RecruitingPhase 2Drug trialA Study Evaluating the Prophylactic Use of Tocilizumab to Prevent Cytokine Release Syndrome With Ramantamig Administration in Participants With Relapsed/Refractory Multiple MyelomaThe purpose of this study is to find out whether giving a single dose of tocilizumab before treatment with ramantamig can help prevent or reduce the severity of cytokine release syndrome (CRS) within 28 days from ramantamig, compared to participants who receive placebo. CRS is an acute inflammatory reaction that can occur during treatment and may be associated with flu-like or other systemic symptoms, such as fever and tiredness.