Abstract A109: Colorectal cancer screen-up-to-date: 10-year prevalence in a regional safety-net health system
Authors: Nair Rasmi G. , Hu Ellen , Wang Lei , Kim Eric , Ortiz Cynthia , Lykken Jacquelyn , Skinner Celette S. , Halm Ethan 
Published: January 2023

Abstract
Introduction: Colorectal cancer (CRC) screening is an effective secondary prevention method with an increased probability of diagnosing CRC at an earlier stage, and a consequent improvement in survival post-treatment. This is especially true for individuals who undergo guideline recommended screening at appropriate intervals. Studies have reported a consistent rise in long-term trends of guideline-adherent screen-up-to-date (SUTD) rates among predominantly White and insured individuals. Here we use longitudinal data from 2011-2020 and report 10-year prevalence and correlates of CRC SUTD among patients in a safety-net health system. Methods: All patients aged 50-74 years who had a primary care encounter in any of the 12 community clinics in a large county safety-net health system were included. An individual was considered to be SUTD if he/she had a stool test during the calendar year, flexible sigmoidoscopy in the past 5 years, or colonoscopy in the past 10 years. To obtain a population health estimate (and not only examine frequencies), we included in the denominator patients with a primary care visit in the past 3 years. Multivariable generalized estimating equations (GEE) model was used to examine the association of SUTD status with time-varying demographic and clinical characteristics over the 10-year period. Results: Our analytical cohort had 50,647 patients in 2011, of which 40.9% (20,708) patients were SUTD. Annual rates of SUTD were largely unchanged until 2019, when the prevalence increased to 46.8% after initiation of a population health outreach mailed FIT program. The SUTD rate fell to the baseline level of 40.8% in 2020 after the pandemic-induced suspension of the mailed FIT program. Multivariable GEE model demonstrated that older patients, females, and Hispanics had higher odds of being SUTD compared to younger patients, males, and non-Hispanics, respectively. Additionally, patients who had prior interaction with the healthcare system (had prior stool tests or prior primary care encounters) had higher odds of being SUTD than those with no prior experience with the healthcare system (no prior stool tests or no prior primary care encounters). Conclusion: This study establishes contemporary evidence about the 10-year prevalence and correlates of CRC SUTD status among patients in a safety-net health system. Prevalence remained constant for most of the decade, except in 2019, when a population-based mailed FIT outreach program was implemented to complement usual visit-based screening. Despite the disruptions caused by the COVID-19 pandemic, screening rates in 2020 did not drop below pre-2019 levels (~40%), though the prior increases due to the mailed FIT program were lost. We believe that effective implementation of broad population-based, screening outreach efforts are instrumental in improving and sustaining CRC SUTD rates in safety-net health systems, and can consequently help to decrease CRC incidence and related mortality.
Citation Format: Rasmi G. Nair, Ellen Hu, Lei Wang, Eric Kim, Cynthia Ortiz, Jacquelyn Lykken, Celette S. Skinner, Ethan Halm. Colorectal cancer screen-up-to-date: 10-year prevalence in a regional safety-net health system [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 A109.