The diagnostic values of serum kininogen-1 and CEA for patients with colorectal tumors.

A: The ROC curve for serum kininogen-1 (a) and CEA (b) for a diagnosis of ACA, and the ROC curve for serum kininogen-1 (c) and CEA (d) for a diagnosis of CRC. B: A comparison of the sensitivity (Se), specificity (Sp), positive predictive value (Pv+), negative predictive value (Pv-), and accuracy (Ac) rates for detection of kininogen-1 and CEA for a diagnosis of Duke’s stage A and B CRC (a) or Duke’s stage C and D CRC (b).