09/22/2026
The FDA has approved a new treatment for advanced breast cancer.
On September 4, 2026, the U.S. Food and Drug Administration (FDA) granted accelerated approval to camizestrant, marketed as Etcamah, marking a monumental shift in how advanced breast cancers are treated.
Developed by AstraZeneca, this new daily pill is the first cancer therapy of its kind to be guided by a companion blood test that detects tumor resistance before traditional imaging scans show any signs of disease progression.
It is designed specifically for adults with hormone receptor (HR)-positive, HER2-negative advanced or metastatic breast cancers who have developed a genetic mutation known as ESR1. This mutation commonly arises during standard hormone-blocking therapies, allowing tumors to evolve and continue growing even when their estrogen supply is cut off.
To qualify for the drug, patients must take the newly authorized Guardant360 CDx blood test, which identifies the ESR1 mutation by analyzing tiny fragments of tumor DNA circulating in the bloodstream. In a landmark clinical trial, patients who switched to Etcamah in combination with standard cancer therapies went a median of 16 months without their disease worsening, compared to just 9.2 months for those who remained on standard hormone treatments.
While the FDA's accelerated approval requires further confirmatory studies to verify its full clinical benefits, this breakthrough offers a vital new weapon against drug-resistant tumors, giving patients more valuable time and a highly personalized path forward.
source: U.S. Food and Drug Administration. (2026). FDA Grants Accelerated Approval to a New Breast Cancer Treatment.