Table 4. Receiver operating characteristic curve analyses showing the utility of alone or combined markers for differentiating of gastric ulcer and gastric cancer.

Marker	Sensitivity	Specificity	PPV	NPV	AUC
CEA (ng/ml)	0.655	0.712	0.698	0.670	0.692 (0.643-0.737)
MPV (fL)	0.856	0.754	0.779	0.837	0.853 (0.813-0.887)
PDW (%)	0.985	0.974	0.974	0.984	0.990 (0.975-0.998)
CEA+MPV	0.851	0.770	0.789	0.835	0.876 (0.839-0.907)
CEA+PDW	0.990	0.979	0.980	0.989	0.996 (0.984-1.000)

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