在结肠直肠瘤发生过程中,非典型的BRAF和KRAS突变的同进化
Connor E Woolley1, Enric Domingo1, Juan Fernandez-Tajes1
1Department of Oncology, University of Oxford, Oxford, United Kingdom.
Molecular cancer research : MCR
|January 3, 2025
概括
大肠直肠癌中的BRAF突变有三个类. 非V600E BRAF突变 (2/3类) 与更好的结果有关,但可以与其他Ras突变同时发生,改变预后.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 大肠直肠癌 (CRC) 中的BRAF突变分为三个功能类:具有高激酶活性的类1 (例如V600E),具有较低活性的类2和缺乏激酶活性的类3.
- 非1类BRAF突变与有利的预后特征有关,包括微卫星稳定性,远端瘤位置和对抗EGFR治疗的改善反应.
- 了解这些BRAF突变类别的独特分子和临床影响对于CRC患者管理至关重要.
研究的目的:
- 在一大群结直肠癌患者中分析不同BRAF突变类 (1,2,3) 的患病率和临床意义.
- 在这些类别中调查BRAF突变与其他Ras路径改变的同时发生模式.
- 描述BRAF突变类之间的分子和预后差异,特别关注第3类及其与其他Ras突变的相互作用.
主要方法:
- 对13个结直肠癌队列的分析,包括6,605个瘤,以比较第1,第2类和第3类BRAF突变.
- 评估同时发生的Ras路径突变 (KRAS,NRAS,NF1) 和它们的位置.
- 评估Ras通路激活水平,EGFR连体表达,并比较突变负担,特征,驱动突变和转录亚型.
主要成果:
- 在CRC的10.7%中发现了1类BRAF突变,在0.47%中发现了2类,在1.22%中发现了3类.
- 与1级不同的是,2级和3级BRAF突变CRC经常与非典型部位的额外Ras路径突变 (分别为29.0%和45.7%) 同时发生,不像1级.
- 3类瘤与染色体不稳定的CRCs有相似之处,而2类则表现出中间特征. 非典型的BRAF突变改善了生存率,除非存在额外的Ras突变.
结论:
- 通过两种突变模型,BRAF 3 类突变可能会放大现有的 Ras 信号,从而可能导致瘤发生.
- 2类和3类BRAF突变中的异质性,特别是关于同时发生的Ras变异,需要全面的分子分析,以便在结直肠癌中准确预后和治疗选择.
- 在结直肠癌中,在BRAF突变类中存在着不同的分子概况和临床行为,突出显示出需要细微分类,而不仅仅是突变的存在或不存在.
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