Biotechnology The US Food and Drug Administration (FDA) has granted traditional approval to Merck & Co’s Keytruda (pembrolizumab) with trastuzumab, fluoropyrimidine and platinum-containing chemotherapy for the first-line treatment of adults with locally advanced unresectable or metastatic HER2-positive gastric or gastroesophageal junction (GEJ) adenocarcinoma whose tumors express PD-L1 (CPS ≥1). 20 March 2025