More specifically – levels of CA19-9, carbohydrate antigen-S27 (CA-S27), CCA-associated carbohydrate antigen (CCA-CA), WFA-positive MUC1 (WFA+-MUC1), and WFA-positive M2BP (WFA+-M2BP) were measured in serum taken from 138 CCA patients and 246 non-CCA controls, showing a 80.4% sensitivity and 81.7% specificity (AUC = 0.873) (137). This evidence concerns the gene MUC1 and cholangiocarcinoma.