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

Inclusion Criteria: * Documented diagnosis of MM based on standard International Myeloma Working Group (IMWG) criteria * Evidence of progressive disease based on investigators determination of response by IMWG criteria on or after their last dosing regimen * Current relapsed or refractory (R/R) disease status * Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 * Life expectancy of at least 12 weeks * Agreement to protocol-specified assessments, including bone marrow biopsy and aspirate samples as detailed in the protocol * Resolution of AEs from prior anti-cancer therapy to Grade =\< 1 or better * For female participants of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraception during the treatment period and for at least 5 months after the final dose of cevostamab and for 3 months after the last dose of tocilizumab was administered * For male participants: agreement to remain abstinent (refrain from heterosexual intercourse) or use a condom, and agree to refrain from donating sperm during the treatment period and for at least 2 months after the final dose of tocilizumab (if applicable) to avoid exposing the embryo Exclusion Criteria: * Unable to comply with protocol-mandated hospitalization * Pregnancy or breastfeeding, or intention of becoming pregnant during the study or within 5 months after the final dose of cevostamab or tocilizumab or within 3 months after the last dose of tocilizumab (…