在上皮癌中,不匹配修复缺陷和微卫星不稳定性
B Altieri1, S Kircher2, S Herterich3
1Department of Internal Medicine I, Division of Endocrinology and Diabetes, University Hospital, University of Würzburg, Würzburg, Germany; Bavarian Cancer Research Center (BZKF), University Hospital of Würzburg, Würzburg, Germany.
ESMO open
|February 6, 2026
概括
不匹配修复缺陷 (dMMR) 在14%的上腺皮质癌 (ACC) 中发生,但不能预测临床结果或对免疫检查点抑制剂 (ICI) 的反应. 对于确定ACC患者遗传性癌症风险,MMR检测至关重要.
科学领域:
- 在瘤学瘤学.
- 遗传学 是一个遗传学.
- 癌症免疫学 癌症免疫学
背景情况:
- 遗传和表观遗传变化导致不匹配修复 (MMR) 缺陷 (dMMR),导致微卫星不稳定 (MSI).
- 在几种癌症中,dMMR/MSI预测了对免疫检查点抑制剂 (ICI) 的反应.
- 上腺皮癌 (ACC) 中dMMR/MSI的相关性尚不清楚.
研究的目的:
- 调查ACC中的MMR系统和MSI.
- 探索dMMR/MSI与临床特征/结果之间的关联.
- 在ACC中评估dMMR/MSI和ICI反应之间的相关性.
主要方法:
- 在109个ACC组织中检测MLH1,PMS2,MSH2,MSH6的免疫组织化学.
- 通过桑格测序验证生殖系/体质MMR变异.
- 评估MLH1甲基化,EPCAM删除和MSI通过多重结依赖的探针放大和plex PCR.
主要成果:
- 在15%的ACC病例中发现了dMMR,主要是MSH6损失.
- 在dMMR和非dMMRACC之间,临床特征或生存率没有显著差异.
- dMMR ACC显示其他恶性瘤的频率略高 (27%对11%).
- dMMR与生殖系/体质MMR变异或MLH1高甲基化有关,但只有3/10显示MSI.
- 在5%的患者中发现了林奇综合征.
- 在dMMR治疗与非dMMRACC治疗的ICI治疗中进展时间没有差异 (4个月与5个月).
结论:
- dMMR发生在少数ACC中,通常没有MSI.
- 在ACC中,dMMR不能预测临床特征或ICI反应.
- 对于识别具有遗传癌症风险的人来说,MMR检测很重要.
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