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ROC curves for the combination of serum CEA, CA125, and CA19-9 levels in the determination of cholangiocarcinoma resectability. For the combination of CEA and CA125, the AUC is 0.81; for the combination of CEA and CA19-9, the AUC is 0.75; for the combination of CEA, CA125 and CA19-9, the AUC is 0.74; and for the combination of CEA, CA125, and CA19-9, the AUC is 0.87.
