Figure 4.
Receiver operating characteristics (ROC) curve and ROC characteristics as defined by area under the curve (AUC) for volatile organic compounds and the logistic regression model for differentiation of cholangiocarcinoma from primary sclerosing cholangitis. A value < −0.12 identified the patients with CCA [AUC=0.89], with 90.5% sensitivity and 72.7% specificity.