Breast Cancer (IMAGE) University of Pennsylvania Caption Breast cells in which mitochondrial DNA was reduced had altered metabolism and their structure appeared disorganized (bottom image), more like that of a metastatic cancer cell. Credit University of Pennsylvania Usage Restrictions In context of reporting 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.