?:abstract
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The term neuroendocrine neoplasms (NEN) encompasses a molecularly and biologically very heterogeneous group of tumors, which have in common their origin in neuroendocrine cells The also very heterogeneous subgroup of gastroenteropancreatic neuroendocrine neoplasms (GEP-NEN) is the best classified and investigated group This article provides a systematic review of the current classification, diagnostics and treatment options of GEP-NEN In order to achieve a better overview, it was consciously decided not to use an approach based on the primary localization Instead, a thematic organization according to classification, clinical phenotype, diagnostics and treatment was chosen
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