Karol Maciejewski, Barbara Buchalska, Małgorzata Solnik, M. Fudalej, A. Deptała, A. Badowska-Kozakiewicz
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Gastroenteropancreatic neuroendocrine tumours – an overview
Neuroendocrine neoplasms (NENs) belong to a group of various tumours that can arise on many internal organs. Among NENs a large class of gastroenteropancreatic neuroendocrine tumours (GEP-NETs) can be distinguished, which comprise neoplasms arising from the gastrointestinal tract and pancreas. Therefore, this review provides the current status of the World Health Organization classification of GEP-NETs as well as an overview of their clinical presentation, diagnosis, and treatment methods. GEP-NETs are generally divided into 5 groups: pancreatic NETs (PanNETs), gastric NETs (G-NETs), duodenal NETs (D-NETs), jejunoileal NETs (Je-Ile NETs), and neuroendocrine neoplasms of the large intestine. Moreover, in each group several subtypes have been introduced according to cell differentiation, mitotic rate, and Ki-67 index. Low-and intermediate-grade GEP-NETs are well differentiated, have
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