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Future Oncol:适合于东亚结直肠癌患者MSI检测位点新研究

2018-07-05 佚名 肿瘤资讯

近日,国际肿瘤期刊《Future Oncology》发表的一篇题为“The clinicopathological features and prognosis of tumor MSI in East Asian colorectal cancer patients using NCI panel”文章,通过对东亚结直肠癌(CRC)患者不同MSI检测位点进行对比,确定出最佳MSI检测Panel,

近日,国际肿瘤期刊《Future Oncology》发表的一篇题为“The clinicopathological features and prognosis of tumor MSI in East Asian colorectal cancer patients using NCI panel”文章,通过对东亚结直肠癌(CRC)患者不同MSI检测位点进行对比,确定出最佳MSI检测Panel,并对东亚结直肠癌MSI发生率,临床病理特征及预后的相关性进行分析总结。该研究由上海长海医院、华中科技大学同济医学院附属协和医院及上海桐树生物科技等3家科研机构共同完成,为MSI(微卫星不稳定性)在结直肠癌患者的诊断临床病理特征及预后意义等方面提供重要的临床指导意义。

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本文研究人员采用两种不同检测位点测定MSI,并结合MMR蛋白免疫组化实验和多元变量分析,探究东亚CRC患者MSI的发生状况、临床病理特征及预后的相关性,研究主要得到以下发现:

●东亚CRC患者MSI发生率略低于欧美人群,人群种族及基因多态性的不同,导致微卫星重复系列存在差异。

●单核苷酸+双核苷酸联合Panel敏感性高于单纯单核苷酸Panel,对于东亚裔CRC患者MSI的检测,单核苷酸+双核苷酸联合Panel更适合。

●东亚裔MSI的临床病理特征与欧美人群基本一致,MSI-H好发于二期、近端、右半结肠部位,且分化较差伴有粘液成分的CRC患者。

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研究背景

结直肠癌(CRC)是最常见的恶性肿瘤之一,据统计,全球每年约有 120 万名患者被确诊为结直肠癌,而有超过 60 万名患者直接或间接死于结直肠癌。因此,结直肠癌已成为现阶段威胁人类健康的重要疾病之一。近年来,随着分子生物学及相关基因组学的发展,人们发现MSI在CRC的精准诊断和治疗中扮演者极其重要的角色,如对CRC预后进行判断,指导5-氟尿嘧啶、伊立替康等化疗药物的反应,帮助诊断筛选Lynch综合征等,MSI已成为结直肠癌预后和临床辅助治疗过程中一个重要分子标志物。

对于结直肠癌MSI的检测,早在2004年,美国国立癌症研究中心(NCI)颁布了贝塞斯达(Bethesda)标准,该标准在MSI检测位点的选择上规定了两种方式:2个单核苷酸(BAT-25、BAT-26)+3个双核苷酸(D5S346、D2S123、D17S250)联合位点的NCI Panel或者5个单核苷酸(BAT-25、BAT-26、NR21、NR22、NR24)单纯位点的Pentaplex Panel。尽管这两种Panel均能准确的检测MSI,但经比较发现,二者在检测内对照设置、MSI-L精准筛查、MSI判定标准等方面仍存在一定的差异和优劣势。近年来,随着MSI相关研究的不断深入,有研究报道针对东亚裔CRC患者MSI表型检测采用2个单核苷酸+3个双核苷酸的联合Panel可能更为适合,但这种观点需要进一步的研究证实。为此本研究以东亚裔CRC患者为研究对象,采用两种不同的位点对MSI进行检测,并采用MMR蛋白免疫组化对两种方法进行评估,旨在为MSI的检测、临床病理及预后提供一定的理论依据。

研究方法

本研究以245例东亚结直肠癌患者为研究对象,其中直肠癌62例,左半结肠癌107例,右半结肠癌40例,其他类型(包括横结肠癌、横结肠-乙状结肠癌、乙状结肠癌等)36例。

采用PCR和IHC对患者MSI和MMR蛋白进行检测,在PCR检测MSI过程中,位点选择采用NCI Panel 和Pentaplex Panel两种检测方法对患者的MSI进行检测,并用免疫组化实验评估MMR蛋白表达与两种Panel检测MSI间的一致性,同时通过多元变量分析MSI-H与临床病理特征及相关基因突变信息的相关性,以此为CRC临床诊断及预后评价提供更为完善的参考价值。

研究结果

1. MMR蛋白表达与MSI的相关性比较

目前,MMR蛋白的免疫组化分析(IHC)已成为临床上检测MSI的一种常用方法,通过检测MLH1、MSH2、PMS2及 MSH6 4种蛋白表达,当4种蛋白均为阳性时,则判读为MMR-I(MMR蛋白完整),如果其中一个蛋白表达缺失则判读为MMR-D(MMR蛋白缺失)。本研究通过采用IHC对患者4种蛋白检测,发现共有28例患者为MMR-D,这28例患者12例(42.9%)为1个蛋白缺失,16例患者(57.1%)为两个蛋白缺失。

对于MSI表型的检测,我们分别采用NCI Panel和Pentaplex Panel两种方法进行检测。在NCI Panel 检测中我们发现有27例患者(11%)为MSI-H表型,2例患者(0.8%)为MSI-L表型,剩下216例患者(88.2%)为MSS表型;相比对于Pentaplex Panel检测,结果显示23例患者(9.4%)为MSI-H表型,1例患者(0.4%)为MSI-L表型,221例患者(90.2%)为MSS表型。值得注意的是,两种方法均发现BAT-25、BAT-26是所有检测位点中最不稳定的,检测灵敏度均大于75%,如图1。



图1 两种方法检测5个MSI标记位点的灵敏度和特异性

2. 不同方法测定MSI状态的一致性比较

通过比较NCI Panel和Pentaplex Panel两种方法的灵敏度和特异性(见表1),结果发现NCI Panel检测的敏感性高于Pentaplex Panel检测的敏感性,这提示NCI Panel检测可能更适合于东亚裔患者。

表1 微卫星标记在无错配修复蛋白表达检测中的预测值



采用MMR IHC对两种Panel进行评估(见表2,表3),结果发现,与Pentaplex Panel相比,NCI Panel与dMMR的一致性可能更高(Kappa值0.898),这表明NCI Panel检测能更好的反映MMR蛋白表达。

表2 免疫组化检测MMR蛋白表达与NCI Panel检测MSI间的一致性



表3 免疫组化检测MMR蛋白表达与五个单核苷酸重复系列检测MSI间的一致性



3. MSI-H与临床病理特征

对于MSI-H与非MSI-H的患者进行比较,发现MSI-H患者与肿瘤分级、右侧肿瘤位置、粘液组织类型相关,与患者年龄、TNM分期、BRAF突变、淋巴结转移不相关。

4. MMR蛋白表达、MSI状态与结直肠癌预后

本研究对245名患者进行为期24个月的随访,结果发现MSI-H患者相比MSS / MSI-L患者有更长的无病生存期(DFS)(图2),同样,MMR蛋白表达缺失(MMR-D)患者较MMR蛋白表达完整(MMR-I)患者表型有更长的无病生存期(DFS)。以上结论表明MMR-D和MSI-H是CRC患者的两个独立预后因素。



图2 MSI表型与患者DFS间关系 

结论

MSI是CRC诊断和治疗领域中一个非常重要的生物标记物,可准确反映CRC病理学特征,同时对CRC的治疗如5-氟尿嘧啶化疗响应也能提供一定的指导,本研究采用两种不同的方法对MSI进行检测比较,并分析MMR蛋白表达、MSI-H与结直肠癌预后间的关系,得到以下结论:

(1)采用NCI Panel对东亚CRC患者MSI进行检测,发现MSI-H约占11%,这一比例较欧美CRC患者(MSI-H约8-20%)略低,这可能与独特的临床病理特征,种族差异及基因多态性相关。

(2)采用NCI Panel 、Pentaplex Panel对MSI进行检测,其中NCI Panel检测分析灵敏度似乎更高,同时与IHC测得的MMR比较,NCI Panel检测的一致性也更好,这可能与两种方法的内对照,cut-off值及MSI发生核苷酸位点相关。

(3)本研究再次证实MSI对CRC患者的预后有一定的指导意义,尤其是MSI-H患者,其无病生存期(DFS)较MSS/MSI-L患者更长,因此MSI-H是CRC治疗预后的一个有效的标志物。

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    2018-07-16 jyzxjiangqin

    结直肠癌靶向药物治疗.

    0

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    2018-07-10 jyzxjiangqin

    适合于东亚结直肠癌靶向药物治疗.

    0

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    2018-07-08 Jackie Li

    学习

    0

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    2018-07-07 小几洁
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    2018-07-07 神功盖世

    学习

    0

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    2018-07-07 sunfeifeiyang

    学习

    0

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