Univariate analysis of patients with HER2-positive AGC identified that age (< 70 vs. ≥ 70 years), macroscopic type (type non-4 vs. type 4), peritoneal dissemination (P0 vs. P1), histological type (differentiated vs. undifferentiated), and tumor response (non-PD vs. PD) were significantly related to survival (p = 0.0207, p = 0.0116, p = 0.0117, p = 0.0020, and p = 0.0002, respectively; Table 3). This evidence concerns the gene ERBB2 and neoplasm.