Efficacy and Safety of the Paclitaxel Eluting Covered Biliary Stent to the Common Covered Metallic Biliary Stent

Inclusion Criteria: * Patient who submitted a written informed consent for the this trial, and 18 \~ 90 years old * Patient who have pancreatic cancer and/or biliary cancer with mid or distal CBD invasion * Patient who is inoperable and/or unresectable cases of malignant pancreatic stenosis * Patient who is attempting of endoscopic biliary metallic stenting (by ERBD) firstly * Patient who have life expectancy at least longer than 3 months (Karnofsky score \>60%) Exclusion Criteria: * Patient who previously had surgical biliary drainage * Patient who carrying bleeding disorder * Patient who have combined Hilar and/or intra-hepatic duct cancer * Patient who is improper to endoscopic treatment