The Neuroendocrine Cancer. Personal Comments and Operational Remarks

Indroduction: Neuroendocrine tumors (NEN) of the gastro-entero-pancreatic tract (GEP) are a group in themselves very heterogeneous of tumors that are different for the site of localization in the digestive tract (foregut, midgut and hindgut), both in relation to the pathological aspects, functional activity and nosographic classification.