Real-World Experience with Teclistamab for Relapsed/ Refractory Multiple Myeloma from the U.S. Myeloma Immunotherapy Consortium.

Teclistamab is an anti-CD3xBCMA bispecific antibody approved for use in relapsed/refractory multiple myeloma (MM). We undertook a retrospective study of post-approval, real-world outcomes with teclistamab in the U.S. MM Immunotherapy Consortium. Among 509 patients, 89% would have been ineligible for the MajesTEC-1 trial, primarily due to prior BCMA-directed therapy, cytopenias, or diminished performance status. Cytokine release syndrome occurred in 54% (1.4% grade ≥3) and immune effector cell-associated neurotoxicity syndrome in 11% (2.2% grade ≥3) with no fatal events. Infections occurred in 42% and contributed to death in 5%. Partial response (PR) or better was achieved in 53% and very good PR (VGPR) or better in 45%. With 10.1 months median follow-up, estimated median progression-free survival (PFS) was 5.8 months, and 12-month overall survival was 61%. Independent predictors of