8/11/2010

A U.S. study showed a higher risk of breast cancer among thinner women who used hormone replacement therapy than among women with a higher body mass index. Researchers also found that women who used estrogen therapy for at least 15 years had a 19% increased risk of breast cancer compared with nonusers, while those on combination estrogen and progestin for more than 15 years had an 83% increased risk.

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