The MajesTEC-1 trial, a phase 1/2 open-label research that revealed effectiveness data from 110 patients with relapsed or refractory multiple myeloma, provided evidence from strong response rates that served as the foundation for the approval. The accelerated approval of a bispecific antibody for the incurable blood malignancy is a first of its kind in the US. Proteasome inhibitor, immunomodulatory drug, and anti-CD38 monoclonal antibody must have been used in prior therapy.