Clini cancer research:ADT联合Cy/GVAX治疗对前列腺肿瘤微环境T细胞浸润的影响

2020-07-03 MedSci原创 MedSci原创

雄激素剥夺疗法(ADT)可促进前列腺癌的抗肿瘤免疫力。但以疫苗为基础的方法是否可放大这种效应?

背景:既往研究表明,雄激素剥夺疗法(ADT)可促进前列腺癌的抗肿瘤免疫力。但以疫苗为基础的方法是否可放大这种效应仍不明确。

方法:研究人员开展了一项新辅助的随机试验,以量化分泌GM-CSF的同种异体细胞疫苗联合小剂量环磷酰胺(Cy/GVAX)继以degarelix(地加瑞克)对比单用地加瑞克治疗拟进行前列腺癌根治术的高风险的局部前列腺腺癌患者的免疫效果。

结果:与未治疗的队列相比,Cy/GVAX+地加瑞克和单用地加瑞克都可显著增加肿瘤间浸润的CD8+T细胞和PD-L1的表达。但是,CD8+T细胞浸润伴随调节T细胞(Treg)的比例增加,提示适应性Treg抗性可能会抑制ADT的免疫原性。虽然Cy/GVAX继以地加瑞克与PSA进展前时间和治疗间隔小幅度的改善以及PD-L1的表达增加有关,但与单用地加瑞克相比,CD8+T细胞的浸润情况没有差异。基因表达谱分析表明,与单用地加瑞克相比,Cy/GVAX+地加瑞克显著上调了巨噬细胞标志物CHIT1。

结论:本研究强调了ADT联合或不联合Cy/GVAX在前列腺肿瘤微环境中诱导的复杂免疫反应。这些数据对于ADT与免疫疗法联合应用具有重要意义。特别是,ADT会增加CD8+T细胞和Treg的数量这一结果支持将ADT与Treg耗竭剂联合治疗前列腺癌的方案的发展。

原始出处:

Aleksandar Z. Obradovic,et al. T-Cell Infiltration and Adaptive Treg Resistance in Response to Androgen Deprivation With or Without Vaccination in Localized Prostate Cancer. Clinical Cancer Research. July 01,2020.

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