Abstract
Persons with diffuse large B cell lymphoma (DLBCL) refractory or in first progression/relapsed (R/R) after chimeric antigen receptor T (CAR-T) cell therapy exhibit dramatic outcomes. We enrolled such persons in a phase 2 single-arm, nonblinded trial ( NCT04703686 ) to evaluate the efficacy and safety of glofitamab, a CD20-CD3 T cell-engaging bispecific antibody, using a short ramp-up regimen to reach full dose within 1 week. A total of 46 participants received at least one glofitamab infusion following obinutuzumab (anti-CD20 monoclonal antibody) pretreatment. The primary endpoint was overall survival (OS). Secondary endpoints included independent-assessed best overall metabolic response rate (OMRR) and complete metabolic response rate (CMRR), progression-free survival (PFS), duration of response, safety and tolerability and health-related quality of life. After a median follow-up of 15.3 months (95% confidence interval (CI), 10.1-17.7), the primary endpoint was met, achieving a median OS of 14.7 months (90% CI, 8.8-not reached). The best OMRR was 76.1%. The best CMRR was 45.7%. The median PFS was 3.8 months (95% CI, 2.4-19.6). Despite the shortened setup dosing, no excess cytokine release syndrome or neurotoxicity events were observed (grade ≥ 3, 0% for both). In conclusion, glofitamab improved OS in participants with R/R DLBCL after CAR-T cell therapy, with a favorable safety profile.