Advances in HER2-Positive Gastric and Gastroesophageal Cancer – Insights from KEYNOTE-811

Since 2009, trastuzumab combined with chemotherapy has been the standard of care for HER2-positive metastatic gastric (mGC) and gastroesophageal junction cancer (GEJ), based on findings from the phase 3 ToGA trial (1). However, despite this initial success, the following decade brought a series of negative phase 3 trials, leaving first-line treatment options for HER2-positive gastric and gastroesophageal cancers without significant advancements (2–5).