Melanie Rutkowski, University of Virginia (IMAGE) University of Virginia Health System Caption Melanie Rutkowski, PhD, of the UVA School of Medicine and the UVA Cancer Center, has found that an unhealthy microbiome promotes the spread of hormone receptor-positive breast cancer. Credit Dan Addison | UVA Usage Restrictions May be used to accompany news coverage of the breast cancer discovery. All other uses require express written permission from UVA Health System. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.