HCG18 and neoplasm: Chi‐square test indicated that high HCG18 expression in tumor tissues was intimately associated with increased tumor size (P = .0165), local lymph node IVS (P = .0065), distant MTS (P = .0084), and increased of T stage (P = .0041), but had no obvious link with patient's age, gender, and degree of differentiation (P > .05), revealing that HCG18 may promote GC development.