Triple-Negative Breast Cancer Was the Diagnosis Women Feared Most. A New Drug Is Changing That.
Triple-negative breast cancer has no estrogen receptors, no progesterone receptors, and no HER2 amplification — the three main targets used to treat other breast cancers. For decades, chemotherapy was the only systemic option, and outcomes for high-risk early disease were poor. The KEYNOTE-522 trial, published in the New England Journal of Medicine in 2022, changed that picture: pembrolizumab plus chemotherapy improved 3-year event-free survival from 76.8% to 84.5% and is now the standard of care worldwide. Here is the full story, in plain English.