在BRAF/MEK抑制剂耐火黑色素瘤中对免疫检查点抑制剂的敏感性
Riyaben P Patel1,2, Lydia Rui Jia Lim1,2, Reem Saleh1
1Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.
Journal for immunotherapy of cancer
|May 16, 2025
概括
抗BRAF/MEK抑制剂的黑色素瘤可能仍然对免疫检查点抑制剂 (ICI) 有反应. EGFR过度表达预测了抗性黑色素瘤的ICI反应,这表明向治疗可以改善结果.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 转移性黑色素瘤往往会对BRAF和MEK抑制剂 (BRAFi/MEKi) 产生抗性,经常导致与免疫检查点抑制剂 (ICI) 的交叉抗性.
- 一部分患有BRAFi/MEKi耐药黑色素瘤的患者保持对二线ICI的敏感性,这表明了多样化的耐药性机制.
- 了解BRAFi/MEKi耐性黑色素瘤中的瘤免疫微环境对于识别影响ICI反应的因素至关重要.
研究的目的:
- 为了研究BRAFi/MEKi耐药黑色素瘤中的瘤免疫微环境.
- 揭示对二线ICI治疗的耐药性和反应机制.
- 在BRAFi/MEKi耐性黑色素瘤中确定ICI敏感性的预测生物标志物.
主要方法:
- 使用BRAFi/MEKi耐药黑色素瘤小鼠模型进行机械研究.
- 分析免疫细胞群 (例如CD8+ T细胞) 使用流细胞计.
- 执行RNA测序以描述转录组变化,并确定关键信号通路.
- 评估的临床样本,以检测免疫特征,信号通路和ICI反应之间的相关性.
主要成果:
- 抗BRAFi/MEKi的瘤显示CD8+ T效应细胞增加,这表明免疫刺激反应.
- 确定EGFR-STAT信号通路的激活是内在抗性的驱动因素.
- 具有EGFR激活的瘤保留了对二线ICI的敏感性,与NRAS驱动的耐药瘤不同.
- 临床样本证实了EGFR激活升高与抗性黑色素瘤中较高的免疫评分之间的相关性.
结论:
- EGFR过度表达是BRAFi/MEKi耐性黑色素瘤中二线ICI反应的潜在预测生物标志物.
- 针对EGFR的分层治疗方法可能会改善黑色素瘤ICI治疗的结果.
- EGFR是克服耐药性和提高ICI疗效的有希望的治疗点.
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