Fig. 2　Hepatobiliary enzyme profiles of the distal bile duct patients at the first visit to the medical institute

（a） In non-icteric patients, GGT increased more frequently than other enzymes, such as AST, ALT, LDH and ALP. （b） In icteric patients, the majority of the hepatobiliary enzymes showed abnormal levels, including serum total bilirubin.
GGT gamma-glutamyltransferase, AST aspartate aminotransferase, ALT alanine aminotransferase, LDH lactate dehydrogenase, ALP alkaline phosphatase.