Neuroendocrine tumors (NETs) represent a heterogeneous group of neoplasms with diverse biological and clinical behavior, and gastroenteropancreatic neuroendocrine tumors (GEP-NETs) are the most common subtype. This review provides an overview of GEP-NETs, with a focus on incidence trends, pathologic classification, diagnostic strategies, therapeutic advances, and the role of endoscopy in diagnosis and management of GEP-NETs. Incidence rates of GEP-NETs have significantly increased over recent decades, largely due to improved diagnostic modalities and increased use of endoscopy, although environmental factors may be at play as well.
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