Neuroendocrine carcinomas of the gastrointestinal tract.
D003110:Colonic Neoplasms / Q000473:pathology; D004067:Digestive System Neoplasms / Q000473:pathology*; D004938:Esophageal Neoplasms / Q000473:pathology; D006801:Humans; D013274:Stomach Neoplasms / Q000473:pathology