Neuroendocrine Cancer starts in cells of the neuroendocrine system. This system is a network of cells throughout the body that have a structure similar to neurons (nerve cells) and produce hormones like endocrine cells.
Neuroendocrine tumours (NETs) are abnormal growths that develop very slowly. They are usually benign (non-cancerous) and can often be removed. There is a small chance that these benign tumours can become malignant (cancerous). Malignant neuroendocrine tumours can spread (metastasize) to other parts of the body. Tumours that start in the neuroendocrine system and spread to other parts of your body are called neuroendocrine carcinomas. NETs and neuroendocrine carcinomas occur most often in the digestive system.