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类癌所以被人们如此重视是因为它们有内分泌功能,并能引起一些特殊症状。过去曾经认为该类肿瘤是良性的,但现已清楚地认识到它们有潜在的恶变倾向。本病手术前诊断非常困难,需根据临床、试验室及X线资料综合判定。根据尸检材料分析,类癌的发病率介于0.08%—0.36%之间。它们由起源于外胚层的原始神经嵴的细胞成分衍化而来。这些细胞虽然迁移到各个不同部位,但它们属于同一类细胞,有其共同特点,具有能摄取胺的前体并使之脱羧的作用(AP UD)。因此这些类癌APUD肿瘤能发生在胃肠道,胃肠道的衍化物——胰腺导管,原始胃肠道衍化物
Carcinoids are so valued by people because they have endocrine function and can cause some special symptoms. In the past, this type of tumor was considered benign, but it is now clearly understood that they have a potential for malignant transformation. The preoperative diagnosis of this disease is very difficult and needs to be comprehensively determined based on clinical, laboratory and X-ray data. According to the autopsy material analysis, the incidence of carcinoid was between 0.08% and 0.36%. They are derived from the cellular components of the primitive neural crest that originated in the ectoderm. Although these cells have migrated to different sites, they belong to the same type of cells and share the same features. They have the effect of uptake and decarboxylation of amine precursors (AP UD). Therefore, these carcinoid APUD tumors can occur in the gastrointestinal tract, gastrointestinal derivatives - pancreatic ducts, the original gastrointestinal tract derivatives