Results: 17 patients were enrolled into the Y3 arm. The average age was 62 (51-79), 65% were male with a median of 29 months since initial diagnosis and a median of 2 prior lines of therapy. The ORR (> PR) was 52.9% with a clinical benefit rate (> MR) of 58.8%. The median progression free survival was 10.2 months ( 95% CI: 3.9; 12.9) with a median overall survival which has not yet been reached; with all 17 patients still alive at the current data cutoff. No dose-limiting toxicities were seen. Eight patients (47.1%) experienced a serious AE with 2 patients (11.8%) experiencing an AE leading to treatment discontinuation. Two patients (11.8%) required dose reductions. The most common non-hematologic AEs were fatigue, nausea and constipation; all of which were grade 1 and 2.

Conclusions: In this platform study of patients with relapsed, functionally high-risk MM, patients who received Seli-IPd exhibited significant efficacy and a manageable AE profile. Furthermore, this provides an all-oral option for patients wishing to minimize their office visits and parenteral therapy administrations.