Carcinoid TumorNeuroendocrine TumorsCarcinoma, NeuroendocrineChromogranin AOctreotideGastrointestinal NeoplasmsPancreatic NeoplasmsNeurosecretory SystemsReceptors, SomatostatinNeuroendocrine CellsDigestive System NeoplasmsChromograninsIntestinal NeoplasmsSomatostatinIleal NeoplasmsTumor Markers, BiologicalVipomaGastrinomaEndocrine Gland NeoplasmsGlucagonomaBronchial NeoplasmsRadiopharmaceuticalsParagangliomaCarcinoma, Islet CellPheochromocytomaOrganometallic CompoundsTumor BurdenCell Line, TumorImmunohistochemistry