This sounds like it could be at least part of the reason African-American women have a higher rate of breast cancer than European-Americans.
http://www.sciencedaily.com/releases/2009/01/090122080721.htm
ScienceDaily (Jan. 22, 2009) — Dr. Michael Lisanti and colleagues at Thomas Jefferson University found that extended lactation protects again mammary tumor development.
Women who breastfeed for greater than two years have a significantly reduced risk of developing breast cancer later in life.
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