JAMA Oncol:PD-L1抗体对肥胖的癌症患者疗效更好

2019-12-27 曼话 医药魔方Pro

众所周知,肥胖是与癌症、糖尿病、心血管疾病以及其它疾病有关。全球癌症地图显示,体重超标(包括超重和肥胖)可增加患13种癌症的风险。不过肥胖患者患肿瘤以后的预后,确实有争议。在化疗时代,就有一些研究显示,肥胖患者往往然预后较偏瘦更好。原因可能与肥胖患者更能耐受化疗的副反应等原因有关。但是,免疫治疗时而代呢?12月26日,最新发表在JAMA Oncology上的一项研究却揭示,在某些情况下,BMI

众所周知,肥胖是与癌症、糖尿病、心血管疾病以及其它疾病有关。全球癌症地图显示,体重超标(包括超重和肥胖)可增加患13种癌症的风险。

不过肥胖患者患肿瘤以后的预后,确实有争议。在化疗时代,就有一些研究显示,肥胖患者往往然预后较偏瘦更好。原因可能与肥胖患者更能耐受化疗的副反应等原因有关。但是,免疫治疗时而代呢?12月26日,最新发表在JAMA Oncology上的一项研究却揭示,在某些情况下,BMI较高可能能够改善癌症患者的生存机会。

图片来源:JAMA Oncology

具体来说,在该研究中,来自澳大利亚弗林德斯大学的Ganessan Kichenadasse博士及其同事聚焦了已被批准用于治疗非小细胞肺癌(NSCLC)PD-L1抗体atezolizumab。他们惊讶地发现,BMI高的患者对atezolizumab的反应更强。BMI≥25的NSCLC患者接受该PD-L1抗体治疗后死亡率显著降低(尤其是在PD-L1高表达的情况下),明显获益于这类免疫检查点抑制剂。

图片来源:Lancet Oncology

Kichenadasse博士之所以会想调查BMI与NSCLC患者对atezolizumab的响应的关联,是因为,2018年的一项回顾性研究报道, 在接受免疫检查点抑制剂和靶向疗法治疗的晚期黑色素瘤患者中,肥胖(BMI≥30)与总生存期(OS)、无进展生存期(PFS)改善有关,但在接受化疗治疗的患者中没有发现这种相关性。此外,2019年年初有研究[3]称,对于接受免疫检查点抑制剂治疗的晚期癌症患者,与BMI<25的患者相比,BMI≥25的超重或肥胖患者PFS和OS显著更长。

Kichenadasse博士领导的这项新研究汇总分析了涉及2261例NSCLC患者的4项国际多中心临床试验。其中两个是单臂II期试验:BIRCH(NCT02031458)和FIR(NCT01846416);两个是双臂随机试验,分别为II期试验POPLAR(NCT01903993)以及III期试验OAK(NCT02008227)。在POPLAR和OAK两个试验中,对照组患者接受每3周一次的多西紫杉醇治疗,直至病情进展或发生不可接受的毒性作用。在所有4项试验中,实验组患者都接受每3周一次的atezolizumab治疗。

Meta分析主要调查患者BMI与OS、PFS以及治疗相关不良事件的关系。

2261例患者中,有1548名参与者接受了atezolizumab治疗,排除40例BMI不可用的患者以及74例体重不足(BMI<18.5)的患者,剩余1434例患者可用于进一步分析。在这些患者中,705例(49%)患者体重正常、490例(34%)患者超重(25≤BMI<30),239例(7%)患者肥胖BMI≥30)

BMI与接受atezolizumab和多西紫杉醇治疗的患者OS和PFS之间的关系数据来源:JAMA Oncology

在接受atezolizumab治疗的患者中,BMI升高与OS之间存在线性关系。肥胖与接受atezolizumab治疗的患者的OS显著提高有关,但在接受多西紫杉醇治疗的患者中,肥胖与OS改善无关。在PD-L1高表达亚组中,BMI与OS/PFS的相关性最强。

接受atezolizumab和多西紫杉(Docetaxel治疗的患者的OS(来源:JAMA Oncology)

此外,分析显示,治疗相关的不良事件与BMI无关。

总结来说,这项研究表明,较高的BMI似乎与接受atezolizumab治疗的NSCLC患者的OS改善有关这增加了在未来的免疫检查点抑制剂试验中将基线BMI作为患者分层因素的可能性。

Kichenadasse博士说:“先前已有研究探索被称为‘肥胖悖’的概念,即,虽然肥胖与患某种癌症的风险增加有关,但也能为某些患者带来更大的生存益处。而我们的研究提供了新的证据来支持这一假说即高BMI和肥胖可能与患者对免疫治疗的反应有关。未来,我们需要进一步调查BMI与相关炎症之间的可能关联,这可能会帮助理解这种癌症治疗矛盾的反应背后的机制。”

原始出处:

[1] Ganessan Kichenadasse et al. Association Between Body Mass Index and Overall Survival With Immune Checkpoint InhibitorTherapy for Advanced Non–Small Cell Lung Cancer. JAMA Oncology(2019).

[2] Jennifer L McQuade et al. Associationof body-mass index and outcomes in patients with metastatic melanoma treated with targeted therapy, immunotherapy, or chemotherapy: a retrospective, multicohort analysis. Lancet Oncology(2018).

[3] Alessio Cortellini et al. A multicenter study of body mass index in cancer patients treated with anti-PD-1/PD-L1 immune checkpoint inhibitors: when overweight becomes favorable. Journal for ImmunoTherapy of Cancer(2019).

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    2020-04-02 minlingfeng
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    2019-12-29 heli0118
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    2019-12-28 thm112988

    0

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    2019-12-28 内科新手

    谢谢梅斯提供这么好的信息,学到很多

    0

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    2019-12-28 旺医

    顶刊就是顶刊,谢谢梅斯带来这么高水平的研究报道,我们科里同事经常看梅斯,分享梅斯上的信息

    0

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    2019-12-28 anti-cancer

    谢谢梅斯分享这么多精彩信息

    0

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