Carcinoid TumorMalignant Carcinoid SyndromeCarcinoid Heart DiseaseIleal NeoplasmsGastrointestinal TractAppendiceal NeoplasmsBronchial NeoplasmsGastrointestinal NeoplasmsHydroxyindoleacetic AcidIntestinal NeoplasmsDigestive SystemChromograninsNeuroendocrine TumorsOctreotideChromogranin AACTH Syndrome, EctopicDuodenal NeoplasmsThymus NeoplasmsTumor Markers, BiologicalDigestive System Physiological PhenomenaUpper Gastrointestinal TractParaneoplastic Endocrine SyndromesProctoscopyCarcinoma, NeuroendocrineEnterochromaffin CellsCommon Bile Duct NeoplasmsAmpulla of VaterSomatostatinLiver NeoplasmsJejunal NeoplasmsStomach NeoplasmsAppendixReceptors, SomatostatinLung NeoplasmsImmunohistochemistryGastrins3-IodobenzylguanidineEndocrine Gland NeoplasmsCell Line, TumorIndium RadioisotopesDigestive System NeoplasmsTomography, X-Ray ComputedDuodenoscopyPolypsCushing SyndromeGastrointestinal DiseasesNeoplasms, Multiple PrimaryTumor BurdenTumor Necrosis Factor-alphaNeoplasm MetastasisIntestine, SmallPancreatic NeoplasmsAdenocarcinomaParaganglioma, Extra-AdrenalLower Gastrointestinal TractEar NeoplasmsAppendectomyRectal NeoplasmsMeckel DiverticulumStomachFlushingSynaptophysinEnterochromaffin-like CellsRetrospective StudiesSerotoninPhosphopyruvate HydrataseTreatment OutcomeIodobenzenesMultiple Endocrine Neoplasia Type 1Intestinal MucosaApudomaAdenoma, Islet CellIleumTime FactorsWilms TumorGastrointestinal Stromal TumorsMuridaeGlomus TumorRectal Prolapse