A neuroendocrine tumor
(NET) begins within the specialized cells
of the body’s neuroendocrine
system. These cells
have traits of both hormone-producing endocrine cells
and nerve cells. They're found throughout the body’s organs and help control many of the body’s functions. Hormones
are chemical substances that are carried through the bloodstream to possess a selected effect on the activity of other organs or cells
within the body. All NETs are considered malignant tumors. Most NETs take years to develop and grow slowly. However, some NETs are often fast-growing. See the Grades section to find out more.
NETs can begin in any a part of the body, including the:
Lung: The lung
is that the second commonest location of NETs. About 30% of NETs occur within the bronchial system, which carries air to the lungs. Lung
NETs wont to be called carcinoid tumors. Learn more about NET of the lung.
Gastrointestinal (GI) tract: NETs develop most ordinarily within the alimentary canal, specifically within the intestine (19%), appendix (4%), and enormous intestine (20%). The alimentary canal plays a central role in digesting foods and liquid and in processing waste. alimentary canal NETs also wont to be called carcinoid tumors. Learn more about NET of the alimentary canal.
Pancreas: Approximately 7% of NETs can develop within the pancreas, a pear-shaped gland located within the abdomen between the stomach and therefore the spine. Pancreas NETs won’t to be called islet cell tumors. Learn more about NET of the pancreas.
NETs also can begin in other organs. In about 15% of cases, a primary site can't be found. Sometimes, NETs may develop in or on the adrenal glands. These rare sorts of NETs are called pheochromocytoma and paraganglioma, and that they are discussed in another section of this website. Other sorts of tumors that begin in hormone-producing cells
also are described in their own sections on Cancer.Net, including thyroid cancer, adrenal tumors, and pituitary tumors.
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