Cevostamab (BFCR4350A; RG6160; RO7187797) is a humanized IgG1-based BsAb that targets membrane-proximal extracellular domain of FcRH5 on multiple myeloma (MM) cells as well as CD3 on T cells. Moreover, Cevostamab facilitates efficient synapse formation, improves killing activity of T cells against MM tumor cells.