
Keywords: NET; neuroendocrine tumors; GI; gastrointestinal track; CgA; chromogranin A; BA; biogenic amines; 5-HT; 5-hydroxytryptamine (serotonin); A; adrenaline; NA; noradrenalin; DA; dopamine; NBL; neuroblastoma; 5-HIAA; 5-hydroxyindoleacetic acid; CAT; catecholam