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About Gastrointestinal Carcinoid Tumors

  • Gastrointestinal (GI) carcinoid tumors are slow-growing cancers that form in cells that make hormones in the lining of the stomach and intestines.

    Carcinoid tumors start from cells of the diffuse neuroendocrine system. This system consists of cells that are like nerve cells in certain ways and like hormone-making endocrine cells in other ways. These cells don’t form an actual organ like the adrenal or thyroid glands. Instead, they are scattered throughout other organs like the esophagus, stomach, pancreas, intestines, and lungs. The digestive system is large and has more neuroendocrine cells than any other part of the body. This might be why carcinoid tumors most often start in the digestive system.

    Learn about gastrointestinal carcinoid tumors and find information on how we support and care for people with gastrointestinal carcinoid tumors before, during, and after treatment.

    The following information is from the National Cancer Institute (NCI).

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