CD47阻断 (ALX301) 增强了HPV阴性头角状细胞癌的免疫放射疗法反应
Abdula Monther1,2, Riyam Al-Msari1,3, Robert Saddawi-Konefka1,4,5
1Moores Cancer Center, UC San Diego, La Jolla, California United States of America.
PloS one
|February 17, 2026
概括
结合CD47阻断与抗PD1免疫疗法和放射疗法,在治疗头部和部状细胞癌 (HNSCC) 方面显著有前途. 这种方法增强了抗瘤免疫反应,并改善了临床前模型的结果.
科学领域:
- 在瘤学瘤学.
- 免疫治疗是一种免疫疗法.
- 癌症研究 癌症研究
背景情况:
- 头部和部状细胞癌 (HNSCC) 对晚期的治疗选择有限.
- CD47免疫检查点抑制剂可以通过阻止CD47/SIRPa相互作用来增强抗瘤免疫力.
- 与抗PD1免疫疗法相结合的CD47阻断在各种癌症中表现出潜力,包括HNSCC.
研究的目的:
- 在局部先进的HNSCC模型中,研究结合抗CD47融合蛋白 (ALX301) 与抗PD1免疫疗法和放射治疗的抗瘤活性.
- 评估CD47阻断对免疫细胞功能和瘤微环境的影响.
- 评估这种组合治疗在抗PD1耐药HNSCC模型中的疗效.
主要方法:
- 使用一种同源性HPV阴性HNSCC小鼠模型 (4MOSC1) 和一种抗PD1耐药模型 (4MOSC2).
- 单独使用ALX301 (抗CD47融合蛋白) 或与抗PD1免疫疗法结合使用.
- 结合淋巴节约性放射治疗作为新辅助治疗.
- 评估瘤回归,生存,免疫细胞透 (MHC-II,CD86,CD8+T细胞) 和T细胞受体克隆性.
主要成果:
- 在4MOSC1模型中,ALX301结合抗PD1诱导了完整的瘤回归;单一治疗显示了部分反应.
- CD47阻断增加了树突细胞上的MHC-II和CD86表达,增强了抗原呈现.
- 在抗PD1耐药的4MOSC2模型中,组合疗法显著回归瘤,改善存活率和T细胞保留率.
- T细胞受体测序表明,瘤和淋巴结之间的免疫细胞参与度增加.
结论:
- 结合CD47阻断,抗PD1和放射治疗的联合治疗增强了HNSCC的抗瘤免疫反应.
- 这种组合方法甚至在抗PD1耐药瘤中也显示出有效性.
- 这些发现支持对局部先进的HPV阴性HNSCC进行组合免疫放射治疗的临床研究.
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