Abstract: Objective: To explore the expression of cyclin E in cholangiocarcinoma and investigate the relevance of cyclin E and several clinical factors with infiltration of nerve and prognosis. Methods: The S-P immunohistochemical staining method was used to determine the expression of cyclin E in 35 cases of cholangiocarcinoma tissues, 25 cases of normal bile duct tissues beside tumor and 11 cases of bile duct′s benign disease. Results: The positive expression rate of cyclin E in cholangiocarcinoma was higher than that in infiltration of surroundings（P＜0.01） and tissues of bile duct′s benign diseases（P＞0.05）. The positive expression of cyclin E was related to infiltration of nerve（P＜0.01）, but was not related to the size of tumor, pathologyic stage, infiltration and clinical TNM stage（P＞0.05）. The median survival time was significantly longer in patients negative for the cyclin E expression than that in those positive for the expression（P＜0.01）. Conclusions: The positive expression of cyclin E is related to infiltration of nerve. cyclin E may be one of markers to evaluate the prognosis of cholangiocarcinoma.

Key words: Bile duct neoplasms, Immunohistochemistry, Cyclin E, Prognosis