ASCO 2014:综合基因组分析探索肺肉瘤样癌治疗靶点

2014-05-31 李文丰 译 医学论坛网

摘要号:#8073 第一作者:刘学文,中山大学华南肿瘤学国家重点实验室 背景:肺肉瘤样癌是一种罕见的、高度侵袭性肺部肿瘤,预后差,对传统化疗的抵抗率高。人们对其独特的双向分化模式分子基础了解不多。基于更好地了解肺肉瘤样癌分子发病机制的新治疗策略非常必要。我们使用微阵列单核苷酸多态技术(SNP array)和高通量测序技术来识别新型分子治疗靶点。 方法:从肺肉瘤

摘要号:#8073

第一作者:刘学文,中山大学华南肿瘤学国家重点实验室

背景:肺肉瘤样癌是一种罕见的、高度侵袭性肺部肿瘤,预后差,对传统化疗的抵抗率高。人们对其独特的双向分化模式分子基础了解不多。基于更好地了解肺肉瘤样癌分子发病机制的新治疗策略非常必要。我们使用微阵列单核苷酸多态技术(SNP array)和高通量测序技术来识别新型分子治疗靶点。

方法:从肺肉瘤样癌患者的新鲜冰冻肿瘤组织和配对的正常组织上提取10对基因组DNA样本。全基因组外显子测序是在哥伦比亚基因组中心操作,肿瘤组织样本的测序深度中位值为120x,正常组织为60x。由IlluminaTruSeq panel对福尔马林固定石蜡包埋(FFPE)的肿瘤组织DNA进行确认。另外,通过对这10个患者的DNA样本和另外一个肺肉瘤样癌队列的18份FFPE肿瘤组织提取的DNA样本进行Sanger测序,然后选择10个排名第一的基因进行确认。把分离的DNA杂交到Affymetrix SNP 6.0 arrays芯片上,然后与来自两个队列的对照组的689名肺腺癌患者对比。

结果:全基因组外显子测序检测到TP53(7/10,70%)、KRAS(2/10,20%)和PIK3CA(2/10,20%)基因突变,并且通过TruSeqIllumina panel分别进行确认。这10个基因中有8个排在排行榜的顶端,包括RASA1(2/10,20%),RYR2 (2/10, 20%), CDH4 (2/10, 20%), CDH7 (2/10, 20%), LAMB4 (3/10, 30%), MET (2/10, 20%), SCAF1 (2/10, 20%), and LMTK2 (2/10, 20%),使用Sanger测序法对它们进行确认。正在对该队列的18份从FFPE肿瘤组织提取的DNA样本进行确认,且将对新的可操作的靶点进行功能确认。微阵列单核苷酸多态技术能从腺癌标本中清晰地辨认出肉瘤样癌标本,后者染色体3q,7, 8q, 11p, 11q and 17q拷贝数明显增加。

结论:通过高通量测序技术和微阵列单核苷酸多态技术,我们的研究在肺肉瘤样癌中确认出了新分子事件。这个发现也许对于肺肉瘤样癌的新治疗策略发展有帮助。

研究链接:Exploring therapeutic targets in pulmonary sarcomatoid carcinoma by comprehensive genomic profiling. (Abstract 8073)


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    2015-04-05 quxin068
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