Intraductal Radiofrequency Thermoablation and Radiotherapy Combined Treatment for Extrahepatic Cholangiocarcinoma

This study is testing a combination treatment for bile duct cancer (specifically the ducts outside the liver) that cannot be removed by surgery. The treatment uses heat-based ablation delivered through a scope, combined with radiation therapy, to try to shrink or control the cancer. **You may be eligible if...** - You are 20 years or older - You have been diagnosed with inoperable bile duct cancer outside the liver, confirmed by a lab test - You are willing to participate and can sign a consent form **You may NOT be eligible if...** - You refuse to sign informed consent - Your cancer has spread to other parts of the body (stage IV) or you have fluid buildup in the abdomen - Your cancer is inside the liver (intrahepatic) - You cannot safely undergo an endoscopic (scope) procedure - Your life expectancy is 3 months or less - You have a pacemaker, are pregnant, or have uncontrolled bleeding problems Talk to your doctor to see if this trial is right for you.