Carcinoid TumorMalignant Carcinoid SyndromeCarcinoid Heart DiseaseIleal NeoplasmsBronchial NeoplasmsAppendiceal NeoplasmsLungGastrointestinal NeoplasmsHydroxyindoleacetic AcidIntestinal NeoplasmsChromograninsOctreotideNeuroendocrine TumorsChromogranin ALung NeoplasmsACTH Syndrome, EctopicDuodenal NeoplasmsThymus NeoplasmsTumor Markers, BiologicalParaneoplastic Endocrine SyndromesLung DiseasesCarcinoma, NeuroendocrineProctoscopyCommon Bile Duct NeoplasmsCell Line, TumorEnterochromaffin CellsLiver Neoplasms3-IodobenzylguanidineReceptors, Somatostatin