ASCO 2014:NSCLC患者血清循环DNA的EGFR突变检测

2014-05-31 悄悄 译 医学论坛网

摘要号:#11094 第一作者:Zongfei Li,北京协和医院检验科 标题:血清循环DNA的EGFR突变检测 背景:作为EGFR靶向药物之一,EGFR酪氨酸激酶抑制剂(TKI)在NSCLC患者的治疗中发挥着重要作用。EGFR的突变是肿瘤对EGFR-TKI敏感的可靠标记物。本文中,我们评估了血清中循环DNA(ctDNA)中EGFR突变与肿瘤的一致性,并且评估

摘要号:#11094

第一作者:Zongfei Li,北京协和医院检验科

标题:血清循环DNA的EGFR突变检测

背景:作为EGFR靶向药物之一,EGFR酪氨酸激酶抑制剂(TKI)在NSCLC患者的治疗中发挥着重要作用。EGFR的突变是肿瘤对EGFR-TKI敏感的可靠标记物。本文中,我们评估了血清中循环DNA(ctDNA)中EGFR突变与肿瘤的一致性,并且评估了通过血液测试来预测EGFR-TKI的疗效可能性。

方法:对404例NSCLC患者样品(组织和血清)进行回顾性分析。通过测序和MCA-qASA测定分别对肿瘤组织和血清ctDNA的EGFR突变(外显子18-21)的进行分析。进行了MCA-qASA测定结合熔解曲线分析,以及预计携带两者优点的等位基因特异qPCR分析。

结果:我们首先采用了MCA-qASA法;该法能够检测到低丰度突变DNA(0.1纳克/微升)和低突变率DNA(0.01%),这可能是有史以来最低的。结果总结在表中,通过DNA测序确定EGFR突变的有123个肿瘤样本,我们发现在其相应的血清样本中99个样品携带EGFR突变。在肿瘤组织样本通过DNA测序没有携带EGFR突变中,我们只发现15个血清样本携带EGFR突变。使用MCA-qASA测定血清ctDNA的EGFR突变可以替代通过DNA测序检测肿瘤组织EGFR突变,这个方法的灵敏度和特异性分别是80.5%(99/123)和94.7%(266/281)。 Kappa系数及正确诊断指数分别为0.767和75.2%。

结论:血清ctDNA和肿瘤组织中EGFR突变的发生是一致的,Youden指数高达75.2%,这是报道过最高的,归因于高灵敏度和高特异性的MCA-qASA测定法。在使用EGFR-TKI治疗无肿瘤组织的NSCLC患者之前,我们推荐检测血清ctDNA的 EGFR突变。

研究链接:Detection of EGFR mutations of serum circulating DNA. 


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    2014-07-11 quxin068
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    2014-11-09 jklm09
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    2014-06-02 liuyiping

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