How important is folate intake for reducing breast cancer risk from alcohol consumption? – International Scientific Forum on Alcohol Research Critique 202
The strongest factor associated with the risk of a woman developing breast cancer appears to be a positive family history of such a diagnosis in a sibling or mother. Among environmental factors, almost all studies have shown that alcohol consumption relates to increased risk; a slight increase is often seen even among women who report only light drinking - an average of less than one drink per day, for example.