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By Mark Messina, PhD, MS,
The position of the American Cancer Society, the American Institute for Cancer Research and the World Cancer Fund International is that breast cancer survivors can safely consume soyfoods. In fact, the latter organization concluded that post-diagnosis soy intake may improve the survival of breast cancer patients; a conclusion consistent with the epidemiologic data. Chi et al. meta-analyzed the results of 5 prospective studies, 3 from China and 2 from the U.S., and found that among the >11,000 women with breast cancer, soy intake reduced recurrence and mortality by a statistically significant 26% and 16%, respectively. More recently, Qiu and Jiang meta-analyzed a similar dataset and found reductions in risk of similar magnitudes, but the findings were not quite statistically significant.