Real-world effectiveness of ixazomib, lenalidomide and dexamethasone in Asians with relapsed/refractory multiple myeloma.

Randomized clinical trials have shown ixazomib, lenalidomide and dexamethasone (IRd) to be efficacious and safe in Asian patients with relapsed/refractory multiple myeloma (RRMM); however, real-world data are limited. The APEX study was a multicenter, observational cohort study of IRd conducted at 16 sites across South Korea, Malaysia, and Thailand. Overall, 104 patients treated with IRd during 2016-2023 were enrolled; data were collected by retrospective chart review and 6-month prospective follow-up. Median age at IRd initiation was 64.0 years. The primary endpoints of median time to next treatment (TTNT) and overall response rate (ORR) were 32.1 months and 72.1%, respectively (though ORR varied across countries). The secondary endpoint of median progression-free survival was 27.7 months, while median overall survival was not reached. Median TTNT and ORR were higher in elderly patients (≥65 and/or ≥70 years) than in the overall population. Adverse events occurred in 90.4% and serious adverse events occurred in 29.8% of all patients; common Grade ≥ 3 adverse drug reactions were pneumonia (9.6%), neutropenia (7.7%), and gastroenteritis (2.9%). This study demonstrated that IRd was safe and effective in real-world practice in Asia, including for elderly patients, and the results are aligned with TOURMALINE-MM1 and other real-world studies.