Women with a family history of breast cancer breast-feeding their infants breast have a risk of developing the disease reduced by at least 60%.It is the opinion of Alison Stuebe, University of North Carolina at Chapel Hill and his colleagues, who published in the Archives of Internal Medicine the findings of a study of women who had given birth to a child at least once.
According to the observed reduction of risk due to weaning from the breast of women with a family history of the disease appears comparable to that achieved by hormonal treatment.
Looking at the around 60 thousand women participating in a prospective study of the Nurses' Health Study II, from 1997 to 2005, Stuebe and colleagues identified 608 cases of breast cancer in pre-menopausal age. In comparison with women who never breastfed, those that had showed a relative risk (ratio of the rate in the exposed population and the population not exposed to a risk factor in this case for family history) to develop the same disease reduced by 25%, regardless of the duration of breastfeeding.
Another fact worthy of note, according to the researchers, is that among women with a mother or sister with breast cancer, those who had ever breastfed showed a lower risk rate of 59% in comparison with those who had never breastfed.
Among women without a family history of disease, there was no association observed on the contrary, "perhaps because - the researchers note - there is something about the genetic causes of breast cancer by influencing breast-feeding, or because - he concludes the team - the rates of disease were so low in women without a family history can not show any association between the data available. "
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