Neuroendocrine TumorsCarcinoma, NeuroendocrinePancreatic NeoplasmsCarcinoid TumorChromogranin AGastrointestinal NeoplasmsLIM-Homeodomain ProteinsTumor Markers, BiologicalNeurosecretory SystemsNeoplasm ProteinsNeuroendocrine CellsChromograninsNeuroendocrine Secretory Protein 7B2NeoplasmsSynaptophysinNeoplasms, Cystic, Mucinous, and SerousOctreotideImmunohistochemistryLung NeoplasmsNeoplasms, Multiple PrimaryIntestinal NeoplasmsEndocrine Gland NeoplasmsDigestive System NeoplasmsSkin NeoplasmsReceptors, SomatostatinCarcinoma, Large CellIleal NeoplasmsLiver NeoplasmsHypothalamo-Hypophyseal SystemThyroid NeoplasmsHypothalamusNeoplasms, Complex and MixedSomatostatinAdenocarcinoma, MucinousChromogranin BCarcinoma, Small CellBronchial NeoplasmsKidney NeoplasmsNeoplasms, Second PrimaryNervous System NeoplasmsAppendiceal Neoplasms