Neuroendocrine tumors arise in specialized neuroendocrine cells. Neuroendocrine cells share characteristics with hormone-producing and nerve cells. Moreover, these tumors are an uncommon type of tumor that may form in various organs throughout the body. It affects the cells that secrete hormones into the circulation (neuroendocrine cells).
A neuroendocrine tumor comes in a variety of types. Some develop slowly, while others grow swiftly. Some neuroendocrine tumors secrete an overabundance of hormones (functional). Furthermore, others do not produce enough hormones to create symptoms (nonfunctional).