Introduction -- Historical Background -- Epidemiology -- Pathological Classification -- Carcinoid Syndrome -- Molecular Biology -- İnsulinoma -- Gastrinoma -- Vipoma -- Glucagonoma -- Pathological Evaluation -- Radiological Imaging -- Nuclear Imaging -- Genetic  Syndromes Associated with NET -- Surgical Approach -- Locoregional treatment (RFA) -- Embolization (Chemo/radio) -- PRRT -- Management of Hormonal symptoms -- Chemotherapy -- Somatostatin Analogues -- Targeted Therapies -- Guidelines -- Societies and Guidelines -- Biomarkers -- Medullary Thyroid Cancer -- Adrenocortical Cancer -- Paraganglioma, feokromositoma -- Nonfonksiyone pNET -- Somatostatinoma -- Poorly differentiated NET -- Management of MEN -- Ppoma.