Neuroendocrine tumours of the digestive tract are rare neoplasms deriving from the neuroendocrine cells spread along the digestive tract from the oesophagus to the rectum. This books aims to summarize the current knowledge about the origin and hormones of neuroendocrine cells in the digestive tract and the current staging- and grading systems for neuroendocrine tumours. Data on the incidence of gastroenteropancreatic neuroendocrine tumors (GEP-NETs) have so far only been obtained retrospectively and are based on inhomogeneous material. So the research part of this book presents a prospective...