Abstract C67: Addressing racial disparity in colorectal cancer screening with CT colonography: Experience in an African-American cohort

Abstract

Abstract Purpose: Incidence and mortality from colorectal cancer (CRC) are higher among minorities, including African Americans, compared with non-Hispanic whites, and CRC screening rates for African Americans lag behind non-Hispanic whites. The purpose of this investigation was to evaluate computed tomographic (CT) colonography performance and outcome measures in an African-American cohort. Materials and Methods: Institutional review board-approved and HIPAA-compliant study. Informed consent was waived. Retrospective evaluation of the African-American cohort from the Atlanta Veterans Affairs Medical Center CT colonography screening program. Colonoscopy referral rates and histologic diagnoses were evaluated. Results: CT colonography studies (n = 2,490; mean age 59.5 years [range 50-80]; 85.5% male), were performed between 2007 and 2016. The per-patient positive rate of CT colonography was 9.8% for polyps 6-9 mm, 5.4% for polyps 10-29 mm, and 1.3% for masses > 30 mm. Based on CT colonography findings and patient preference, 13.9% of patients were referred to optical colonoscopy and 2.9% were referred to CT colonography follow-up. Of patients recommended to undergo colonoscopy, 80.6% completed the procedure and colonic pathology was confirmed in 83.2% thereof. Histologic diagnoses were 221 tubular adenomas (161 6-9 mm; 60 > 10 mm), 60 tubulovillous adenomas/villous adenomas (14 6-9 mm; 46 > 10 mm), 31 hyperplastic polyps (26 6-9 mm; 5 > 10 mm), 17 adenocarcinomas (all > 10 mm), 10 adenomas with high-grade dysplasia (all > 10 mm), and 3 serrated polyps (1 6-9 mm; 2 > 10 mm). The per-patient positivity rate for patients who had optical colonoscopy (n = 279) was 71.3% for adenoma, 9.7% for hyperplastic polyp, and 6.1% for adenocarcinoma. Conclusions: CT colonography is an effective screening modality for African-American adults and could potentially improve rates of colorectal screening in African-Americans. Citation Format: Todd Fibus, Courtney C. Moreno, Elizabeth A. Krupinski, David H. Kim, Perry J. Pickhardt. Addressing racial disparity in colorectal cancer screening with CT colonography: Experience in an African-American cohort [abstract]. In: Proceedings of the Tenth AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2017 Sep 25-28; Atlanta, GA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2018;27(7 Suppl):Abstract nr C67.