No evidence that soy estrogens increase cancer risk
02/01/06 11:53 AM
NO EVIDENCE THAT SOY ESTROGENS INCREASE CANCER RISK
Unlike traditional estrogen therapy, studies suggest that a diet high in the natural plant estrogens found in soy does not increase the risk of uterine cancer in postmenopausal women according to Mark Cline, associate professor of comparative medicine at Wake Forest University Baptist Medical Center.
Soy plants contain estrogen-like compounds called isoflavones or phytoestrogens. These plant estrogens are thousands of times weaker than the estrogen produced by the body but may be present in much higher concentrations in the blood. Evidence about the safety of soy isoflavones has been mixed. It is known that populations typically consuming high soy diets have much lower rates of uterine cancer.
Dr. Cline reported that preliminary results from a two-year study of 375 women half of whom consumed 58mg of soy isoflavones per day and the other half a placebo. No relationship between the soy and endometrial proliferation was shown. Investigators at other institutions have made similar findings.