Age, BMI, HGB, Serum ALB, Serum CEA, CONUT score, tumor size, pT stage, pN stage, nerve invasion, vascular invasion, tumor differentiation, and postoperative chemotherapy were the factors that influenced the prognosis of GC, according to the Cox's univariate analysis (P < 0.05 for all). This evidence concerns the gene CEACAM5 and gastric cancer.