Elotuzumab is an immunostimulatory monoclonal antibody (mAb) that recognizes Signaling Lymphocytic Activation Molecule F7 (SLAMF7), a protein highly expressed by myeloma and natural killer cells. Elotuzumab has a dual mechanism of action, directly activating natural killer cells and initiating antibody-dependent cell-mediated cytotoxicity targeted against myeloma cells, with minimal effect on normal tissues. In the 2-year progression-free survival (PFS) interim analysis of ELOQUENT-2, a Phase 3 study (NCT01239797) comparing elotuzumab plus lenalidomide/dexamethasone (ELd) with lenalidomide/dexamethasone (Ld), ELd resulted in a significant 30% reduction in the risk of disease progression or death vs Ld (hazard ratio 0.70 [95% CI 0.57, 0.85]; p=0.0004). Overall response rate (ORR) was 79% (95% CI 74, 83) in the ELd arm vs 66% (95% CI 60, 71) in the Ld arm (p=0.0002). Furthermore, the addition of elotuzumab to Ld was well tolerated, with minimal added toxicity. Elotuzumab's immunotherapeutic effect induces effective therapeutic outcomes and represents an important approach to treating multiple myeloma (MM). Here we present extended 3-year follow-up data.