类癌瘤可能是由原始外胚层来的一种不常见的嗜银细胞肿瘤。它分泌5-羟色胺(5-HT),羟色氨酸血管舒缓素、组织胺和促肾上腺皮质激素(ACTH)。1953年第一次从类癌瘤中分离出5-HT。5-HT 的代谢产物,5-羟基吲哚乙酸(5-HIAA)在类癌综合症患者尿中的浓度增加这一特征是临床上研究类癌综合征的根据。各种类癌瘤均是采用常规的染色方法即银反 Carcinoid tumors may be an unusual form of argyrophil cancer that arises from the primitive ectoderm. It secretes 5-hydroxytryptamine (5-HT), hydroxytryptolysin, histamine and adrenocorticotropic hormone (ACTH). For the first time in 1953, 5-HT was isolated from carcinoid tumors. The characteristic 5-HT metabolites, 5-hydroxyindolylacetic acid (5-HIAA), in the urine of patients with carcinoid syndrome, is the basis for clinical studies of carcinoid syndrome. A variety of carcinoid tumors are stained with conventional methods that are silver