Study of Single Agent Belantamab Mafodotin Versus Pomalidomide Plus Low-dose Dexamethasone (Pom/Dex) in Participants With Relapsed/Refractory Multiple Myeloma (RRMM)

This open-label, randomized study for evaluating the efficacy and safety of single agent belantamab mafodotin when compared to pom/dex in participants with RRMM. Participants will be randomized in a 2:1 ratio to receive either single agent belantamab mafodotin or pom/dex. Belantamab mafodotin will be administered intravenously at 2.5 milligram (mg)/kilogram (kg) on Day 1 (D1) of an every 3 weeks (Q3W) schedule. Pomalidomide will be administered orally at the approved starting dose of 4 mg daily on Days 1 to 21 of each 28-day cycle, with dexamethasone administered orally at a dose of 40 mg once weekly (Days 1, 8, 15, and 22). Participants in both arms will be treated until disease progression, death, unacceptable toxicity, withdrawal of consent, and lost to follow-up or end of study, whichever comes first. Approximately up to 380 participants will be randomized (320 + 60 to fulfill regional country requirements).