A gastrointestinal carcinoid tumor is cancer that forms in the lining of the gastrointestinal tract.
The gastrointestinal (GI) tract is part of the body's digestive system. It helps to digest food, takes nutrients (vitamins, minerals, carbohydrates, fats, proteins, and water) from food to be used by the body and helps pass waste material out of the body. The GI tract is made up of these and other organs:
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Gastrointestinal carcinoid tumors form in the lining of the gastrointestinal tract, most often in the appendix, small intestine, or rectum.
Gastrointestinal carcinoid tumors form from a certain type of neuroendocrine cell (a type of cell that is like a nerve cell and a hormone -making cell). These cells are scattered throughout the chest and abdomen but most are found in the GI tract. Neuroendocrine cells make hormones that help control digestive juices and the muscles used in moving food through the stomach and intestines. A GI carcinoid tumor may also make hormones and release them into the body.
GI carcinoid tumors are rare and most grow very slowly. Most of them occur in the appendix, small intestine, and rectum. Sometimes more than one tumor will form.
See the following PDQ summaries for more information related to GI and other types of carcinoid tumors:
Health history can affect the risk of gastrointestinal carcinoid tumors.
Anything that increases a person's chance of developing a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk to your doctor if you think you may be at risk.
Risk factors for GI carcinoid tumors include the following:
Having a family history of multiple endocrine neoplasia type 1 (MEN1) syndrome or neurofibromatosis type 1 (NF1) syndrome.
Having certain conditions that affect the stomach's ability to make stomach acid, such as atrophic gastritis, pernicious anemia, or Zollinger-Ellison syndrome.