P-241: African American Relapsed/Refractory Multiple Myeloma patients have a Progression Free Survival benefit with selinexor treatment in the STORM study

Introduction: Multiple Myeloma (MM) is the 2nd most common hematologic malignancy in the US, though survival in patients with MM has increased over the past decade. Survival improvements in African Americans (AAs) have been smaller, which may be due to disparity in access to therapies. There are also key differences in MM biology between races.
Given underrepresentation of minorities in clinical trials, we analyzed whether outcomes were similar between AAs and other races in the phase 2 STORM trial (NCT02336815) of selinexor. Selinexor, an oral, first-in-class selective inhibitor of nuclear export via exportin 1, has proven efficacy for refractory MM. This is the first race subgroup analysis of selinexor in MM clinical trials.

Methods: Pts from STORM who received study drug (N=202) were included. Pts with heavily pretreated MM, including triple-class and penta- refractory MM refractory to the last line of therapy were given selinexor (80mg) + dexamethasone (20mg) twice weekly. We conducted a retrospective racial subgroup analysis. Cox proportional modeling was used to determine the hazard ratio (HR) for MM relapse between races controlling for covariates.

Results: AAs represented 17% of pts (35 AAs, 148 White, 2 Asian, 11 other and 6 missing). AAs were younger compared to other races (median age 60.7 vs 65.3) with more females (74.3% vs 40.7%). Cytogenetic abnormalities and R-ISS staging were similar between races. AAs had a median progression free survival (PFS) of 6.5 mos (95% CI 4.7, NR) compared with 3.7 mos (95% CI 2.8, 4.6; p = 0.035) for other races. Overall response rate (ORR) was 25.7% (95% CI 12.5, 43.3) in AA pts vs 23.4% [17.2, 30.5] in other races), clinical benefit rate (37.1% [21.5, 55.1] vs 35.9% [28.7, 43.7]), median duration of response (5.6 mos [2.1, NR] vs 5.3 [3.6, NR]), median duration of treatment (9 wks [IQR 3-22 wks] vs 8 wks [4-16 wks]), and mean dose intensity (117.9 mg/wks [STD 35.1] vs 117.1 [34.7]) were similar between groups. Rates of Adverse Events (AEs) ≥ grade 3 (94.3% vs 95.8%), and AE-related dose reductions (45.7% vs 54.5%), discontinuations (22.9% vs 30.5%), and deaths (5.7% vs 10.8%) were also similar. The adjusted HR for MM relapse in AAs was 0.45 (95% CI 0.22, 0.92; p=0.028) after controlling for gender, age and prior therapy.

Conclusions: This subgroup analysis showed that compared with other races, AAs pts were younger and included a greater percentage of women. Although ORRs were similar, AAs had a longer PFS compared with other races after adjusting for covariates. Despite small sample size, the differences were statistically significant. Dose adjustments and tolerability were relatively comparable. It is unclear if the better PFS reflects a different biology, pharmacology of selinexor or both. These results could assist in the placement of selinexor in the treatment sequence of relapsed refractory MM for AAs.