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辐射诱导的甲状腺癌的独特分子特征
Danielle M Karyadi1, Tetiana I Bogdanova2, Cato M Milder3
1Laboratory of Genetic Susceptibility, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
Science advances
|August 22, 2025
概括
切尔诺贝利事故的电离辐射暴露与特定的甲状腺皮质癌 (PTC) 基因组特征有关. 与其他驱动因素不同,PTC显示频率增加和与辐射相关的突变特征.
科学领域:
- 癌症学
- 基因组学
- 辐射生物学
背景情况:
- 在切尔诺贝利核电事故发生后, 乳头甲状腺癌 (PTC) 的发病率上升,
- 了解辐射诱导PTC的特定基因组驱动因素对于将其与零星病例区分开来至关重要.
研究的目的:
- 调查皮质甲状腺癌 (PTC) 基因组特征和与切尔诺贝利辐射剂量相关的分子特征.
- 根据剂量和分子特征区分辐射诱导的瘤驱动因素和零星驱动因素.
主要方法:
- 根据驱动因素分类的PTC病例 (n=246) 的基因组概况:BRAFV600E,RAS突变,Fusion2B<20bp,或≥3断点/≥1000bp损失.
- 根据驾驶员类别对辐射剂量和分子特征 (例如,断点计数,删除计数,突变特征) 的建模.
主要成果:
- 结合2B<20bp-PTC频率随着甲状腺辐射剂量增加而显著增加,而其他驱动因素则下降.
- 克隆小删除数和克隆时钟突变特征与辐射剂量和暴露时的年龄相关,具体用于Fusion2B<20bp-PTC.
- 对于BRAFV600E,RAS突变或≥3断点/≥1000bp损失的PTC组,没有观察到辐射剂量与分子特征之间的显著关联.
结论:
- 这些发现强烈支持电离辐射在PTC发展中的因果作用.
- 在Fusion2B<20bp-PTC中的特定基因组变化作为辐射暴露的生物标志物,将其与其他PTC亚型区分开来.
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