ERBB2 and gastric cancer: Several studies have reported the correlation between prognosis and HER2/HER2 levels in East Asian population (Kataoka et al. 2013; Kim et al. 2019; Kurokawa et al. 2015; Shen et al. 2016); however, the prognostic value of HER2/HER2 levels in Western patients with resectable GC remain elusive.