On March 27, 2021, the U.S. Food and Drug Administration (FDA) approved idecabtagene vicleucel (Abecma), for the treatment of adult patients with relapsed or refractory multiple myeloma after four or more prior lines of therapy, including an immunomodulatory agent, a proteasome inhibitor, and an anti-CD38 monoclonal antibody. This is the first FDA-approved cell-based gene therapy for multiple myeloma.