Effects of Soy Phytoestrogens Genistein and Daidzein on Breast Cancer Growth

What is it about?

Soy products are commonly advocated for menopausal symptoms. However, soy contains genistein and daidzein which may stimulate existing breast tumor growth and antagonize the effects of tamoxifen.

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Why is it important?

Women with current or past breast cancer should be aware of the risks of potential tumor growth when taking soy products.