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ASCO 2014:T790M的异质性状态影响EGFR-TKI耐药NSCLC的化疗结果

2014-05-31 悄悄 译 医学论坛网

摘要号: 11049 第一作者:郑迪,上海市肺科医院肿瘤科 标题:EGFR-TKI治疗的晚期非小细胞肺癌患者的EGFR-T790M获得性突变的动态无创监测及其异质性发现 背景:EGFR-T790M突变是下一代EGFR-TKI的一个有价值的靶点,大约一半的EGFR突变阳性使用EGFR-TKI的NSCLC患者发生获得性耐药的原因是EGFR-T790M突变。在血浆中

摘要号: 11049

第一作者:郑迪,上海市肺科医院肿瘤科

标题:EGFR-TKI治疗的晚期非小细胞肺癌患者的EGFR-T790M获得性突变的动态无创监测及其异质性发现

背景:EGFR-T790M突变是下一代EGFR-TKI的一个有价值的靶点,大约一半的EGFR突变阳性使用EGFR-TKI的NSCLC患者发生获得性耐药的原因是EGFR-T790M突变。在血浆中循环的游离DNA(cfDNA)的EGFR-T790M无创检测已被证明是可行的,因为肿瘤组织的再次活检是具有挑战性的。然而,T790M血浆检测的临床应用还有待探索,特别是监测的的速率、时间、并存的敏感突变状态以及对EGFR-TKI化疗抵抗的潜在影响。

方法:建立了高灵敏度数字PCR方法检测血浆中EGFR突变,并且在EGFR-TKI类药物初治NSCLC患者中验证了其检测cfDNA的高灵敏度和特异性。用这个方法检测了66例EGFR-TKI获得性耐药的疾病进展(PD)的非小细胞肺癌患者血浆cfDNA中的T790M。PD前的血浆样本可用于某些病人。

结果:总体而言,在66例post-PD的患者中检测出36例EGFR-T790M(54.5%)。36例中的10例T790M+患者,5例(50%)在PD前1.5-3.5个月就可以检测到T790M+。然而36 例T790M+ 患者中有30例(83.3%)是T790M并存一个敏感突变。此外,在少数接受过化疗加TKI后PD的患者中,敏感突变和T790M的动态定量变化初步显示,即使在双突变的情况下,T790M和敏感突变DNA可能并不总是来自于同一肿瘤细胞群, T790M突变的异质性水平可以影响EGFR-TKI耐药的NSCLC的化疗结果。

结论:血浆cfDNA的无创监测可以检测到T790M,这与EGFR-TKI治疗晚期非小细胞肺癌患者肿瘤组织中已报道的阳性率类似。T790M可在临床PD3.5个月前从血浆中检测到。在肿瘤细胞中,T790M可能具有或不具有EGFR敏感突变,并且它的异质性状态可能会影响EGFR-TKI耐药的NASLC的化疗的结果。

研究链接:Noninvasive monitoring of dynamics of acquired EGFR-T790M mutation and discovery of its heterogeneity in patients with advanced NSCLC treated with EGFR-TKI.

 


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    2015-03-04 zhlpower
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    2014-12-16 quxin068
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    2014-06-02 lsj628
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    2014-06-02 liuyiping

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摘要号:#11068 第一作者:任胜祥,上海市肺科医院肿瘤科 标题:多发肺毛玻璃结节的NSCLC不一致的驱动基因突变的发生率 背景:在各种恶性肿瘤包括非小细胞肺癌中都已经发现了Intertumor异质性。与肺外转移相比,多肺结节患者具有显著较高的异质性。本研究的目标是在有多个肺内毛玻璃结节(GGNs)的非小细胞肺癌(NSCLC)患者中,比较已知的驱动突变的分布

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