Carfilzomib, dexamethasone, and daratumumab in Asian patients with relapsed or refractory multiple myeloma: post hoc subgroup analysis of the phase 3 CANDOR trial.

Background: Due to increasing use of frontline lenalidomide, effective and safe lenalidomide-free therapies for relapsed/refractory multiple myeloma (RRMM) are needed in Asia. This subgroup analysis of phase 3 CANDOR study evaluated efficacy and safety of KdD vs Kd in Asian patients with RRMM.

Methods: Self-identified Asian patients with RRMM (KdD = 46; Kd = 20) with 1‒3 prior therapies were included. The primary endpoint of progression-free survival was estimated by stratified Cox regression.

Results: Baseline demographics and patient characteristics were balanced in both arms. KdD reduced the risk of progression or death by 25% vs Kd [hazard ratio (HR) = 0.75; 95% CI 0.259, 2.168] in the Asian subgroup, compared with 37% vs Kd (0.63; 0.464, 0.854) in the overall CANDOR population. Percentage of patients who reported grade ≥ 3 treatment-emergent adverse events (TEAEs) in the KdD and Kd arms was 95.7 and 90.0%, respectively. Serious AEs were observed in 58.7 and 40.0% of patients in the KdD and Kd arms, respectively. There were two (4.3%) fatal TEAEs in the KdD arm due to infections.

Conclusions: There was a trend toward better efficacy and a favorable benefit-risk profile for KdD vs Kd in Asian patients with RRMM. Cautious interpretation is warranted due to small patient size.