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类癌 (ｃａｒｃｉｎｏｉｄ)属于一种低度恶性的神经内分泌肿瘤 ,发病率低 ,其传统部位是胃肠道和呼吸道 ,胃肠道占 3/4。胃肠道类癌大多起源于粘膜层基底部的肠嗜铬细胞 (ＥＣＬ) ,这些细胞属于具有摄取胺前体和脱羧等生化特性的细胞系 ,即ＡＰＵＤ细胞 (ａｍｉｎｅｐｒｅｃｕ
Carcinoid belongs to a type of low-grade neuroendocrine tumor with low incidence. Its traditional part is the gastrointestinal tract and respiratory tract, and the gastrointestinal tract accounts for 3/4. Gastrointestinal carcinoids mostly originate from the intestinal chromaffin cells (ECL) in the basement of the mucous membranes. These cells belong to cell lines with biochemical properties such as uptake of amine precursors and decarboxylation, ie, APUD cells (amineprecu