Breast cancer: soy isoflavones may modify risk of disease


Increased phytoestrogens commonly found in dietary soy may modify the risk of some types of breast cancer, according to findings presented at the Ninth Annual AACR Frontiers in Cancer Prevention Research Conference.

Researchers have evaluated 683 women with breast cancer and compared them with 611 healthy women. Dietary data patterns were observed using a food frequency questionnaire and isoflavones were measured as a dietary, rather than supplemental, intake. Isoflavone intake was divided into three groups.

Those women with the highest isoflavone intake had an approximately 30% decreased risk of having an invasive breast tumor, and an approximately 60% decreased risk of having a grade 1 tumor.

Observations by menopausal status revealed the following: Among premenopausal women, the highest intake of isoflavones had a 30% decreased risk of stage I disease, a 70% decreased risk of having a tumor larger than 2 cm, and a 60% decreased risk of having stage 2 breast cancer.
These connections were not seen among postmenopausal women.

Like most dietary studies, these findings are not definitive and need to be considered in the context of further follow-up and confirmation. ( Xagena )

Source: American Association for Cancer Research, 2010

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