ERBB2 and gastric adenocarcinoma: For ongoing clinical trials, we searched in the clinicaltrials.gov database for recruiting and active, not recruiting trials, using the following keywords: “gastric cancer” OR “gastric adenocarcinoma” OR “gastroesophageal cancer” AND “HER2” OR “human epidermal growth factor receptor” OR “trastuzumab” OR “trastuzumab deruxtecan” OR “margetuximab” OR “ZW25” OR “trastuzumab emtansine”.