International Journal of Epidemiology, Vol 28, 396-402, Copyright © 1999 by International Epidemiological Association
H Furberg, B Newman, P Moorman and R Millikan
BACKGROUND: Data from the Carolina Breast Cancer Study, a population-
based, case-control study of breast cancer in African-American and white
women residents of North Carolina, were evaluated to determine whether
specific aspects of lactation are associated with a reduction in the risk
of breast cancer. METHODS: Analyses included 751 parous cases and 742
parous controls frequency-matched on age and race. Information on
lactation, reproductive history, lifestyle characteristics and family
history were obtained through a personal interview. RESULTS: When women who
breastfed were compared to those who never breastfed, odds ratios and 95%
confidence intervals of 0.8 (0.5- 1.1) and 0.7 (0.5-0.9) were found for
women 20-49 years and 50-74 years, respectively. Similar inverse
associations were observed for each of three categories of lifetime
duration (1-3, 4-12, 13+ months). The inverse associations persisted and
did not vary when number of children breastfed, ages at first and last
lactation and lactational amenorrhoea were examined. CONCLUSIONS: Our
findings suggest that any lactation, regardless of duration or timing, is
associated with a slight reduction in the risk of breast cancer among
younger and older parous women.
ARTICLES
Lactation and breast cancer risk
Department of Epidemiology, University of North Carolina, Chapel Hill 27599-7400, USA.
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