New blood test could spot hidden breast cancer before scans do

This study is for people with a high-risk type of breast cancer (triple-negative) who still have cancer cells left after standard treatment and surgery. Researchers will use a special blood test (ctDNA) to look for tiny traces of cancer DNA that scans might miss. If the test finds cancer, participants will receive an experimental drug called Dato-DXd to try to eliminate it. The goal is to see if this approach can catch and treat recurrence earlier than usual.