Figure 1.

The differences of patient survival time according to several factors. Kaplan-Meier curves show: (A) A longer survival time following percutaneous transhepatic biliary drainage in patients of <70 years old; (B) A similar trend was observed in patients with serum bilirubin levels <68.4 μmol/l; (C) Patients receiving subsequent therapies, for example sugery, chemotherapy and other local types, demonstrated greater cumulative survival rates. Differences from curves were tested by the log-rank test and multivariate analysis was performed by Cox’s regression analysis.