Dear Chhaya, If cancer has spread and cannot be removed, the following types of palliative surgery may relieve symptoms:

1. Biliary bypass: If the tumor is blocking the bile duct and bile is building up in the gallbladder, a biliary bypass may be done. During this operation, the doctor will cut the gallbladder or bile duct in the area before the blockage and sew it to the small intestine to create a new pathway around the blocked area.
2. Endoscopic stent placement: If the tumor is blocking the bile duct, surgery may be done to put in a stent (a thin tube) to drain bile that has built up in the area. The doctor may place the stent through a catheter which is a soft hollow tube which is passed into the bladder that drains the bile into a bag on the outside of the body or the stent may go around the blocked area and drain the bile into the small intestine.
3. Percutaneous transhepatic biliary drainage: A procedure done to drain bile when there is a blockage and endoscopic stent placement is not possible. An x-ray of the liver and bile ducts is done to locate the blockage. Images made by ultrasound are used to guide placement of a stent, which is left in the liver to drain bile into the small intestine or a collection bag outside the body. This procedure may be done to relieve jaundice before surgery.
    

And for further details on bile duct cancer treatment, you can click the link given below: https://www.cancer.net/cancer-types/gallbladder-cancer/types-treatment
Hope this information helps you. You can also get second opinions from experts by referring our page - Best Oncologist In India.