This trial will evaluate the efficacy and safety of combination of pomalidomide (POM) and low-dose dexamethasone (LD-Dex) (Cohort A) or the combination of pomalidomide (POM) , daratumumab (DARA) and low-dose dexamethasone (LD-Dex) (Cohort B) in subjects with relapsed or refractory multiple myeloma who have received a first or second line treatment of lenalidomide-based therapy. This trial will test the hypothesis for Cohort A that the proportion of patients will have an Overall Response Rate (ORR) of \> 30 % to reveal that Pomalidomide is efficacious in pretreated patients who are refractory to lenalidomide. This trial will test the hypothesis for Cohort B that the proportion of patients will have an Overall Response Rate (ORR) of \> 70 % to reveal that POM+DARA+LD-Dex is efficacious in pretreated patients who are refractory to lenalidomide. This trial will test the hypothesis for Cohort C that the proportion of patients will have an Overall Response Rate (ORR) of \>60% to reveal that POM+DARA+LD-Dex is efficacious in pretreated patients who are refractory to lenalidomide. This treatment will be in only Japanese patients.
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Overall response rate (ORR)
Timeframe: Approximately 2 years