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Background: The recent COVID-19 pandemic expanded opportunities for remote oncology telehealth visits. However, reliable internet connectivity, digital literacy, and patient comfort with virtual medical visits may differ among patients, especially socially disadvantaged groups. The primary aim of this study was to identify patient demographics and social determinants of health (SDOH) which might limit access to remote telehealth services. Methods: First, a retrospective analysis was performed of composite administrative data of all patient visits to a large regional cancer center over the COVID-19 pandemic (3/2020-4/2022). Second, a prospective, cross-sectional study was conducted of patients with known or suspected malignancy presenting to the same center over six-months (11/2021-5/2022). Participants were asked a standard set of survey questions regarding telehealth accessibility during an in-person clinic visit. Demographics and SDOH were abstracted from the electronic health record (EHR). Results: Although Black patients comprised 43% (n=9,021) of all patient visits (n=20,953), the proportion of telehealth visits conducted among Black patients (29%; n=889) was significantly lower compared to White patients (71%, n=2,142, p<0.0001). Within the cross-sectional study cohort (n=149), 51% (n=76) were Black, 39% (n=58) resided in a rural county, and 8.7% (n=13) were uninsured or Medicaid-insured. Black participants were more likely to self-report lack of internet access (73.7% vs. 90.4%, p<0.01) and were less likely to report having access to or actively using a patient portal in the EHR compared to White patients (47.4% and 79.5%, respectively; p<0.001). Rates of self-reported access to video-capable devices (82.9% vs. 90.4%) and confidence in conducting video visits without assistance (59.2% vs. 68.5%) were similar among Black and White patients (p>0.05). The most common self-identified challenge to telehealth usage among both races was limited digital literacy. Conclusions: Black patients disproportionally under-participated in telehealth visits, suggesting underlying structural disparities in access to digital care. A greater proportion of Black participants self-reported lack of internet access and access to a patient portal to the EHR compared to White patients. Ensuring equal internet access and digital literacy will be critical to reduce further disparities in cancer care among racial minorities. Citation Format: John A. Iasiello, Arvind Rajan, Emmanuel Zervos, Alexander A. Parikh, Rebecca A. Snyder. Patient-reported access to telehealth: An important and unmeasured social determinant of health [abstract]. In: Proceedings of the 15th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2022 Sep 16-19; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2022;31(1 Suppl):Abstract nr B105.