There are a number of good studies now that indicate that there is a
population wide reduction in risk of development of breast cancer that seems
to have a 'dose' relationship with increased number of months spent
breastfeeding. There is at least one study that suggests there is some
reduction in risk from having BEEN breastfed. References below.
These data are not always easily extrapolated to individual experience,
because it is certainly possible for women who have breastfed, and who may,
in fact, currently BE breastfeeding, to develop breast cancer.
Breast-feeding and risk of breast cancer in young women by U.K National
Case-Control Study Group. Brit Med J 1993; 307:17-20.
P Newcomb, B Storer, M Longnecker, et al. Lactation and a Reduced Risk of
Premenopausal Breast Cancer, New Engl J Med 1994; 330(2):81-87.
P Layde, L Webster, A Baughman, et al. The Independent Associations of
Parity, Age at First Full Term Pregnancy, and Duration of Breastfeeding With
the Risk of Breast Cancer. J Clin Epidemiol 1989; 42(10):963-73.
K Yoo, K Tajima, T Kuroishi, et al. Independent Protective Effect of
Lactation against Breast Cancer: A Case-Control Study in Japan. Am J
Epidemiol 1992. 135:726-33.
I Romieu, M Hernandez-Avila, E Lazcano, et al. Breast Cancer and
Lactation History in Mexican Women, Am J Epidemiol 1996; 143(6):543- 552.
J Freudenheim, J Marshall, S Graham, et al. Exposure to breastmilk in
infancy and the risk of breast cancer. Epidemiol 1994; 5:324-31.
Barbara Wilson-Clay BSEd, IBCLC
Austin Lactation Associates
http://www.lactnews.com
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