Prognostic value of preoperative serum tumor markers in gastric cancer

Table 4 Univariate model for disease-free survival and overall survival by log-rank test when considering the adjuvant chemotherapy

Tumor	DFS (P)		OS (P)
markers	Adjuvant chemotherapy	Non-adjuvant chemotherapy	Adjuvant chemotherapy	Non-adjuvant chemotherapy
CEA (+)	0.878	0.116	0.297	0.017
CA19-9 (+)	0.961	0.116	0.179	< 0.001
CA50 (+)	0.828	0.182	0.069	0.001
CEA (+) and CA19-9 (+)	0.961	0.116	0.304	0.004
CA50 (+) and CEA (+)	0.991	0.132	0.383	0.065
CA19-9 (+) and CA50 (+)	0.991	0.132	0.303	< 0.001
CEA (+) and CA19-9 (+) and CA50 (+)	0.991	0.132	0.867	0.298
CEA (+) or CA19-9 (+) or CA50 (+)	0.742	0.196	0.107	< 0.001

CEA: Carcinoembryonic antigen; CA: Carbohydrate antigen; DFS: Disease-free survival; OS: Overall survival.