Simple cholangitis induces extremely and recurrently elevated serum carbohydrate antigen 19-9 level

摘要

To the Editor: The carbohydrate antigen 19-9 (CA19-9) is a tumor maker which is usually used in biliary and pancreatic malignancies [1]. However, the specificity of CA19-9 can be reduced by biliary inflammation and other benign diseases [2].