Bile Duct Cancer Stages

The stage of a cancer describes how much cancer is in the body. It helps determine how serious the cancer is and how best to treat it. Doctors also use a cancer's stage when talking about survival statistics.

The stage is determined by the results of the physical exam, imaging and other tests (described in How Is Bile Duct Cancer Diagnosed?), and by the results of surgery if it has been done.

The American Joint Committee on Cancer (AJCC) TNM system

A staging system is a standard way for the cancer care team to sum up the extent of a cancer. The main system used to describe the stages of bile duct cancer is the American Joint Committee on Cancer (AJCC) TNM system. There are actually 3 different staging systems for bile duct cancers, depending on where they start:

illustration showing the location of the common bile duct, intrahepatic bile ducts, perihilar bile ducts and distal bile ducts in relation to the liver, pancreas and duodenum (intestine)

No matter where they are, nearly all bile duct cancers start in the innermost layer of the wall of the bile duct (called the mucosa). Over time they can grow through the wall toward the outside of the bile duct. If a tumor grows through the bile duct wall, it can invade (grow into) nearby blood vessels, organs, or other structures. It might also enter the nearby lymphatic or blood vessels, from which it can spread to nearby lymph nodes or to other parts of the body.

The TNM system for all bile duct cancers is based on 3 key pieces of information:

  • T describes whether the main (primary) tumor has invaded through the wall of the bile duct and whether it has invaded other nearby organs or tissues.
  • N describes whether the cancer spread to nearby (regional) lymph nodes (bean-sized collections of immune system cells throughout the body).
  • M indicates whether the cancer has metastasized (spread) to other organs of the body. (The most common sites of bile duct cancer spread are the liver, peritoneum [the lining of the abdominal cavity], and the lungs.)

For more detailed staging information on a type of bile duct cancer, click on one of the links above.

The American Cancer Society medical and editorial content team
Our team is made up of doctors and master’s-prepared nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.

Last Medical Review: December 8, 2017 Last Revised: December 8, 2017

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