RecruitingPhase 3Drug trialA Study Comparing QLS32015 Monotherapy Versus Pomalidomide, Dexamethasone (Pd) or Selinexor, Dexamethasone (Sd) in Participants With Relapsed or Refractory Multiple MyelomaThe purpose of this study is to compare the safety and efficacy of QLS32015 with Pd/Sd for the treatment of relapsed or refractory multiple myeloma.