Malignant Carcinoid SyndromeCarcinoid TumorCarcinoid Heart DiseaseHydroxyindoleacetic AcidIleal NeoplasmsOctreotideIntestinal Neoplasms3-IodobenzylguanidineFlushingNeuroendocrine TumorsLiver NeoplasmsSyndromeGastrointestinal NeoplasmsSomatostatinHepatic ArterySerotoninDiarrheaDelayed-Action PreparationsAntineoplastic Agents, Hormonal