胰腺实性假乳头状肿瘤的组织病理特征分析

目的 分析总结胰腺实性假乳头状肿瘤(SPT)的组织病理特点.方法 回顾性分析51例SPT患者的临床资料,通过免疫组化法检测其中39例SPT组织蜡块中神经特异性烯醇化酶(HSE)、突触素(SYN)、神经细胞黏附分子1(CD_(56))、神经内肽酶(CD_(10))、巢蛋白(Nestin)、波形蛋白(Vim)、S100收集组织蛋白(S100)、a1抗糜蛋白酶(a1-ACT)、a1抗胰蛋白酶(a1-AT)、上皮膜抗原(EMA)、抗广谱细胞角蛋白单抗(AE1/AE3)、角蛋白多肽(CK19)的表达.结果 SPT组织病理特征为假乳头结构形成和区域性坏死,无腺泡结构.39例SPT中,NSE表达率达97.4%,CD_(56)和CD_(10)的表达率均为84.6%,Nestin和Vim表达率分别为64.0%和87.0%,S100的表达率为79.5%,a1-ACT和a1-AT的表达率分别为82.1%和79.5%,而SYN的表达率仅12.8%,EMA、AE1/AE3和CK19等表达很少,呈弱阳性反应.结论 SPT典型病理特征是由于肿瘤组织不同区域相对缺血、缺氧所造成的退行性变的结果,SPT表达多种组织来源的抗原,反映其可能来源于胰腺干细胞及与其发育密切相关的胚胎神经嵴的神经前体细胞,且在发育过程中发生分化不成熟的结果.

Pathological characteristics of the solid pseudopapillary tumor of pancreas

Objective To summarize and analyze the pathological characteristics of solid pseudopapillary tumor of pancreas (SPTs).Methods The clinical data of 51 cases of SPTs were retrospectively analyzed.The immunohistochemical localizations of different markers (HSE,SYN,CD_(56),CD_(10),Nestin,Vim,a1-ACT,EMA,AE1/AE3 and CK19) on 39 SPTs were studied.Results Pathological features included a combination of solid and cystic components with pseudopapillae formation and degenerative regions without glands.Among the 39 cases of SPTs,the expression rate of NSE was 97.4%,the expression rate of CD_(56),CD_(10) was 84.6%,the expression rate of Nestin and Vim was 64% and 87%,the expression rate of S100 was 79.5%,the expression rate of a1-ACT and a1-AT was 82.1% and 79.5%,while the expression rate of SYN was 12.8%;however there was low expression and weak positive reaction of EMA,AE1/AE3 and CK19.Conclusions The typical pathological characteristics of SPTs may result from gradual degenerative changes induced anoxemia in some SPT's areas.The heterogeneity of SPTs on different antibody markers showed that the SPTs may be originated from pancreatic embryonic stem cells,and result from immature differentiation of the pluripotential stem cells during pancreatic genesis.