在MHC-I-依赖的新抗原呈现途径预测响应率PD-1/PD-L1封锁PD-1/PD-L1
Yuchen Zhang1, Chen Yang1, Yanchao Xu1
1State Key Laboratory of Pharmaceutical Biotechnology, Division of Hepatobiliary and Transplantation Surgery, Department of General Surgery, Nanjing Drum Tower Hospital, The Affiliated Hospital of Nanjing University Medical School, Nanjing, China.
Biomolecules & biomedicine
|November 27, 2024
概括
预测免疫治疗反应至关重要. 将瘤突变负担 (TMB) 与MHC-I通路特征结合起来,包括HLA-A表达和CD8+T细胞分数,显著提高了预测准确度,超出了单独的TMB.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 基因组学就是基因组学.
背景情况:
- 免疫检查点抑制剂 (ICI) 提供持久的抗瘤效果,但缺乏普遍的患者反应.
- 高瘤突变负担 (TMB) 预测临床益处,但需要改进的预测生物标志物.
- 依赖MHC-I的新抗原呈现途径对于抗瘤免疫非常重要.
研究的目的:
- 调查ICI反应中MHC-I抗原呈现途径的预测价值.
- 为了提高超越TMB的免疫治疗结果的预测.
- 确定与对PD-1/PD-L1抑制剂的反应相关的关键免疫特征.
主要方法:
- 对33种癌症类型的TCGA和ICGC体质突变数据进行全癌症免疫基因组分析.
- 对TMB,新抗原负载,MHC-I表达和CD8+T细胞分数的客观反应率 (ORR) 的评估.
- 斯皮尔曼等级相关性和外部队列验证以评估预测准确性.
主要成果:
- TMB与ORR有很强的相关性 (r = 0.783,P = 2.17 × 10−5).
- 整合TMB,HLA-A表达和CD8+T细胞分数显著改善了ORR预测 (r = 0.865,P = 1.80 × 10−6).
- 在免疫疗法响应者和不响应者之间观察到明显的MHC-I通路活性模式.
结论:
- MHC-I抗原呈现途径是PD-1/PD-L1抑制剂反应的重要生物标志物.
- 将TMB与MHC-I通路特征相结合,提供了比单独的TMB更强大的预测能力.
- 这种综合方法可以完善个性化免疫疗法策略,并改善治疗结果的预测.
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