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In this set of patients, entry criteria of surveillance need to be refined in the light of the suboptimal diagnostic accuracy of non invasive tests that are employed to identify the ideal candidates for surveillance. Malignant biliary obstruction (MBO) is usually caused by biliary tract cancer or pancreatic cancer. This study was performed to summarize the current situation regarding palliative endoscopic retrograde biliary drainage (ERBD) for MBO in Korea and to determine its clinical significance by analyzing representative nationwide