with relapsed or refractory large B-cell lymphoma (TRANSFORM): Results from an interim analysis of an open-label, randomised, phase 3 trial. Lancet. 2022;399:2294-2308. doi: 10.1016/S0140-6736(22)00662-6

3.       Gordon LI, Liu FF, Braverman J, et al. Lisocabtagene maraleucel for second-line relapsed or refractory large B-cell lymphoma: Patient-reported outcomes from the PILOT study. Haematologica. 2023 (Aug 31). doi: 10.3324/haematol.2023.283162

4.       Schmitz N, Zeynalova S, Nickelsen M, et al. CNS International Prognostic Index: A risk model for CNS relapse in patients with diffuse large B-cell lymphoma treated with R-CHOP. J Clin Oncol. 2016;34:3150-3156. doi: 10.1200/JCO.2015.65.6520

5.       Dreyling M, Goy A, Hess G, et al. Long-term outcomes with ibrutinib treatment for patients with relapsed/refractory mantle cell lymphoma: A pooled analysis of 3 clinical trials with nearly 10 years of follow-up. Hemasphere. 2022;6:e712. doi: 10.1097/HS9.0000000000000712

The ZUMA-7 and TRANSFORM studies have been practice-changing for the treatment of relapsed/refractory (R/R) large B-cell lymphoma (LBCL). These studies demonstrated an improvement in outcomes with axicabtagene ciloleucel (axi-cel) and lisocabtagene maraleucel (liso-cel), respectively, as compared with standard-of-care treatment (chemotherapy and autologous stem cell transplantation).^1,2 Patients included in these studies were refractory to their initial therapy or experienced relapse within 12 months and were considered fit for autologous stem cell transplant. It has remained unclear, however, whether patients who are not transplant candidates may also derive benefit and tolerate treatment with chimeric antigen receptor (CAR) T-cell therapy. The PILOT study was a single-arm phase 2 study that demonstrated favorable outcomes with liso-cel in this patient population, thus resulting in the approval of liso-cel by the US Food and Drug Administration for this population.³ Recently, the ALYCATE study similarly examined outcomes in transplant-ineligible patients treated with axi-cel (Houot et al). This phase 2 study included 62 patients with high-risk R/R LBCL who underwent leukapheresis and subsequently received second-line axi-cel. The complete metabolic response rate 3 months after axi-cel infusion was 71.0% (95% CI 58.1%-81.8%). At a median 12-month follow-up, the median progression-free survival was 11.8 months (95% CI 8.4-not reached) whereas median overall survival was not reached. Grade ≥ 3 cytokine release syndrome (CRS) and immune effector cell-associated neurotoxicity syndrome (ICANS) occurred in 8.1% and 14.5% of patients, respectively. Also of note, patients age ≥ 70 years did not show increased toxicity compared with those age < 70 years, with similar rates of CRS, ICANS, and intensive care unit transfer. This study supports the role of axi-cel in the second-line setting, regardless of transplant eligibility.

Another important study recently published for patients with LBCL examined the role of central nervous system (CNS) prophylaxis (Lewis et al). We know that certain patients with LBCL, including those with a high CNS international prognostic index (IPI) score, double-hit lymphoma, or disease involvement of multiple or certain extranodal sites (ie, breast, testes, adrenals, kidney) can be at increased risk for lymphoma spread to the CNS.⁴ Strategies to reduce this risk have subsequently been developed for these high-risk patients, though consensus regarding who should be treated and how best to treat patients has been consistent. Recently, retrospective data have also called into question whether our current approaches meaningfully reduce this risk. One such study was a multicenter, international, retrospective observational study that included 2418 adults with aggressive LBCL and a high risk for CNS progression who were treated with curative-intent anti-CD20–based chemoimmunotherapy and who did or did not receive high-dose methotrexate (HD-MTX). Patients who did vs did not receive HD-MTX had a significantly lower risk for CNS progression (adjusted 5-year risk difference 1.6%; adjusted hazard ratio [aHR] 0.59; P = .014), but the significance was lost when considering only those patients who achieved a complete response at chemoimmunotherapy completion (adjusted 5-year risk difference 1.4%; aHR 0.74; P = .30). The study was not sufficiently powered to make definitive conclusions for individual risk groups, though there was no obvious reduction in CNS involvement risk in any high-risk subgroup. With an absolute risk reduction of 1.6% with the use of HD-MTX, 63 patients would require treatment to prevent one CNS progression event over 5 years (Lewis et al). Given the absence of prospective, randomized data, these results, though retrospective in nature, call into question the benefit of CNS prophylaxis. The authors suggest that studies evaluating alternative strategies for prophylaxis and tools for early detection of relapse, such as circulating tumor DNA, may be helpful.

Another study worth noting was one exploring Bruton tyrosine kinase (BTK) inhibition in mantle cell lymphoma (MCL). BTK inhibitors, including zanubrutinib, have emerged as effective therapies for patients with R/R disease. A recent pooled analysis included 112 patients from the BGB-3111-AU-003 and BGB-3111-206 clinical trials who had R/R MCL and received second-line (n = 41) or later-line (n = 71) zanubrutinib (Song et al). At a median follow-up of 35.2 months, patients receiving second-line vs later-line zanubrutinib had significantly improved median overall survival (aHR 0.459; P = .044) and numerically longer median progression-free survival (27.8 vs 22.1 months). Adverse events observed in both groups were consistent with the known safety profile of zanubrutinib. These findings were in line with a prior similar pooled study that demonstrated improved outcomes with second-line ibrutinib for patients with MCL as compared with later-line ibrutinib therapy.⁵ This study, however, did not evaluate the impact on CAR T–cell therapy in MCL, which is also an effective treatment option for patients with R/R disease, and how best to sequence with BTK inhibitors.

Additional References

1.       Locke FL, Miklos DB, Jacobson CA, et al, for All ZUMA-7 Investigators and Contributing Kite Members. Axicabtagene ciloleucel as second-line therapy for large B-cell lymphoma. N Engl J Med. 2022;386:640-654. doi: 10.1056/NEJMoa2116133

2.       Kamdar M, Solomon SR, Arnason J, et al, for theTRANSFORM Investigators. Lisocabtagene maraleucel versus standard of care with salvage chemotherapy followed by autologous stem cell transplantation as second-line treatment in patients with relapsed or refractory large B-cell lymphoma (TRANSFORM): Results from an interim analysis of an open-label, randomised, phase 3 trial. Lancet. 2022;399:2294-2308. doi: 10.1016/S0140-6736(22)00662-6

3.       Gordon LI, Liu FF, Braverman J, et al. Lisocabtagene maraleucel for second-line relapsed or refractory large B-cell lymphoma: Patient-reported outcomes from the PILOT study. Haematologica. 2023 (Aug 31). doi: 10.3324/haematol.2023.283162

4.       Schmitz N, Zeynalova S, Nickelsen M, et al. CNS International Prognostic Index: A risk model for CNS relapse in patients with diffuse large B-cell lymphoma treated with R-CHOP. J Clin Oncol. 2016;34:3150-3156. doi: 10.1200/JCO.2015.65.6520

5.       Dreyling M, Goy A, Hess G, et al. Long-term outcomes with ibrutinib treatment for patients with relapsed/refractory mantle cell lymphoma: A pooled analysis of 3 clinical trials with nearly 10 years of follow-up. Hemasphere. 2022;6:e712. doi: 10.1097/HS9.0000000000000712