NCI Dictionary of Cancer Terms
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gastrointestinal carcinoid tumor (GAS-troh-in-TES-tih-nul KAR-sih-noyd TOO-mer)
An indolent (slow-growing) cancer that forms in cells that make hormones in the lining of the gastrointestinal tract (the stomach and intestines). It usually occurs in the appendix (a small fingerlike pouch of the large intestine), small intestine, or rectum. Having gastrointestinal carcinoid tumor increases the risk of forming other cancers of the digestive system.