Review: PDF OnlyAre Women with Breast Cancer More Likely to Develop Colorectal Cancer?Eisen, Glenn M. M.D.; Sandler,, Robert S. M.D.Author Information From the Division of Digestive Diseases and Nutrition and the Center for Gastrointestinal Biology and Disease, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, U.S.A. Journal of Clinical Gastroenterology: July 1994 - Volume 19 - Issue 1 - p 57-63 Buy Abstract Breast cancer has been reported to confer greater risk for colorectal cancer. In order to estimate the magnitude of this risk, we critically reviewed all studies evaluating the association of breast and colorectal cancer and performed a meta-analysis. The combined results from seven cohort studies demonstrated a weak association between breast cancer and the subsequent risk of colorectal cancer [pooled relative risk (RR) = 1.15; 95% confidence interval (CI) = 0.99-1.31]. Pooled results from five cohort studies showed that the risk of breast cancer after colorectal cancer was similar (pooled RR = 1.10; 95% CI = 1.03-1.17). The combined results from five crosssectional/ case-control studies revealed a positive association between breast cancer and colorectal adenomas (pooled RR = 1.74; 95% CI = 1.27-2.21). Populationbased cohort studies, the strongest research design, show essentially no increase in risk of colorectal cancer in women with previous breast cancer. Based upon this evaluation, there appears little justification for special colorectal surveillance of women with previous breast cancer. © Lippincott-Raven Publishers.