About Neuroendocrine (Carcinoid) Tumors
A gastrointestinal carcinoid tumor is cancer that forms in the lining of the gastrointestinal tract. The gastrointestinal tract includes the stomach, small intestine, and large intestine. Gastrointestinal carcinoid tumors grow slowly. Gastrointestinal carcinoid tumors develop from a certain type of hormone -making cell in the lining of the gastrointestinal tract. These cells produce hormones that help regulate digestive juices and the muscles used in moving food through the stomach and intestines. A gastrointestinal carcinoid tumor may also produce hormones. Carcinoid tumors that start in the rectum usually do not produce hormones.
