A recent review of several studies found women who eat soy-based foods such as soy curd and soy protein, have less risk for certain cancers in the ovaries and the lining of the uterus.

Also, in a large group of breast cancer survivors in China, researchers found that a higher intake of soy food was associated with a lower risk of death or recurrence of breast cancer during follow up.

    Comments: For some reason there are a lot of websites that promote fear about soy consumption claiming that even tiny amount of soy intake can be toxic. I don't know how all this came about but I mention these studies just to add another bit of research that intakes of small amounts of soy are not toxic. 

My full position on this topic is outlined at http://www.raysahelian.com/soyprotein.html.