Characterization of social determinants of health in patients considered for participation in treatment clinical trials at a community cancer center serving the Great Plains.
Authors: Stacey Logan , Xu Bing , Elsey Rachel , Meissner Tobias , Hattum Crystal , Deaton McKenna , Lockhorst Robin , Bertram Michaela , Starks David , Williams Casey B. 
Published: May 2024

e13704 Background: Avera Cancer Institute, a community-based cancer network comprised of six rural cancer centers in SD and MN, provides care to a five-state region in the upper mid-west covering 72,000 square miles and offers several clinical trials to patients to offer access to advanced treatment for malignancies. Malignances are known to disproportionally affect patients that are older, rural, minorities, and have lower socioeconomic status, which are all less likely to enroll into clinical trials. Methods: Patients evaluated for participation in clinical trials from 2018-2022 were identified in an institutional database. Trial type was designated as either a treatment or nontreatment trial. Status of trial involvement was designated between enrolled or screened. Their demographic information was obtained from the electronic health record (EHR). Demographic information obtained from the EHR includes race, ethnicity, language spoken, gender, employment status, insurance type, and if they live in an urban or rural area as defined by the US Census Bureau. Clinical trial portfolio during this time includes trials for breast, gynecological, gastrointestinal, lung, and hematologic malignancies. Results: 4,397 patients were considered for participation in a clinical trial at our institution in the studied timeframe. Of these patients, 1887 were screened for treatment trials and of that group, 773 were enrolled. 35% of participants considered for clinical trials were from urban areas while 65% considered were rural. 48% of the urban population ultimately were enrolled on a clinical trial while 44% of rural population participated. Participants who lived in an urban area 25-50 miles from our study site had an enrollment rate of 49% compared to rural enrollment of 33%, from 50-100 miles rates of 53% and 37%, from 100-250 miles rates of 29% and 41%, and from greater than 250 miles rates of 44% and 33%, respectively. 99.5% of the population was non-Hispanic, 97% were White, and 99% were English speaking. 74% of the total population were female and 26% were male. Females had an enrollment rate of 51% while males had an enrollment of 29%. Patients with no insurance enrolled in trial 62% compared to 36% of those with commercial insurance The average national Area Deprivation Index percentile for screened patients was 57 vs 59 for enrolled patients. Conclusions: This retrospective study demonstrates a greater likelihood for females, urban patients, and white, English-speaking patients to enroll into clinical trials. Our data also demonstrate a preference for uninsured patients to enroll into clinical trials, possibly due to the financial benefits they may provide. Further directions include comparing our patients considered for clinical trials to all patients treated at our institution to identify potential disparities in care.