Safety Analysis of Five Randomized Controlled Studies of Daratumumab in Patients With Multiple Myeloma.

BACKGROUND

Multiple studies have demonstrated the efficacy and safety of daratumumab for relapsed/refractory multiple myeloma (MM) and primary treatment for transplant-eligible and -ineligible patients.

MATERIALS AND METHODS

We conducted an integrated safety analysis to characterize the frequency, severity, natural history, and outcomes of adverse events (AEs) with daratumumab versus comparators. Data were pooled from 5 completed phase III randomized controlled studies that had included 1798 daratumumab-treated and 1797 comparator-treated patients with MM as a first line in both transplant-eligible and transplant-ineligible patients and for relapsed/refractory disease. Safety analyses included reporting of AEs using crude and exposure-adjusted incidence rates.

RESULTS

The median follow-up duration was 16.84 months (range, 7.4-28 months) for both daratumumab-treated and comparator-treated patients. Discontinuation for any reason occurred less often with daratumumab (22% vs. 33.9%), although discontinuation because of AEs occurred at similar rates (25% vs. 26%) as did deaths owing to AEs (2.25% vs. 1.84%). When adjusted for exposure, neutropenia, lymphopenia, diarrhea, fatigue, dyspnea, pneumonia, and hypertension were the only common grade 3/4 AEs reported more often with daratumumab than with the comparators. The prevalence of common grade 3/4 AEs with daratumumab were < 7% apart from neutropenia, lymphopenia, and pneumonia (45.9% vs. 32.3%, 13% vs. 7.5%, and 10.6% vs. 7.2%, respectively). Grade 3/4 daratumumab infusion-related reactions happened in 3.8% of patients. The majority of infusion-related reactions occurred after the first infusion.

CONCLUSIONS

These results from an integrated analysis support a favorable benefit/risk profile of daratumumab in patients with MM.

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