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Nutritional Epidemiology

Consumption of Coffee, but Not Black Tea, Is Associated with Decreased Risk of Premenopausal Breast Cancer

Department of Epidemiology, Roswell Park Cancer Institute, Buffalo, NY and ^* School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY

¹ To whom correspondence should be addressed. E-mail: kirsten.moysich{at}roswellpark.org.

ABSTRACT

Caffeine has been suggested as a possible risk factor for breast cancer, potentially through its effect of facilitating the development of benign breast disease. However, coffee and tea also contain polyphenols, which exhibit anticarcinogenic properties. A hospital-based, case-control study was conducted to evaluate the role of coffee, decaffeinated coffee, and black tea in breast cancer etiology. Study participants included 1932 cases with primary, incident breast cancer and 1895 hospital controls with nonneoplastic conditions. All participants completed a comprehensive epidemiological questionnaire. Among premenopausal women, consumption of regular coffee was associated with linear declines in breast cancer risk (P for trend = 0.03); consumers of 4 cups/d experienced a 40% risk reduction (odds ratio = 0.62, 95% CI 0.39–0.98). No clear associations between intake of black tea or decaffeinated coffee and breast cancer risk were noted among premenopausal women, although black tea was associated with a protective effect unique to a subsample of cases with lobular histology. Among postmenopausal women, breast cancer risk was not associated with consumption of coffee, tea, or decaffeinated coffee. Results among postmenopausal women did not differ by histologic subtype. Our findings support a protective effect of coffee intake on premenopausal, but not postmenopausal breast cancer risk. Further studies are warranted to confirm these findings.

KEY WORDS: • breast neoplasms • coffee • tea • caffeine • case-control studies

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