J Hepatol:肝内胆管癌的时空演化

2018-03-25 MedSci MedSci原创

对空间和克隆进化的综合研究可能为进一步了解ICC的肿瘤发生和进展提供重要的分子基础。

研究背景:肝内胆管癌(ICC)是第二致命的原发性肝癌。关于瘤内异质性(ITH)及其对ICC进展的影响,了解很少。本研究的目的是调查瘤内异质性(ITH),以期帮助制定新的治疗策略。

研究方法:研究从6个可操作的ICCs患者中获得69个空间不同的区域。为每个区域建立患者源性原发性肿瘤细胞(PDPCs),其次为全外显子组测序(WES)和多层验证。

研究结果:研究观察到,无论是体细胞突变还是克隆结构,都由多个机制造成,如克隆"错觉"、平行进化和染色体不稳定性。60.3%的突变是异质突变,其中85%的驱动突变位于肿瘤系统发育树的分支上。在肿瘤抑制基因,如TP53、SMARCB1和PBRM1中,有许多细胞和克隆驱动突变参与DNA修复和染色质重建。在大多数病例(5/6)中,在截断突变后,基因组加倍发生(5/6),并由所有瘤内亚区共享。在所有病例中,持续的染色体不稳定性在ICC的进化轨迹中是显而易见的。ICC1239的复发为ICC的多克隆转移提供了证据。在转移过程中,突变体的变化和亚克隆的内部多样性,如化学抵抗介质的丧失,可能被用于新的治疗策略。IDH1、JAK1和KRAS突变和EGFR扩增的靶向治疗。

研究结论:对空间和克隆进化的综合研究可能为进一步了解ICC的肿瘤发生和进展提供重要的分子基础。

原始出处:

Dong LQ, Shi Y, Ma LJ, et al. Spatial and temporal clonal evolution of intrahepatic cholangiocarcinoma. J Hepatol, 2018 Mar 15. doi: 10.1016/j.jhep.2018.02.029.

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    2018-03-27 gwc384
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