Soy Foods Safe To Eat After Breast Cancer: Study

Soy foods hasve been found to be safe to eat after suffering from breast cancer, according to researchers.

HealthDay News reports that Dr. Xiao Ou Shu, a professor of epidemiology and medicine at Vanderbilt University Medical Center in Nashville, said, "We did not see any evidence that soy intake after breast cancer increases the risk of recurrence or deaths [from breast cancer]."

"Our study indicated that soy food intake among breast cancer survivors is safe and may reduce the risk of recurrence," she said.

She emphasized she is talking about soy foods, such as tofu and soybeans, and not soy supplements.

For the study, Shu evaluated data on 9,515 women who had participated in one of three studies of breast cancer survivors: Life After Cancer Epidemiology, Women's Healthy Eating and Living and the Shanghai Breast Cancer Survival studies.

Shu reviewed information from food questionnaires on the women's soy food intake. The average time between breast cancer diagnosis and soy food evaluation was about 14 months, reports HealthDay News.

After a follow-up that averaged 7.4 years, Shu found 1,348 breast cancer recurrences and 1,171 deaths from breast cancer and other causes.

Compared to the women who ate the least soy, HealthDay News reports, women in the upper 10th percentile group for soy food intake had a 35 percent reduced risk of recurrence.

Those who ate the most soy also had a 17 percent reduced risk of death from all causes during the follow-up, but that finding did not reach statistical significance, Shu said.Soy food consumption was considerably higher in the Shanghai group than among the U.S. participants, reports HealthDay News.Shu said there has been "widespread concern about the safety of soy food for women with breast cancer" due to soy foods containing large amounts of isoflavones.Isoflavones are known to bind to estrogen receptors and have both estrogen-like and anti-estrogenic effects.This has led to concerns among breast cancer patients that isoflavones may increase the risk of cancer recurrence because they have low estrogen levels due to cancer treatment, reports HealthDay News. "We're particularly concerned that isoflavones may compromise the effect of tamoxifen on breast cancer treatment because both tamoxifen and isoflavones bind to estrogen receptors," Shu said.The research is to be presented Tuesday at the American Association for Cancer Research's annual meeting in Orlando, Fla. Results of studies presented at meetings are considered preliminary until published in a peer-reviewed journal, HealthDay News reports.
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