Abstract 1925: Dietary patterns and the risk of colorectal adenomas: The Black Women's Health Study

Abstract

Abstract Background: Colorectal adenomas are benign lesions that may be precursors to colorectal cancer. No studies of African American women have investigated dietary patterns and the risk of colorectal adenomas. Objective: We examined data from the Black Women's Health Study (BWHS) to determine whether dietary patterns are associated with the risk of colorectal adenomas. Methods: This is a prospective cohort study of 59,000 participants followed biennially since 1995. During 155,414 person-years of follow-up from 1997 to 2007 among women who had had at least one screening colonoscopy, 620 incident cases of colorectal adenomas were identified. Using Cox regression models, we obtained incident rate ratios (IRR) for colorectal adenoma in relation to quintiles of each of two dietary patterns, adjusting for other colorectal adenoma risk factors. Results: Two dietary patterns, Western and prudent, were utilized to assess the association between dietary intake and adenoma risk. The highest quintile of prudent diet, relative to the lowest quintile, was significantly associated with 34% reduced colorectal adenoma risk overall (incidence rate ratio, IRR=0.66; 95% CI, 0.50-0.87; p for trend, < 0.01). Higher scores on the Western pattern were associated with higher risk of colorectal adenoma (IRR = 1.42, 95% CI 1.09-1.85 for the highest quintile relative to the lowest; p trend, 0.01). Conclusion: Our findings suggest that African American women may be able to reduce their risk of developing colorectal adenomas by following a prudent dietary pattern and avoiding a more Western pattern. Citation Format: {Authors}. {Abstract title} [abstract]. In: Proceedings of the 102nd Annual Meeting of the American Association for Cancer Research; 2011 Apr 2-6; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2011;71(8 Suppl):Abstract nr 1925. doi:10.1158/1538-7445.AM2011-1925