Safety and Efficacy of Belantamab Monotherapy and in Combination Treatments for the Treatment of Multiple Myeloma

The purpose of this study is to determine whether a new investigational combination of drugs, that contains belantamab mafodotin with belantamab, will be as effective, and more tolerable, compared to belantamab mafodotin alone in participants with multiple myeloma that has become active again after at least three prior lines of treatment.