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Bristol-Myers Squibb
The European Commission (EC) has approved elotuzumab (Empliciti) for use in combination with lenalidomide and dexamethasone to treat patients with multiple myeloma (MM) who have received at least one prior therapy.
Elotuzumab is an immunostimulatory antibody that specifically targets signaling lymphocyte activation molecule family member 7 (SLAMF7), a cell-surface glycoprotein expressed on myeloma cells, natural killer (NK) cells, plasma cells, and specific immune cell subsets of differentiated cells in the hematopoietic lineage.
Elotuzumab has a dual mechanism of action. It directly activates the immune system through NK cells via the SLAMF7 pathway, and it targets SLAMF7 on myeloma cells, tagging them for NK-cell-mediated destruction via antibody-dependent cellular toxicity.
Elotuzumab is the first immunostimulatory antibody approved to treat MM in the European Union.
Bristol-Myers Squibb and AbbVie are co-developing elotuzumab, with Bristol-Myers Squibb solely responsible for commercial activities.
Phase 3 trial
The EC approved elotuzumab based on data from the phase 3 ELOQUENT-2 trial, which were presented at ASCO 2015 and published in NEJM.
The trial included 646 MM patients who had received 1 to 3 prior therapies.
The patients were randomized 1:1 to receive either elotuzumab at 10 mg/kg in combination with lenalidomide and dexamethasone (len-dex) or len-dex alone in 4-week cycles until disease progression or unacceptable toxicity.
Baseline patient demographics and disease characteristics were well balanced between treatment arms.
The minimum follow-up for all study subjects was 24 months. The co-primary endpoints were progression-free survival (PFS) and overall response rate.
The overall response rate was 78.5% in the elotuzumab arm and 65.5% in the len-dex arm (P=0.0002).
The median PFS was 19.4 months in the elotuzumab arm and 14.9 months in the len-dex arm (P=0.0004). At 1 year, the PFS was 68% in the elotuzumab arm and 57% in the len-dex arm. At 2 years, the PFS was 41% and 27%, respectively.
The most common adverse events in the elotuzumab arm and len-dex arm, respectively, were fatigue (61.6% vs 51.7%), diarrhea (46.9% vs 36.0%), pyrexia (37.4% vs 24.6%), constipation (35.5% vs 27.1%), cough (34.3% vs 18.9%), peripheral neuropathy (26.7% vs 20.8%), nasopharyngitis (24.5% vs 19.2%), upper respiratory tract infection (22.6% vs 17.4%), decreased appetite (20.8% vs 12.6%), and pneumonia (20.1% vs 14.2%).
Serious adverse events occurred in 65.4% of patients in the elotuzumab arm and 56.5% in the len-dex arm. The most frequent events were pneumonia, pyrexia, respiratory tract infection, anemia, pulmonary embolism, and acute renal failure.
