The use of novel therapies, such as immunomodulatory drugs (IMiDs), proteasome inhibitors (PIs), and monoclonal antibodies (mAbs; ie, isatuximab, daratumumab, elotuzumab), has significantly improved the outcomes of multiple myeloma (MM) patients. However, MM remains largely incurable, with the majority of patients becoming refractory to available therapies and eventually relapsing.