Factors to consider in the association between soy isoflavone intake and breast cancer risk

Posted by Chantel M. Contributed by US National Library of Medicine National Institutes of Health


In the investigation of "Factors to consider in the association between soy isoflavone intake and breast cancer risk" by Nagata C., posted in US National Library of Medicine National Institutes of Health, researchers found that soy intake was inversely associated with breast cancer risk in Asian but not Western populations, which indicates that protection against breast cancer may require that women consume levels of soy typical in Asian diets. In addition to the amount of soy isoflavones consumed, the form and food source of isoflavones, timing of isoflavone exposure, estrogen receptor status of tumors, and equol-producer status and hormonal profile of individuals may modify the association between soy isoflavone intake and the risk of breast cancer. These factors might explain the heterogeneity of results from studies. This present report contrasts background data from Japanese and Western women to identify the potential modifying of these factors.

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