RecruitingPhase 3Drug trialA Study to Evaluate Glofitamab as a Single Agent vs. Investigator's Choice in Participants With Relapsed/Refractory Mantle Cell LymphomaThe purpose of this study is to evaluate the efficacy of glofitamab monotherapy compared with an investigator's choice of either rituximab plus bendamustine (BR), or lenalidomide with rituximab (R-Len) in patients with relapsed or refractory (R/R) mantle cell lymphoma (MCL).