Carcinoid TumorMalignant Carcinoid SyndromeCarcinoid Heart DiseaseIleal NeoplasmsBronchial NeoplasmsAppendiceal NeoplasmsGastrointestinal NeoplasmsHydroxyindoleacetic AcidIntestinal NeoplasmsChromograninsOctreotideNeuroendocrine TumorsChromogranin AACTH Syndrome, EctopicDuodenal NeoplasmsThymus NeoplasmsTumor Markers, BiologicalParaneoplastic Endocrine SyndromesProctoscopyCarcinoma, NeuroendocrineCommon Bile Duct NeoplasmsEnterochromaffin CellsLiver NeoplasmsLung Neoplasms3-IodobenzylguanidineAmpulla of VaterEndocrine Gland NeoplasmsSomatostatinReceptors, SomatostatinIndium RadioisotopesCell Line, TumorAppendixJejunal NeoplasmsCushing SyndromeTomography, X-Ray ComputedTumor BurdenGastrinsDuodenoscopyTumor Necrosis Factor-alphaStomach NeoplasmsParaganglioma, Extra-AdrenalNeoplasm MetastasisPolypsNeoplasms, Multiple PrimaryTreatment OutcomeEar NeoplasmsImmunohistochemistryAppendectomyFlushingDigestive System NeoplasmsPancreatic NeoplasmsSynaptophysinEnterochromaffin-like CellsRetrospective StudiesPhosphopyruvate HydrataseRectal NeoplasmsAdenocarcinomaIodobenzenesMultiple Endocrine Neoplasia Type 1SerotoninApudomaMeckel DiverticulumAdenoma, Islet CellWilms TumorRectal ProlapseGlomus TumorTime FactorsOrbital NeoplasmsMuridae