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INTRODUCTION
Bile leakage is a frequent complication after liver resection associated with the need of interventional drainage, endoscopic retrograde cholangio pancreatography (ERCP) or reoperation. The intraoperative application of the white test could be a promising strategy to reduce the occurrence of bile leakages. Therefore, we propose to conduct the first multicentric randomised controlled trial with rate of postoperative bile leakage as primary endpoint with and without the white test.

METHODS AND ANALYSIS
The Bile-Leakage Trial trial is an investigator-initiated randomised controlled, parallel group, double-blinded, multicentric, superiority trial in four Swiss centres. A total of 210 patients undergoing a resection of at least 2 liver segments will be randomly allocated intraoperatively to either the intervention (identification of open bile ducts with administration of 20-40 mL SMOFlipid5% in the bile tract) or the control group (identification with a white gauze on the liver resection surface).Primary outcome will be the comparison of the postoperative bile leakage rate in both groups within 30 days after liver resection, defined according to the classification of the International Study Group of Liver Surgery. Secondary outcomes will be operative and postoperative complication, including severity grade of the bile leakage, rate of ERCP, interventional drainage, morbidity, intensive care unit stay, and mortality.

ETHICS AND DISSEMINATION
The cantonal ethics committees of all participating centres and Swissmedic approved the study. SMOFlipid20% consists of a mixture of oils, no side effects resulting from the intraoperative application of 20-40 mL in the biliary tract with consecutive enteral absorption are expected nor are side effects described in the literature. SMOFlipid20% will be diluted intraoperatively with isotonic saline solution to a concentration of 5%. The results of the BiLe-Trial will be submitted to a peer-reviewed journal regardless of the outcome. As this is an investigator-initiated trial, data are property of the sponsor investigator and can be obtained on request.

TRIAL REGISTRATION NUMBER
Clinicaltrials.gov, ID: NCT04523701. Registered on 25 August 2020.Swiss National Clinical Trials Portal (SNCTP), ID: SNCTP000004200. Registered on 20 January 2021.

PROTOCOL VERSION
V3.2_14-12-2020_clean.pdf.