在癌基因驱动的肺癌中,MTAP损失的患病率和可操作性
bioRxiv : the preprint server for biology
|February 6, 2026
概括
甲基氨酸酸酶 (MTAP) 损失在非小细胞肺癌 (NSCLC) 中很常见,表明对PRMT5抑制剂的脆弱性. 将PRMT5抑制剂与TKIs结合起来,对治疗晚期NSCLC有很大的前景.
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:
- 在非小细胞肺癌 (NSCLC) 中,观察到甲基氨酸酸化酶 (MTAP) 损失与可操作的基因组变化.
- 失去MTAP会对蛋白质氨酸甲基转移酶5 (PRMT5) 抑制产生脆弱性.
- 目前对MTAP损失患病率的估计可能低估了其发生率,PRMT5抑制剂在癌基因驱动的NSCLC中的有效性需要进一步调查.
研究的目的:
- 使用免疫组织化学 (IHC) 评估NSCLC中MTAP损失的流行率.
- 评估PRMT5抑制剂在MTAP删除的NSCLC细胞系中具有常见驱动器改变的抗增殖活性.
- 确定将PRMT5抑制剂与氨酸激酶抑制剂 (TKI) 结合的疗效.
主要方法:
- 在243个NSCLC标本中,IHC评估了MTAP表达.
- 单独治疗PRMT5抑制剂和与TKIs结合治疗的抗增殖活性在22个含EGFR,KRAS或ALK变异的MTAP删除NSCLC细胞系中进行了评估.
主要成果:
- 在18%的NSCLC标本中发现了MTAP损失,其中包括20%的转移性瘤.
- 在MTAP被删除的NSCLC细胞系中,PRMT5抑制剂的灵敏度各不相同,不论TKI灵敏度或特定驱动器改变.
- 与TKIs结合治疗与PRMT5抑制剂单一治疗相比显示出增强的活性.
结论:
- MTAP损失影响了大约五分之一的转移性NSCLC与瘤驱动因素.
- PRMT5抑制剂的有效性独立于TKI暴露,驱动器改变和SDMA表达.
- PRMT5抑制剂和TKI组合疗法需要对晚期NSCLC进行临床评估.
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