title: Percutaneous transhepatic and endoscopic biliary drainage for malignant biliary tract obstruction: a meta-analysis.
abstract: Various malignant tumors can obstruct the extrahepatic biliary tract. Two major techniques for restoring bile flow in this circumstance are endoscopic biliary drainage (EBD) and percutaneous transhepatic biliary drainage (PTBD).We conducted a meta-analysis to compare the effectiveness and safety of the two techniques.
  
  
  
  Medline, EMBASE and the Cochrane Library database were searched for articles published between January 1980 and December 2013. The outcome measures were therapeutic success rate (primary), 30-day mortality rate and overall complications.
  
  
  
  Of 264 screened articles, 3 randomized controlled trialscomprising an aggregate total of 183 cancer patients were included in the meta-analysis. Our analysis showed no significant difference in restoration of bile flow between patients treated with EBD and those treated with PTBD (odds ratio (OR) = 2.34, 95% confidence interval (CI) = 0.32 to 17.16, P = 0.401).However, the result of sensitivity analysis indicated that the study conducted by Speer et al. influenced the pooled estimates. After the Speer et al. study was excluded, the therapeutic success rate of patients treated with PTBD was significantly greater than that of those who underwent EBD (OR = 5.48, 95% CI: 2.26 to 13.28, P < 0.001). The 30-day mortality and complication rates were similar in the EBD and PTBD groups.
  
  
  
  The results of our meta-analysis indicate that PTBD had a higher therapeutic success rate than EBD in the treatment of malignancy-induced biliary obstruction. The mortality and complication rates of the two techniques were similar.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Leng
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
authors.forename: Jia-Hong
authors.initials: JH
authors.lastname: Dong