In this study, IHC analysis according to standardized scoring criteria was used to assess the incidence of HER2-positivity in primary resected GC and GEJ cancer samples in a C9pt?>The relationship between HER2 overexpression and gene amplification was also examined in GC and GEJ adenocarcinoma. Here, ERBB2 is linked to gastroesophageal junction adenocarcinoma.