Clinical value of serum CA19-9 levels in evaluating resectability of pancreatic carcinoma

Figure 1 Distribution of preoperative serum CA19-9 levels. The horizon marker is set according to the cut-off point of CA19-9 (353.15 U/mL).

Figure 2 ROC analysis of CA19-9. Perfect discrimination has a ROC plot passing through the upper left corner (100% sensitivity, 100% specificity). The closer the ROC plot to the upper left corner, the higher the overall accuracy of the test (AUC: 0.9-1 indicating excellent; 0.8-0.9 indicating very good; 0.7-0.8 indicating good; 0.6-0.7 indicating average; 0.5-0.6 indicating poor). The AUC of CA19-9 was 0.918.