Journal
JNCI-JOURNAL OF THE NATIONAL CANCER INSTITUTE
Volume 105, Issue 20, Pages 1571-1578Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/jnci/djt213
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Funding
- National Cancer Institute, National Institute of Health [R01 CA050385, R01 CA046475]
- American Cancer Society Clinical Research Professorship
- Breast Cancer Research Foundation
- Foundation for Barnes Jewish Hospital, St Louis, Missouri
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Adult alcohol consumption during the previous year is related to breast cancer risk. Breast tissue is particularly susceptible to carcinogens between menarche and first full-term pregnancy. No study has characterized the contribution of alcohol consumption during this interval to risks of proliferative benign breast disease (BBD) and breast cancer. We used data from 91005 parous women in the Nurses Health Study II who had no cancer history, completed questions on early alcohol consumption in 1989, and were followed through June 30, 2009, to analyze breast cancer risk. A subset of 60093 women who had no history of BBD or cancer in 1991 and were followed through June 30, 2001, were included in the analysis of proliferative BBD. Relative risks (RRs) were estimated using Cox proportional hazard regression. We identified 1609 breast cancer cases and 970 proliferative BBD cases confirmed by central histology review. Alcohol consumption between menarche and first pregnancy, adjusted for drinking after first pregnancy, was associated with risks of breast cancer (RR 1.11 per 10g/day intake; 95% confidence interval [CI] 1.00 to 1.23) and proliferative BBD (RR 1.16 per 10g/day intake; 95% CI 1.02 to 1.32). Drinking after first pregnancy had a similar risk for breast cancer (RR 1.09 per 10g/day intake; 95% CI 0.96 to 1.23) but not for BBD. The association between drinking before first pregnancy and breast neoplasia appeared to be stronger with longer menarche to first pregnancy intervals. Alcohol consumption before first pregnancy was consistently associated with increased risks of proliferative BBD and breast cancer.
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