This came out today "Report of the Interagency Breast Cancer and Environmental Research Coordinating Committee".  The full report is available on line at http://www.niehs.nih.gov/about/assets/docs/ibcercc_full.pdf.  There is a summary and here are a few excerpts. I added my 2 cents in parentheses. 
1) While recognizing the link between breast cancer risk and family history, the committee said "most breast cancers, however, occur in people with no family history, so environmental factors -- broadly defined -- must play a major role in the etiology of the disease."  (BREASTFEED)
2) The committee defined the "environment" broadly as lifestyle and behavior, such as alcohol and exercise; chemical agents like pesticides, pollutants, products and medications; physical agents like diagnostic and other radiation; and, the influence of society and culture on breast cancer. Breast development should be studied to facilitate prevention, the report said. (BREASTFEED).
3)  It recommended studying the environment of underserved populations, where black women show the highest breast-cancer death rates although they have a lower incidence rate than white women. Black women are more likely to be diagnosed before age 40 with late-stage cancer, and are more likely to be diagnosed with more aggressive tumors (is it a coincidence that black women have the lowest rates of BREASTFEEDING, but highest incidence of breast cancer?)
4) Prevention does not come easily. The issues must be discussed widely, broadly, often, and vigorously to inform science, public health practice, and policy." (BREASTFEEDING)

In this 270 page report, breastfeeding is mentioned very little, nor are the key players in breastfeeding research. 

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