Table 3. Receiver operating characteristic curve analyses showing the utility of alone or combined markers for differentiating of controls and gastric cancer.

Marker	Sensitivity	Specificity	PPV	NPV	AUC
CEA (ng/ml)	0.773	0.876	0.867	0.786	0.827 (0.785-0.863)
MPV (fL)	0.722	0.827	0.814	0.739	0.809 (0.766-0.848)
PDW (%)	0.717	0.849	0.832	0.741	0.863 (0.824-0.896)
CEA+MPV	0.820	0.838	0.841	0.816	0.889 (0.854-0.919)
CEA+PDW	0.835	0.908	0.905	0.840	0.939 (0.910-0.961)

Abbreviations: PPV, positive predictive value; NPV, negative predictive value; AUC, area under curve; CEA, carcinoembryonic antigen; MPV, mean platelet volume; PDW, platelet distribution width.