Efficacy of EUS-guided and ERCP-guided biliary drainage for malignant biliary obstruction: prospective randomized controlled study

Background and Aims: ERCP-guided biliary drainage (ERCP-BD) is a criterion standard treatment for malignant biliary obstruction when curative surgery is not an option. Alternative methods such as percutaneous transhepatic biliary drainage would significantly lower the quality of life. EUS-guided biliary drainage (EUS-BD) has been developed and performed by experienced endoscopists. Therefore, the aims of this study were to evaluate the efficacy and safety of EUS-BD compared with ERCP in malignant biliary obstruction. Methods: The prospective randomized controlled study was conducted, and 30 patients were enrolled: 15 for each EUS-BD and ERCP-BD arms. The technical success, procedural time, clinical success, and adverse events were evaluated. Results: Thirty patients had extrahepatic malignant biliary tract obstruction (19 men, 11 women). Twenty-seven patients had unresectable pancreatic ductal adenocarcinomas, 1 patient had distal common bile duct cancer, and 2 patients had metastatic malignant lymphadenopathy. There were no significant differences both in terms of technical success rate and clinical success rate (100% vs 93% and 93% vs 100% in ERCP-BD vs EUS-BD, respectively; P=1.00, P=1.00). Four patients (31%) had tumor ingrowth-caused stent dysfunction in the ERCP-BD group, whereas 2 patients had food impaction and 2 patients had stent migration in the EUS-BD group. No significant procedure-related adverse events occurred in either group. Conclusions: This prospective randomized controlled study suggests that EUS-BD has similar safety to ERCP-BD. EUS-BD was not superior to ERCP-BD in terms of relief of malignant biliary obstruction. EUS-BD may have fewer cases of tumor ingrowth but may also have more cases of food impaction or stent migration. (Clinical trial registration number: NCT01421836.)