Acta Neuropathologica: CNS副神经节瘤的分子特征确定马尾副神经节瘤是一种独特的肿瘤实体

2020-09-17 网络 网络

副神经节瘤和嗜铬细胞瘤是一种罕见的神经系统肿瘤,其起源于肾上腺髓质的肿瘤称为嗜铬细胞瘤(PCC),而位于肾上腺外的肿瘤称为副神经节瘤(PGL)。

副神经节瘤和嗜铬细胞瘤是一种罕见的神经系统肿瘤,其起源于肾上腺髓质的肿瘤称为嗜铬细胞瘤(PCC),而位于肾上腺外的肿瘤称为副神经节瘤(PGL)。副神经节源于不同的迁移性神经嵴细胞亚群,产生交感神经、分泌儿茶酚胺的PGL(主要是腹胸)或非分泌的副交感神经PGL(主要是头颈部PGL)。中枢神经系统(CNS)副神经节瘤几乎只发生在马尾区或桥小脑角,常被称为颈静脉球瘤或颈静脉鼓室旁神经节瘤。与较常见的腹部(85%)、胸部(12%)和头颈部(3%)PGL相比,马尾区(CEP)的副神经节瘤非常罕见(占所有PGL的1%),仅占下腰椎所有肿瘤的3-4%。尽管其解剖位置不同,但PGLs具有独特的形态学和超微结构特征,并被认为是同一肿瘤实体,尽管CEPs的组织发生机制尚不清楚,副神经节作为肿瘤起源于终丝或马尾尚未被描述。

在本文中,作者团队分析了57个马尾副神经节瘤的全基因组DNA甲基化谱,发现这些肿瘤在表观遗传学上不同于非脊柱副神经节瘤和其他肿瘤。与其他部位的副神经节瘤不同,马尾副神经节瘤普遍缺乏染色体不平衡。此外,RNA和DNA外显子组测序显示,在非脊髓副神经节瘤中发现的频繁遗传改变-包括预测相关的SDH突变-在马尾副神经节瘤中不存在。在组织学上,马尾副神经节瘤常表现为神经节细胞分化,对泛细胞角蛋白和细胞角蛋白18免疫反应性强,这在其他部位的副神经节瘤中并不常见。本研究的病例都没有家族性副神经节瘤综合征。肿瘤很少复发(9%)或表现为脊髓间室多发性病变(7%),但没有转移到中枢神经系统以外。总之,本文显示马尾副神经节瘤是一种独特的、散发的肿瘤实体,由独特的临床和形态分子特征决定。

方法:基因组DNA从福尔马林固定和石蜡包埋(FFPE)样本和血液中提取,根据制造商的协议,使用Maxwell 16血液和组织DNA纯化试剂盒(Promega)。除了公开可用的20个CEP(GSE109381)的甲基化谱外,使用Illumina Infinium甲基化EPIC阵列对37个马尾副神经节瘤(35个原发肿瘤,2个复发)和24个头颈部副神经节瘤进行DNA甲基化分析。

总而言之,在这项研究中,作者使用全基因组DNA甲基化分析以及整个外显子DNA和RNA测序分析了大量CEP。结果与腹、胸、头颈部副神经节瘤比较,本文的数据表明CEP是一个独立的肿瘤实体,具有独特的分子、组织病理学和临床特征。

Schweizer, L., Thierfelder, F., Thomas, C. et al. Molecular characterization of CNS paragangliomas identifies cauda equina paragangliomas as a distinct tumor entity. Acta Neuropathol (2020).

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    2021-06-25 windight
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    2021-02-11 lg.zhao
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    2021-03-30 yb6560
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