Abstract

Gastroenteropancreatic neuroendocrine tumors (GEP-NETs) are rare and heterogeneous neoplasms with overall increasing incidence, but not an associated increase in survival rate over the past few decades. Tumors originate from at least 16 different cells of diffuse endocrine system (DES), scattered through mucosa of gastrointestinal tract. They are mainly sporadic, but sometimes exhibit familial inheritance. Tumors often preserve the ability to synthesize, store and secrete numerous hormones and biogenic amines which sometimes lead to distinct hypersecretory and clinically recognizable syndromes (such as carcinoid, Zollinger-Ellison, WDHA etc.).1 The resulting clinical symptoms are generally well controlled by somatostatin analogs and/or interferon-┙.2

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