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New analysis from the Nurses' Health Study: Association of alcohol with risk of breast cancer
Date:11/3/2011

A well-done analysis by Chen WY et al, published in JAMA assesses the association of moderate alcohol consumption during adult life, drinking patterns, and breast cancer risk. The authors use prospectively collected data from the 105,986 women enrolled in the Nurses' Health Study followed up from 1980 until 2008 with an early adult alcohol assessment and 8 follow ups.

The International Scientific Forum of Alcohol Research comments 'A large percentage of observational prospective studies have shown that women who consume alcohol show an increase in their risk of developing breast cancer. In general, the relation seems to be stronger for women who drink in binges, are also taking post-menopausal hormonal therapy, and/or have low intakes of dietary folate. Most studies have shown that heavier drinkers are at the greatest risk'.

In this study, the risk of breast cancer was found to be modestly increased among consumers of alcohol, even those whose total alcohol consumption was reported to be in the range of 3 to 6 drinks/week. Similar small increases in the risk of breast cancer have been found from alcohol consumption in the majority of previous studies observational studies. A strength of this study was the very large number of subjects, permitting the investigators to attempt to determine if both the amount of alcohol and the frequency of consumption were important in this association; strong effects were not found for either. When adjusting for the cumulative lifetime consumption, there was no effect of the frequency of consumption (1-2, 3-4, or 5-7 days per week).

A weakness in the paper, is a failure to report on the effects of diet and folate intake on the association between alcohol and breast cancer risk; the same investigators have previously shown that folate is a potential moderator of the effects of alcohol on breast cancer risk.

The authors describe well the dilemma that women face regarding alcohol in
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Contact: R. Curtis Ellison
ellison@bu.edu
508-333-1256
Boston University Medical Center
Source:Eurekalert

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