Keytruda (pembrolizumab)

Gastric or gastroesophageal junction (GEJ) adenocarcinoma in adult patients, locally advanced unresectable or metastatic, HER2‑positive, first-line treatment in combination with trastuzumab, fluoropyrimidine- and platinum-containing chemotherapy, whose tumors express PD-L1 [Combined Positive Score (CPS) ≥1] as determined by a validated test