Soy product and isoflavone intake and breast cancer risk defined by hormone receptor status. 2009; Cancer Science

"he association between soy food consumption and breast cancer risk has been inconsistent. A hospital-based case–control study was conducted to assess the relationship between soy food intake and breast cancer risk according to the estrogen receptor (ER) and/or progesterone receptor (PR) status of breast cancer in Chinese women .....The protective effects of soy did not seem to differ by ER and PR breast cancer status."