NEW YORK (Reuters Health) Mar 02 - Strenuous recreational exercise over a long period of time appears to protect women against breast cancer, according to data from the prospective California Teachers Study.
There is some evidence in the published literature that physical activity can reduce breast cancer risk, Dr. Leslie Bernstein and her associates note in their paper, published in the Archives of Internal Medicine for February 26. Purported biological mechanisms include physical activity's effect on endogenous hormones, metabolism and immune function.
Dr. Bernstein, from the University of Southern California, Los Angeles, and her associates examined the relationship between recreational physical activity and breast cancer in a large cohort of women.
http://www.medscape.com/viewarticle/553082?sssdmh=dm1.251887&src=nldne
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