Bile Duct Cancer (Cholangiocarcinoma), from the CureRays guide library.

Bile duct cancer (cholangiocarcinoma) arises in the tubes that carry bile from the liver; treatment depends on where it forms, and radiation plays an important role in controlling tumors that cannot be removed.

What it is.

Bile duct cancer, also called cholangiocarcinoma, is a cancer that begins in the bile ducts — the thin tubes that carry bile, a digestive fluid, from the liver and gallbladder to the small intestine. It is an uncommon cancer that is grouped by where along this tubing system it forms, because the location strongly shapes symptoms and treatment. Cancers inside the liver are called intrahepatic; those at the point where the ducts leave the liver are called perihilar (or Klatskin tumors); and those in the duct closer to the intestine are called distal. A very common early sign is painless yellowing of the skin and eyes (jaundice), because a tumor blocks the flow of bile; other signs include itching, dark urine, pale stools, weight loss, and abdominal discomfort. Risk factors include chronic inflammation of the bile ducts, certain liver diseases, and bile duct stones. When the cancer can be removed with surgery, that offers the best chance of cure; when it cannot — which is common because these tumors are often found late or sit in difficult locations — treatment relies on chemotherapy, radiation, procedures to relieve bile blockage, and increasingly, targeted drugs matched to the tumor's genetics. Care is best delivered by an experienced multidisciplinary team.

How radiation treats it.

Radiation uses focused high-energy beams to damage the DNA inside cancer cells so they can no longer grow and divide. In bile duct cancer, radiation is especially valuable when a tumor cannot be removed with surgery — which is common, because these cancers often sit in difficult locations or are found late. Radiation can control a tumor that has grown into nearby blood vessels or structures, relieve symptoms such as pain or blockage of the bile duct, and, for selected tumors inside the liver, deliver a high focused dose to destroy the cancer. Modern techniques make this precise and safe: stereotactic body radiation therapy (SBRT) delivers a powerful dose in just a few sessions while sparing the surrounding liver; IMRT shapes the dose around the tumor while protecting the liver, intestine, and kidneys; and specialized internal radiation can concentrate the dose within the liver. Radiation is often combined with chemotherapy to improve control of locally advanced disease, and it can be used after surgery in selected cases. Because the liver and nearby organs are sensitive, the radiation oncologist carefully plans the dose and uses techniques that account for breathing motion. Your team will tailor radiation to your tumor's location and goals — whether controlling an unremovable cancer or relieving symptoms — while protecting healthy liver and digestive organs.

The ways we can treat it.

Stereotactic body radiation therapy (SBRT). SBRT delivers a high, precisely focused radiation dose to a bile duct or liver tumor in a few sessions, controlling cancers that cannot be removed while sparing surrounding liver tissue.

Chemoradiation. Combining radiation with chemotherapy can improve control of locally advanced tumors that have grown into nearby structures and cannot be removed surgically.

External-beam radiation (IMRT). Intensity-modulated radiation shapes the dose around the tumor while sparing the liver, intestine, and kidneys, and can relieve symptoms such as pain or duct blockage.

Internal and liver-directed radiation. For selected intrahepatic tumors, radiation delivered from inside the duct (brachytherapy) or tiny radioactive beads placed in the tumor's blood supply can concentrate dose within the liver.

Questions we hear often.

Why does the location of the tumor matter so much? Bile duct cancers are grouped by where they form — inside the liver, at the liver's junction, or lower in the duct — because the location determines the symptoms, the type of surgery possible, and how radiation and other treatments are used. This is why staging and treatment plans differ by location.

What can be done if the cancer can't be removed with surgery? Many bile duct cancers can't be removed, but a lot can still be done: chemotherapy and radiation (including focused high-dose SBRT for some liver tumors) can control the cancer and relieve symptoms, procedures can open a blocked bile duct, and targeted drugs may help if the tumor has certain gene changes. Clinical trials are also worth discussing.

Should my tumor's genetics be tested? Yes — some bile duct cancers carry specific gene changes, such as FGFR2 fusions or IDH1 mutations, that can be treated with targeted drugs. Testing the tumor's genetics, particularly in advanced disease, can open up additional treatment options.

This guide is informational only. It is not medical advice — please confirm anything here with your care team.