Breast cancer risk and alcohol

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In the largest cohort study examining the relationship between alcohol and breast cancer, over 100,000 women in the Nurses’ Health Study were followed from 1980 until 2008.

The study analyzed the small increased risk of breast cancer for women who had alcohol consumption as low as three to six drinks per week, compared to abstainers. There was a 10% increase in risk associated with each 10 g per day of alcohol intake, and breast cancer risk was linearly correlated with cumulative lifetime alcohol intake (JAMA 2011;306:1884).