http://medicalxpress.com/ en-us Medical Xpress internet news portal provides the latest news on Health and Medicine. A recently discovered enzyme drives the production of a potent form of estrogen in human breast cancer tissue, researchers from the University of Illinois at Chicago College of Medicine have found. http://medicalxpress.com/news/2011-05-enzyme-breast-cancer-growth.html Cancer Wed, 18 May 2011 16:14:24 EST news224954046