AFP and gastric cancer: The ROC curves of serum CA125, AFP, CEA, and their combined detection for diagnosing gastric cancer were respectively plotted, and the AUCs were 0.815 (95% CI=0.758-0.871, P<0.001), 0.813 (95% CI=0.746-0.880, P<0.001), 0.911 (95% CI=0.863-0.959, P<0.001), and 0.919 (95% CI=0.873-0.965, P<0.001), respectively (Table 2, Figure 2).