Table 6.

Predictive value of serum carcinoembryonic antigen and alpha-fetoprotein for postoperative recurrence of gastric cancer

Variable	AUC	95%CI	Youden index	P value	Specificity (%)	Sensitivity (%)
CEA	0.702	0.608-0.783	0.55	0.001	68.11	81.09
AFP	0.688	0.514-0.732	0.62	0.001	45.20	80.52
Combination of the two	0.826	0.702-0.878	0.69	0.001	94.36	90.50

CEA: Carcinoembryonic antigen; AFP: Alpha-fetoprotein; 95%CI: 95% confidence interval; AUC: Areas under the receiver operating characteristic curve.