Guardant Health IncFDA approval of Guardant360 CDx as companion diagnostic for ETCAMAH expands its approved indications and market access.
Guardant Health announced that the U.S. Food and Drug Administration has approved its Guardant360 CDx as a companion diagnostic to identify patients with HR-positive, HER2-negative advanced breast cancer with ESR1 mutations who may benefit from AstraZeneca's ETCAMAH (camizestrant). This is the first FDA-approved liquid biopsy companion diagnostic for longitudinal testing in breast cancer, enabling repeat testing every three months to detect emerging ESR1 mutations before clinical or radiographic progression. The approval is based on the Phase III SERENA-6 trial, where ctDNA-guided treatment with camizestrant plus a CDK4/6 inhibitor reduced the risk of disease progression or death by 56% compared to continuing an aromatase inhibitor with a CDK4/6 inhibitor. Patients in the new paradigm experienced a 74% longer median progression-free survival (16.0 vs. 9.2 months) and a 47% reduction in risk of deterioration in global health status. Approximately 37,000 U.S. women with advanced HR-positive breast cancer on aromatase inhibitors could benefit. This marks the 29th companion diagnostic indication for Guardant360 CDx, which is covered by Medicare and commercial payers representing over 300 million covered lives.
Guardant Health IncFDA approval of Guardant360 CDx as companion diagnostic for ETCAMAH expands its approved indications and market access.
AstraZeneca PLCFDA approval supports use of ETCAMAH in ESR1-mutant breast cancer, potentially increasing drug adoption.