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. 2017 Mar 2;7:43536. doi: 10.1038/srep43536

Figure 3. Receiver operating characteristic (ROC) curve analyses for the use of PG I/II ratios (PGR, blue line), pepsinogen I (PG I, red line), CA 19-9 (green line) and CEA (dark line) as serum markers for gastric cancer.

Figure 3

The X axis shows 100 - specificity, while the Y axis displays sensitivity for PGR, PG I, CA 19-9 and CEA were 0.949, 0.858, 0.668 and 0.696, respectively. Serum PG test was better than serum CA 19-9 and CEA for use as a screening serum marker for gastric cancer.