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使用多样本/多平台方法进行序列基因组分析,以更好地定义狂宫肌肉瘤进展和复发.

Henry de Traux de Wardin1,2, Josephine K Dermawan1, Marie-Sophie Merlin3

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拉布多米索尔科马 (RMS) 的基因组分析揭示了融合阳性RMS中的稳定基因组和融合阴性RMS中的获得突变. 液体活检有效检测瘤进展,并有助于监测治疗反应.

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科学领域:

  • 在瘤学瘤学.
  • 基因组学就是基因组学.
  • 分子生物学分子生物学

背景情况:

  • 从原发性到复发性疾病的拉布多米索尔科马 (RMS) 进展的基因组景观仍然不完全表征.
  • 了解基因组变化对于开发有效的治疗策略和监测RMS治疗反应至关重要.

研究的目的:

  • 评估各种下一代测序 (NGS) 平台对RMS基因组分析的敏感性.
  • 评估使用液体活检监测RMS患者治疗反应和复发的可行性.
  • 为了研究原发性和复发性融合阳性 (FP-RMS) 和融合阴性 (FN-RMS) 轮骨髓肉瘤之间的基因组差异.

主要方法:

  • 来自35名RMS患者 (18名FP-RMS,17名FN-RMS) 的原发性/复发性瘤样本被用向DNA和全外体序列 (WES) 分析.
  • 来自10名患者的循环瘤DNA (ctDNA) 用针对性的36基因RMS面板和浅层全基因组测序 (WGS) 来分析副本数量变异.
  • 对于检测单核酸变异,融合和副本数量变化的灵敏度,NGS平台进行了比较.

主要成果:

  • 融合阳性RMS在复发时表现出基因组稳定性,常见的二次变化 (CDKN2A/B,MYCN,CDK4) 影响生存.
  • 融合阴性RMS在复发时获得了更多的新变异,特别是SMARCA2误解突变.
  • 在所有RMS患者的诊断时,ctDNA分析成功检测出了病理学变异,在FP-RMS的86%和FN-RMS的100%中确认了复发.
  • 在ctDNA中增加的融合读数与更高的疾病负担相关,并预测了致命的结果.

结论:

  • 配对的初级和复发性RMS样本的基因组分析揭示了FP-RMS和FN-RMS之间的明显进展模式.
  • 使用ctDNA进行液体活检是一种可行且敏感的方法,用于检测RMS变化并监测疾病进展和复发.
  • 这些发现为将液体活检纳入未来临床试验以监测RMS治疗提供了强有力的理由.