This phase I trial is evaluating an intravenous drug (BFCR4350A) in patients with multiple myeloma, who have progressed or not responded to prior treatmentAn Open-Label, Multicenter, Phase I Trial Evaluating the Safety and Pharmacokinetics of Escalating Doses of BFCR4350A in Patients With Relapsed or Refractory Multiple Myeloma

Exclusion

• Inability to comply with protocol-mandated hospitalization and activities restrictions
• Pregnant or breastfeeding, or planning to become pregnant during the study or within 5 months after the last dose of cevostamab or within 3 months after the last dose of of tocilizumab (if applicable)
• Prior use of any monoclonal antibody, radioimmunoconjugate, or antibody-drug conjugate as anti-cancer therapy within 4 weeks before first infusion
• Prior treatment with systemic immunotherapeutic agents within 12 weeks or 5 half-lives of the drug, whichever is shorter, before first infusion
• Prior treatment with chimeric antigen receptor (CAR) T-cell therapy within 12 weeks before first cevostamab infusion
• Known treatment-related, immune-mediated adverse events associated with prior immunotherapeutic agents
• Treatment with radiotherapy, any chemotherapeutic agent, or treatment with any other anti-cancer agent (investigational or otherwise) within 4 weeks or 5 half-lives of the drug, whichever is shorter, prior to first cevostamab infusion
• Autologous stem cell transplantation (SCT) within 100 days prior to first infusion
• Prior allogeneic SCT or solid organ transplantation
• Absolute plasma cell count exceeding 500/micro L or 5% of the peripheral blood white cells
• History of autoimmune disease or of confirmed progressive multifocal leukoencephalopathy
• Known history of hemophagocytic lymphohistiocytosis (HLH) or macrophage activation syndrome (MAS)
• History of severe allergic or anaphylactic reactions to monoclonal antibody therapy (or recombinant antibody-related fusion proteins)
• Patients with known history of amyloidosis (e.g., positive Congo Red stain or equivalent in tissue biopsy)
• Patients with lesions in proximity of vital organs that may develop sudden decompensation/deterioration in the setting of a tumor flare
• History of other malignancy that could affect compliance with the protocol or interpretation of results
• Current or past history of central nervous system (CNS) disease, or CNS involvement by MM
• Significant cardiovascular disease that may limit a patient's ability to adequately respond to a CRS event
• Symptomatic active pulmonary disease requiring supplemental oxygen
• Within 14 days prior to first cevostamab infusion: known active bacterial, viral, fungal, mycobacterial, parasitic, or other infection (excluding fungal infections of nail beds) at study enrollment, or any major episode of infection requiring treatment with IV antibiotics within 4 weeks prior to first infusion
• Positive and quantifiable Epstein-Barr virus (EBV) polymerase chain reaction (PCR) or cytomegalovirus (CMV) PCR prior to first study treatment
• Known or suspected chronic active EBV infection, acute or chronic hepatitis C virus (HCV) infection
• Positive serologic or PCR test results for acute or chronic hepatitis B virus (HBV) infection
• Recent major surgery within 4 weeks prior to first infusion
• Human Immunodeficiency Virus (HIV) positive
• Any episode of active, symptomatic COVID-19 infection, or requiring treatment with IV antivirals for COVID-19 (not including COVID-19 primary prophylaxis) within 14 days, prior to first study treatment
• Administration of a live, attenuated vaccine within 4 weeks before first cevostamab infusion or anticipation that such a live attenuated vaccine will be required during the study
• Received systemic immunosuppressive medications (including, but not limited to, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor agents), with the exception of corticosteroid treatment <=10 mg/day prednisone or equivalent within 2 weeks prior to first dose of cevostamab and, if applicable, tocilizumab premedication prior to first dose of cevostamab
• History of illicit drug or alcohol abuse within 12 months prior to screening
• Any medical condition or laboratory test abnormality that precludes the participant's safe participation in and completion of the study, or which could affect compliance with the protocol or interpretation of results