Soya - Information about Soy and Soya Products
Soy isoflavones reduce risk of breast cancer recurrenceSoy foods are rich in isoflavones and have been hypothesized to reduce the risk of breast cancer, but their similar structure to that of estrogen and a possible interaction between isoflavones and anti-cancer drugs have caused concern about soy food consumption by breast cancer patients. The soy isoflavone genistein has been shown to stimulate the proliferation of cultured breast cancer cells and to promote growth of estrogen-dependent mammary tumors implanted in ovariectomized rats. A study published in the Canadian Medicinal Association Journal investigated the effect of soy isoflavones intake on the recurrence of breast cancer and death for patients receiving adjuvant endocrine therapy.
The study concluded that high dietary intake of soy isoflavones was associated with lower risk of recurrence among postmenopausal women with estrogen and progesterone positive breast cancer and those receiving the anti-cancer drug anastrozole.
Source: Effect of soy isoflavones on breast cancer recurrence and death for patients receiving adjuvant endocrine therapy. CMAJ. 2010 Oct 18.