Real-world outcomes of brexucabtagene autoleucel for relapsed or refractory mantle cell lymphoma: a CIBMTR analysis.

Brexucabtagene autoleucel (brexu-cel) is a chimeric antigen receptor T-cell therapy approved for relapsed/refractory mantle cell lymphoma (r/r MCL). Here, we report real-world effectiveness and safety outcomes of brexu-cel in a prospective study of patients with r/r MCL, including subgroups based on prior treatment with Bruton's tyrosine kinase inhibitor, bendamustine, or autologous hematopoietic cell transplant (auto-HCT) and number of prior therapy lines, using Center for International Blood and Marrow Transplant Research registry data. A total of 476 patients with r/r MCL who received brexu-cel between July 2020 and December 2022 were included in the analysis. With a median follow-up of 13.5 months, the overall response rate was 91% and complete response rate was 82%. One-year overall survival and progression-free survival rates were 76% and 63%, respectively. One-year cumulative incidence of non-relapse mortality was 8%. Prior auto-HCT was associated with better duration of response within 6 months after infusion (hazard ratio [HR] 0.49; 95% confidence interval [CI], 0.28-0.85) but greater risk of immune effector cell-associated neurotoxicity syndrome (odds ratio [OR] 1.66; 95% CI, 1.06-2.60). Prior bendamustine was associated with increased risk of prolonged thrombocytopenia (OR 1.90; 95% CI, 1.13-3.21). In patients with 1-2 prior therapy lines, relapse or progression was less frequent compared with those with 3 or more prior lines (HR 0.64; 95% CI, 0.42-1.00). Collectively, our results suggest that real-world outcomes with brexu-cel were consistent with ZUMA-2, regardless of prior therapy type or number of prior therapy lines.