Carcinoid TumorMalignant Carcinoid SyndromeCarcinoid Heart DiseaseIleal NeoplasmsBronchial NeoplasmsAppendiceal NeoplasmsHydroxyindoleacetic AcidGastrointestinal NeoplasmsOctreotideIntestinal NeoplasmsChromograninsNeuroendocrine TumorsChromogranin AACTH Syndrome, EctopicDuodenal NeoplasmsThymus NeoplasmsParaneoplastic Endocrine SyndromesCarcinoma, NeuroendocrineTumor Markers, BiologicalEnterochromaffin CellsProctoscopyCommon Bile Duct NeoplasmsSomatostatinReceptors, Somatostatin3-IodobenzylguanidineLiver NeoplasmsAppendixLung NeoplasmsIndium RadioisotopesAmpulla of VaterJejunal NeoplasmsCushing SyndromeGastrinsDuodenoscopyFlushingStomach NeoplasmsTomography, X-Ray ComputedCell Line, TumorPolypsNeoplasms, Multiple PrimaryParaganglioma, Extra-AdrenalSynaptophysinAppendectomyEndocrine Gland NeoplasmsNeoplasm MetastasisDigestive System NeoplasmsEar NeoplasmsPancreatic NeoplasmsEnterochromaffin-like CellsImmunohistochemistryPhosphopyruvate HydrataseTumor BurdenSerotoninMultiple Endocrine Neoplasia Type 1Rectal NeoplasmsApudomaIodobenzenesTumor Necrosis Factor-alphaAdenoma, Islet Cell