ASCO2019|食管鳞状细胞癌中染色体11q13扩增与免疫检查点封锁的临床有益的关联

2019-06-04 小M MedSci原创

第55届美国临床肿瘤学会(ASCO)年会于2019年5月31日至6月4日在美国芝加哥召开。本次会议吸引世界3万8千名肿瘤专家参与。

第55届美国临床肿瘤学会(ASCO)年会于2019年5月31日至6月4日在美国芝加哥召开。本次会议吸引世界3万8千名肿瘤专家参与。
 
食管鳞状细胞癌(ESCC)是南美洲和东亚国家食管癌的主要组织学亚型(约占食管癌的90%),先前的研究已经显示了程序性细胞死亡1(PD-1)靶向治疗在转移性ESCC患者亚组中的功效。然而,基于PD-1抗体的免疫疗法的稳健预测性生物标志物仍未确认。
 
2018年12月我国批准Toripalimab(特瑞普利单抗)上市,用于治疗既往接受全身系统治疗失败后的不可切除或转移性黑色素瘤患者。为了评估了toripalimab(实体瘤中的人源化PD-1抗体)的安全性和活性,中山大学王峰教授团队介绍说:“为了确定相应的分子决定因素,我们对患者的样本进行了全外显子组测序,信使RNA测序和免疫组织化学,并评估了基因组和转录生物标记,PD-L1表达和肿瘤突变负荷与临床疗效的相关性。”
 
研究纳入60例晚期化疗难治性ESCC患者,其中59例接受toripalimab治疗。 94.9%(56/59)患者在16个月后至少经历过一次治疗相关不良事件;主要是1级或2级。治疗相关的3级或更高的发生在30.5%(18/59)的受试者中。
 
 
截至数据截止日期,11例患者达到客观反应,而疾病控制率为47.5%。全外显子组测序显示,50名患者中有24名(48%)染色体11q13区扩增(Figure3 A),这与扩增基因的mRNA表达升高一致,包括CCND1(细胞周期蛋白D1)和成纤维细胞生长因子家族成员(FGF3 / 4/19)(Figure3 B)。没有11q13扩增的患者具有明显更好的客观缓解率(ORR 30.8%对比4.2%,p = 0.024)和无进展生存期(3.7对2.0个月,HR = 0.47 [95%CI 0.24至0.91],p = 0.025)与11q13扩增个体相比。相反,具有高突变负荷或阳性PD-L1表达的患者在ORR或存活中没有显示出显着优势。
 
 
最终研究结果认为,Toripalimab在化疗难治性ESSC患者中具有可控的安全性和有希望的抗肿瘤活性。 11q13区域的基因组扩增可以作为接受基于抗辐射PD-1的免疫疗法的晚期ESSC患者的阴性预测标志物,具体的机制正在进一步研究中。
 
受访者:王峰,中山大学肿瘤防治中心副主任
 
1. Q:您对这次会议有什么感受和收获?
A:中国临床工作者应继续努力向国际同道学习。目前,我们的研究在非常前沿的领域创新少,新药的开发和靶点发现滞后。但在很多其它的研究领域,都走在了国际的前沿。中国的肿瘤工作者在ASCO大会上认可度差一些,需要努力增强中国的声音,扩大国际影响力。
2. Q:您能建议中国医生努力的方向吗?
A:中国医生临床工作负担很重,所以参与临床试验,focus很重要。

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    2020-04-27 quxin068
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    2019-06-06 zhouqu_8

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