This marks the second FDA-approved indication for Guardant360 CDx as a companion diagnostic in breast cancer treatment ESR1 mutations are present in 40% of HR+, HER2- advanced breast cancers PALO ALTO, Calif. / Sep 29, 2025 / Business Wire / Guardant Health, Inc. (Nasdaq: GH), a leading precision oncology company, today announced that the U.S. Food and Drug Administration (FDA) has approved its Guardant360 ® CDx as a... Read More