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Dietary Patterns and Breast Cancer Risk in the Shanghai Breast Cancer Study

¹ Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts; ² Vanderbilt Epidemiology Center, Department of Medicine, School of Medicine, and ³ Vanderbilt-Ingram Cancer Center, Vanderbilt University, Nashville, Tennessee; ⁴ Division of Population Science, Fox Chase Cancer Center, Philadelphia, Pennsylvania; and ⁵ Department of Epidemiology, Shanghai Cancer Institute, Shanghai, People's Republic of China

Requests for reprints: Marilyn Tseng, Fox Chase Cancer Center, 333 Cottman Avenue, Philadelphia, PA 19111. Phone: 215-728-5677; Fax: 215-214-1632. E-mail: m_tseng{at}fccc.edu

The association of breast cancer with dietary patterns such as a western diet has not been studied in Asian women. We examined this among Shanghai Breast Cancer Study participants. Cases were of ages 25 to 64 years, diagnosed 08/1996-03/1998, and identified through a rapid case ascertainment system supplemented by the Shanghai Cancer Registry. Controls, selected from the general population of urban Shanghai, were frequency matched to cases by 5-year age group. Participants provided information on diet, lifestyle, and reproductive factors. In principal component analysis among 1,556 controls, two patterns emerged: a "vegetable-soy" pattern (tofu, cauliflower, beans, bean sprouts, green leafy vegetables) and a "meat-sweet" pattern (shrimp, chicken, beef, pork, candy, desserts). In adjusted unconditional logistic regression analyses including 1,446 cases and 1,549 controls with complete covariate data, risk was not associated with the vegetable-soy pattern. It was associated with the meat-sweet pattern (4th versus 1st quartile: odds ratio, 1.3; 95% confidence interval, 1.0-1.7; P_trend = 0.03), but only in postmenopausal women, specifically among those with estrogen receptor–positive tumors (4th versus 1st quartile: odds ratio, 1.9; 95% confidence interval, 1.1-3.3; P_trend = 0.03). Our findings indicate that a western diet increases breast cancer risk in postmenopausal Chinese women. They also suggest the value of quantifying aggregate risk for common combinations of foods. (Cancer Epidemiol Biomarkers Prev 2007;16(7):1443–8)

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