Blood test could unlock cancer secrets for thousands of patients

This study is collecting blood samples from 1,000 people with digestive, gynecologic, or breast cancer to study tiny bits of tumor DNA and particles called exosomes floating in the blood. Researchers want to see if these markers can help predict how the cancer will behave, whether treatments are working, and if the cancer is coming back. Participants give blood at several time points during their standard cancer care, and the results may lead to better, less invasive ways to monitor cancer in the future.