Carcinoid TumorNeuroendocrine TumorsMalignant Carcinoid SyndromeCarcinoma, NeuroendocrineCarcinoid Heart DiseaseIleal NeoplasmsGastrointestinal NeoplasmsOctreotideChromogranin ABronchial NeoplasmsChromograninsIntestinal NeoplasmsAppendiceal NeoplasmsPancreatic NeoplasmsReceptors, SomatostatinNeurosecretory SystemsDigestive System NeoplasmsTumor Markers, BiologicalSomatostatinNeuroendocrine CellsHydroxyindoleacetic AcidDuodenal NeoplasmsEndocrine Gland NeoplasmsACTH Syndrome, EctopicThymus NeoplasmsTumor BurdenCell Line, TumorIndium RadioisotopesLiver NeoplasmsLung Neoplasms3-IodobenzylguanidineVipomaImmunohistochemistryRadiopharmaceuticalsCommon Bile Duct NeoplasmsMultiple Endocrine Neoplasia Type 1Tomography, X-Ray ComputedSynaptophysinApudomaTumor Necrosis Factor-alphaGastrinomaGlucagonomaParaganglioma, Extra-AdrenalNeoplasm MetastasisPheochromocytomaAmpulla of VaterStomach NeoplasmsCarcinoma, Islet CellCarcinoma, Small CellParagangliomaTreatment OutcomePentetic AcidPhosphopyruvate HydrataseJejunal NeoplasmsDuodenoscopyAdenocarcinomaNeoplasms, Multiple PrimaryRetrospective StudiesParaneoplastic Endocrine SyndromesAdenoma, Islet CellGastrinsWilms TumorPositron-Emission TomographyZollinger-Ellison SyndromeNeoplasm StagingCushing SyndromeEnterochromaffin CellsOrganometallic CompoundsSomatostatinomaInsulinomaNeoplasms, ExperimentalGenes, Tumor SuppressorTumor Suppressor Protein p53Adrenal Gland NeoplasmsProctoscopyCell ProliferationLutetiumPrognosisFlushingKi-67 AntigenYttrium RadioisotopesPancreaticoduodenectomyNeuroectodermal TumorsRectal NeoplasmsAntineoplastic AgentsTumor Suppressor ProteinsLymphatic MetastasisIodobenzenesTime FactorsAppendixAntineoplastic Agents, HormonalBrain NeoplasmsNeovascularization, PathologicDNA, NeoplasmImmunoenzyme TechniquesRNA, MessengerGallium RadioisotopesTumor MicroenvironmentEar NeoplasmsCarcinoma, Large Cell