 What about soy food intake and breast cancer survival? We didn't have a clue until 2009 when the LACE study was published Life After Cancer Epidemiology. About 2,000 California breast cancer survivors followed for nine years. Postmenopausal women on the Estian-blocking drug Tomoxifin, who got the most of the soya seflavone in their diet, had the lowest rate of breast cancer recurrence. They were to cut breast cancer recurrence in half. Soy was, if anything, protective, but you can't just sprinkle some soy sauce. It took soy levels comparable to those consumed in Asian populations, one or two servings a day, to reduce the risk of cancer coming back. Then came the famous Journal of the American Medical Association study, the biggest yet 5,000 breast cancer survivors. Conclusion. Among women with breast cancer, soy food consumption was significantly associated with decreased risk of death and recurrence. Now this isn't taking soy isoflavone supplements. This was actually eating soy foods. The potential benefits are confined to soy foods, and inferences should not be made about the risk or benefits of soy-containing dietary supplements. Patients with breast cancer can be assured that enjoying a soy latte or indulging in pad Thai with tofu causes no harm, and when consumed in plentiful amounts, may reduce the risk of disease recurrence. And finally, 2011 soy food consumption and breast cancer prognosis, a third study. The only three such studies in existence and soy is 3 for 3, as isoflavone intake increased, risk of death decreased. What more do we need to know?