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Study design
EBV, Epstein-Barr virus; GEJ, gastroesophageal junction; HER-2, human epidermal growth factor receptor-2; H. pylori, Helicobacter pylori; IHC, immunohistochemistry; ISH, insitu hybridization; MSI, microsatellite instability; PCR, polymerase chain reaction; PD-L1, programmed death ligand-1.
