在微卫星稳定的结直肠癌中,高瘤突变负担 (TMB):多种分子关联表明可变的病理生理学
1Algoma District Cancer Program, Sault Area Hospital, 750 Great Northern Road, Sault Ste Marie, Ontario, P6B 0A8, Canada; Division of Clinical Sciences, Northern Ontario School of Medicine, Sudbury, Ontario, Canada.
Cancer treatment and research communications
|July 26, 2023
概括
少数具有熟练不匹配修复 (MMR) 的结直肠癌是微卫星稳定的 (MSS),但具有高瘤突变负担 (TMB). 这些MSS瘤可能在KRAS途径,DNA损伤反应基因和表观遗传调节器中存在突变.
科学领域:
- 在瘤学瘤学.
- 基因组学就是基因组学.
- 癌症研究 癌症研究
背景情况:
- 与不匹配修复 (MMR) 缺陷的结肠直肠癌 (CRC) 是少数,其特点是高瘤突变负担 (TMB) 和对免疫治疗的敏感性.
- 大多数CRC都是MMR熟练 (微卫星稳定,MSS) 并且通常具有低TMB,但一个子集表现出高TMB.
研究的目的:
- 为了识别和表征MSS结肠直肠癌与高TMB.
- 调查潜在的基因组驱动因素,导致MSSCRC中高TMB.
主要方法:
- 来自已发表的结直肠癌研究的基因组数据通过cBioportal进行了分析.
- 根据MSS状态和TMB>10个突变/Mb的情况选择了病例.
- 从四项研究中检查了MSI状态数据.
主要成果:
- 在特定队列中,大约7.5-9.5%的MSS结肠直肠癌患者表现出高TMB (>10突变/Mb).
- 在MSS高TMBCRC中,与MSS低TMB对应物相比,KRAS通路基因的突变更频繁.
- 在MSS高TMBCRC中,DNA损伤反应 (DDR) 和表观遗传调节基因的突变也更为普遍.
结论:
- 在KRAS信号通路的变化可能有助于增加突变负担在MSS结肠直肠癌的一个子集.
- DNA损伤反应 (DDR) 和表观遗传修饰物的突变可能与MSS结肠直肠癌中的高TMB有关.
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