Search Strategy
This meta-analysis was conducted based on the Preferred Reporting Items for Systematic Reviews and Meta‐Analyses (PRISMA) statement and the protocol has been registered in PROPERO (CRD42023454582). We systematically searched the PubMed, Embase, Web of Science, Cochrane Central Register of Controlled Trials (CENTRAL) and ClinicalTrials.gov databases from their inception dates to August 21, 2023. The main search terms used for retrieval were “gastric” OR “stomach” AND “cancer” AND “HER2-targeted antibody-drug conjugate”. In addition, the references cited in the included studies were checked to identify additional potentially relevant studies. The complete search strategy is provided in the Supplementary file.