Disparities in endometrial cancer clinical trial participation.

Abstract

e18514 Background: Clinical trial participation may be a way to mitigate disparities in endometrial cancer. Our objective was to examine the association of clinical trial participation with patient, health system, and cancer factors in endometrial cancer. Methods: We conducted a retrospective cohort study of patients with endometrial cancer diagnosed from 2013-2021 using the nationwide de-identified electronic health record-derived Flatiron Health database. We used multi-level Poisson regression modeling to analyze the association of clinical trial participation (receipt of clinical trial drug) with patient, sociodemographic, health system, and cancer factors. Results: Of 4,662 patients with endometrial cancer, 3.9% (95% CI 3.3-4.5) were ever enrolled in a clinical drug trial. While Black patients accounted for 12% of endometrial cancers and 59% of high-risk histologies (MMT, serous, clear cell), only 3% were enrolled in clinical trials. Black patients were 57% less likely to enroll in a clinical trial (95%CI 0.26-0.72), and this disparity persisted in academic and community settings. Having a more aggressive cancer histology and living in the Southeast were associated with higher rates of clinical trial enrollment. Conclusions: Despite higher rates of aggressive cancer histologies, Black patients were disproportionately under-enrolled in endometrial cancer drug trials. Efforts to increase clinical trial diversity are needed.[Table: see text]