Metformin used for treatment of type 2 diabetes, shows good results in survivalfor breast cancer patients and was promising for treatment of endometrial hyperplasia. These results were presented by researchers from the Prelman Scool of Medecine at the University of Pennsylvania at the American Society of Clinical Oncology annual meeting.
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https://www.eurekalert.org/pub_releases/2016-06/uops-ddm060316.php