A Study Evaluating the Safety, Pharmacokinetics, and Activity of Cevostamab in Participants With Relapsed or Refractory Multiple Myeloma

Inclusion Criteria: * Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 * Life expectancy of at least 12 weeks * Agreement to provide bone marrow biopsy and aspirate samples * Resolution of adverse events from prior anti-cancer therapy to Grade = 3 CRS or immune effector cell-associated neurotoxicity syndrome (ICANS) with prior bispecific therapies * Known history of hemophagocytic lymphohistiocytosis (HLH) or immune effector cell associated hemophagocytic lymphohistiocytosis like syndrome (IEC HS) * Active symptomatic coronavirus disease 2019 (COVID-19) infection at study enrollment or requiring treatment with intravenous (IV) antiviral where the last dose of IV antiviral treatment was given within 14 days prior to first study treatment. Patients with active COVID-19 infection must have clinical recovery and two negative antigen tests at least 24 hours apart prior to first study treatment * Positive and quantifiable EBV polymerase chain reaction (PCR) or Cytomegalovirus (CMV) PCR prior to…