ERBB2 and gastric cancer: Further multivariate analyses found that HER2 positive (HR: 4.517; 95% CI: 1.303–15.657; P = 0.017) and tumor middle location (HR: 3.761; 95% CI: 1.086–13.033; P = 0.037) were significant independent factors for the prognoses of pT1N1 GC patients (Table 5).