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Breast cancer patients advised to avoid soy. (Phytoestrogens at Issue).
ARLINGTON, VA. -- Caution is the word for now on soy consumption for women with a history of breast cancer.
Epidemiologic evidence clearly demonstrates a significantly lower risk for breast cancer among women whose diets routinely contain soy products, but recent investigations have suggested that the phytoestrogens in soy may stimulate tumor cells already established in breast tissue, Mindy S. Kurzer, Ph.D., said at a conference on complementary and alternative therapies for cancer.
"At this point, in my view, the concern is theoretical. There have been no studies that have connected soy or isoflavone consumption with cancer in women," she added.
In vitro and animal studies have identified pro- and antiestrogenic effects for the isoflavone phytoestrogens such as genistein that are present in soy. These flavonoids also inhibit cell cycle progression, DNA synthesis, and angiogenesis, said Dr. Kurzer of the department of food science and nutrition at the University of Minnesota in St. Paul. Soy is seen as a ...
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Source: HighBeam Research, Breast cancer patients advised to avoid soy. (Phytoestrogens at...