Gastrointestinal (GI) cancers include cancer of the esophagus, stomach, small intestine, colon, rectum, and anus as well as cancers of the liver, pancreas, gallbladder, and biliary system.
Colon cancer is cancer that starts in the large intestine (colon) or the rectum (end of the colon. Such cancer is sometimes referred to as "colorectal cancer.
Bile duct cancer, or cholangiocarcinoma, is a malignant tumor of the bile ducts within the liver (intrahepatic), or leading from the liver to the small intestine (extrahepatic).
Esophageal cancer is a malignant (cancerous) tumor of the esophagus, the muscular tube that moves food from the mouth to the stomach. See also: Barrett's esophagus