Breastfeeding linked to reduced breast cancer risk

Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50302 women with breast cancer and 96973 women without the disease.

Lancet 2002;360:187-195.

 http://www.ncbi.nlm.nih.gov/pubmed/12133652

ABSTRACT

INTERPRETATION: The longer women breast feed the more they are protected against breast cancer. The lack of or short lifetime duration of breastfeeding typical of women in developed countries makes a major contribution to the high incidence of breast cancer in these countries.