[Biopathological characteristics of hilar cholangiocarcinoma and the clinical significance].

Objective: To approach the biopathological features of hilar cholangiocarcinoma and surgical pathological factors which influence the long-term survivals of patients with hilar cholangiocarcinoma.

Methods: A systemic and retrospective multi-parameter analysis was performed on 205 patients of hilar cholangiocarcinoma who received surgical treatments and had complete clinicopathological data as well as follow-up results during a ten-year-period from April 1998 to April 2008. The single factor analysis was performed on age, sex, content of pre-operative serum CA19-9, Child-pugh grading, TNM classification, operation pattern, resection margin status of bile duct, vascular invasion, adjacent liver involvement, grade differentiation, infiltration-depth of bile duct, lymph node metastasis and perineural infiltration. A multivariate analysis was performed through Cox proportional hazard model.

Results: The single factor analysis showed that except age, sex and content of pre-operative serum CA19-9, the mainly significant factors influencing the survivals were Child-Pugh grading, TNM classification, operation pattern, bile duct margin, vascular invasion, adjacent liver involvement, grade differentiation, infiltrating-depth of bile duct, lymph node metastasis and perineural infiltration (P < 0.05). Lymph node metastasis and infiltration-depth of bile duct wall were found to be the two independent factors influencing overall survival by multivariate analysis through the Cox model.

Conclusions: The most important prognostic factors influencing the long-term survivals of patients with hilar cholangiocarcinoma after operation are lymph node metastasis and depth of tumor-infiltrating of involved bile duct. During the operation, standardized evaluation through frozen section should be carried out for detection of lymph node metastasis and depth of tumor-infiltrating of involved bile ducts, which can be used as the histological indicator for surgical expansion, and could be helpful to maximize avoiding the tumor cell residues and therefore, to improve the long-term effects of surgical resection.