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在骨外肌性肌肉肉癌中发生的二次遗传变化

Yamato Suemitsu¹, Hsin-Yi Chang^2,3, Carla Saoud³

¹Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, New York, New York, USA.

Genes, chromosomes & cancer

|August 19, 2025

概括

骨外神经性肌肉肉瘤 (EMC) 中的二次遗传变化 (SGA) 与较差的生存率有关. 虽然大多数EMC病例的瘤突变负担较低,但SGA的存在会对无病和整体存活率产生负面影响.

科学领域:

在瘤学瘤学.
遗传学是一个遗传学.
病理学病理学病理学

背景情况:

骨外肌性软骨肉瘤 (EMC) 是一种罕见的肉瘤,其特征是NR4A3基因融合.
在EMC中二次遗传改变 (SGA) 的频谱和临床影响仍未得到充分研究.
以前的研究主要集中在融合变体和组织学上,对并发的遗传事件的调查有限.

研究的目的:

在EMC中全面调查SGA的发生率和频谱.
评估SGA与NR4A3融合亚型和临床结果的关联.
探索EMC的基因组景观,超越已有的融合驱动器.

主要方法:

在20个来自18名患者的EMC瘤样本上使用了基于混合捕获的向DNA下一代测序 (NGS) 试验 (MSK-IMPACT).
使用Archer FusionPlex和/或光 in situ杂交 (FISH) 确认了NR4A3的融合亚型.
审查了临床病理学数据和与生存结果相关的分子发现.

主要成果:

最常见的NR4A3融合涉及EWSR1 (78%),罕见的融合涉及TAF15,TCF12和FUS.
所有病例都表现出低瘤突变负担 (TMB).
三分之二的EMC案件有并发的SGA,TP53的改变是最常见的.
患有至少一种SGA的患者的无病存活率 (DFS) 和整体存活率 (OS) 显著降低.
非EWSR1融合变体显示,与EWSR1重新排列的瘤相比,SGA的数量更高的趋势.

结论:

虽然在EMC中SGA的存在很少,但与明显更糟糕的生存结果有关.
本研究提供了关于SGA及其预后影响的EMC基因组景观的首个全面分析.
需要进一步的多机构研究来阐明特定的融合变体,SGA和EMC中的生存之间的相关性.

关键词:

这是EWSR1.这就是FUS FUS.在NR4A3中,它是NR4A3的.在TAF15中,TAF15是TAF15.在TCF12中,我们可以使用TCF12.没有NGS,没有NGS.骨外肌性肌性软骨髓瘤 (chondrosarcoma) 是一种二次变化的二次变化.

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