By: Caroline Seymour From: onclive.com The utility of circulating tumor DNA (ctDNA) continues to unfold in breast cancer, explained Joyce A. O’Shaughnessy, MD—citing the first results of the plasmaMATCH trial as the most recent demonstration of precision medicine in the field. In the trial, approximately 1000 patients with metastatic breast cancer underwent ctDNA testing. Patients were grouped into 1 of …