Liquid biopsies (IMAGE) Michigan Medicine - University of Michigan Caption By measuring the amount of DNA in the bloodstream that's been shed by a tumor, liquid biopsies can help guide treatment discussions for patients with metastatic cancer. Credit Justine Ross/Michigan Medicine Usage Restrictions None, free to use License Original 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.