Elife:只需一管血,在早期阶段准确检测卵巢癌

2017-11-01 佚名 生物通

因症状难以察觉,致死率高,卵巢癌一直被称为“沉默的杀手”。不过,美国的研究人员近日开发出一种新技术,可以在早期准确检测卵巢癌。他们通过鉴定血液中的循环microRNA网络来评估卵巢癌风险。这项成果在线发表于《eLife》上。


因症状难以察觉,致死率高,卵巢癌一直被称为“沉默的杀手”。不过,美国的研究人员近日开发出一种新技术,可以在早期准确检测卵巢癌。他们通过鉴定血液中的循环microRNA网络来评估卵巢癌风险。这项成果在线发表于《eLife》上。

大多数妇女在诊断出卵巢癌时已是疾病晚期,只有四分之一的患者可存活五年以上。不过,若能早期发现,卵巢癌患者的5年生存率可从20-30%提高到60-70%。
目前的早期检测手段(如超声检测或CA125检测)假阳性较高。临床试验表明,利用这些手段检测早期卵巢癌时,对生存率没有明显影响。于是,Dana-Farber癌症研究所和布列根妇女医院的研究团队希望找到一种更敏感、更特异的检测工具。

研究人员将目光投向了基因组中的非编码区域——microRNA(miRNA)。布列根妇女医院的Kevin Elias博士将其称之为基因组的文案编辑者,“在基因转录翻译成蛋白质之前,miRNA修改信息,在基因组中添加校对笔记。”Elias是这篇论文的第一作者。

在这项研究中,Elias及其同事发现卵巢癌细胞和正常细胞有着不同的miRNA表达谱。同时,miRNA在血液中循环,这样就能利用血清样本来检测。研究人员对135名妇女(手术或化疗前)血液样本中的miRNA进行测序,创建出一个“训练样本集”。他们借此对计算机程序进行训练,以找出卵巢癌、良性瘤和健康组织之间的miRNA差异。

凭借这种机器学习方法,研究人员可以利用大量的miRNA数据,并开发出不同的预测模型。准确区分卵巢癌和良性组织的模型被称为神经网络模型,它反映了miRNA之间复杂的相互作用。

然后,团队在44名妇女中测试了这个模型,以确定检测的准确性。在准确性得到确认之后,他们又利用859个患者样本来测定此模型的敏感性和特异性。结果表明,这种新技术在卵巢癌预测上比超声检查要好得多。利用超声检测时,只有不到5%的异常结果是卵巢癌,而利用miRNA检测时,几乎100%的异常结果代表了卵巢癌。

最后,研究人员将这个模型应用到实践中。他们利用miRNA检测来预测波兰的51名外科手术患者的诊断结果。在这个群体中,91.3%的异常检测结果是卵巢癌,意味着假阳性率很低。阴性检测结果则在80%的情况下可靠预测癌症不存在,这与巴氏涂片的准确性相当。

“关键在于,这种检测不大可能误诊卵巢癌,在没有恶性肿瘤的情况下,它不会给出阳性信号。这是诊断检测是否有效的标志,”通讯作者、Dana-Farber癌症研究所的Dipanjan Chowdhury如是说。

为了让这种诊断工具进入临床,研究人员需要验证,随着时间推移卵巢癌风险增加时,miRNA的特征将如何改变。为了实现这一点,他们需要不断收集纵向样本。他们还有兴趣了解这种工具是否对高危妇女和一般人群都有用。

原始出处:

Elias KM, Fendler W, Stawiski K,et al.Diagnostic potential for a serum miRNA neural network for detection of ovarian cancer.Elife. 2017 Oct 31;6. pii: e28932. doi: 10.7554/eLife.28932. [Epub ahead of print]

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    2017-11-25 clmlylxy
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    2018-06-15 膀胱癌
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    2017-11-03 jyzxjiangqin

    卵巢癌的检测.

    0

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    2017-11-02 半夏微凉

    厉害了.高科技!

    0

  5. [GetPortalCommentsPageByObjectIdResponse(id=2068533, encodeId=0c4f20685335c, content=<a href='/topic/show?id=59371088215' target=_blank style='color:#2F92EE;'>#Life#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10882, encryptionId=59371088215, topicName=Life)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=fc8528, createdName=clmlylxy, createdTime=Sat Nov 25 21:52:00 CST 2017, time=2017-11-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1973029, encodeId=cd2a19e3029ff, content=<a href='/topic/show?id=72d566e3a6' target=_blank style='color:#2F92EE;'>#eLife#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6673, encryptionId=72d566e3a6, topicName=eLife)], attachment=null, authenticateStatus=null, createdAvatar=http://thirdqq.qlogo.cn/qqapp/1103841572/C2EFD5CFB07FE291138AD4FD0C98E3DE/100, createdBy=e3d52500031, createdName=膀胱癌, createdTime=Fri Jun 15 23:52:00 CST 2018, time=2018-06-15, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=258274, encodeId=550f2582e437, content=卵巢癌的检测., beContent=null, objectType=article, channel=null, level=null, likeNumber=56, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cacheapi.medsci.cn/resource/upload/20160806/IMG57A5698BDB0244113.jpg, createdBy=32a91358059, createdName=jyzxjiangqin, createdTime=Fri Nov 03 07:18:29 CST 2017, time=2017-11-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=258032, encodeId=74a3258032e6, content=厉害了.高科技!, beContent=null, objectType=article, channel=null, level=null, likeNumber=50, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo5nmIH5IQqCKjJgSCuicPWUWOUcdqt1ROPnEiaOYN4pSHibDv8la3OxNLalvuvUXn8clpJlrpuyTpckgt9OPkeSSdT/0, createdBy=8fd71930726, createdName=半夏微凉, createdTime=Thu Nov 02 09:25:55 CST 2017, time=2017-11-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=257942, encodeId=1d1725e94233, content=加强新技术研发.为国民服务, beContent=null, objectType=article, channel=null, level=null, likeNumber=48, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/10/21/9461f3b3c9f14e1d844256cdd08f2cf3.jpg, createdBy=a30f1426910, createdName=swfzhanggui, createdTime=Thu Nov 02 05:39:31 CST 2017, time=2017-11-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=257931, encodeId=3e8225e9315a, content=厉害了我的哥, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/oLAjfB7s1ib3IzoRn621JdKCFUI4XvNELcibocrAVU6aUzEVDSaf3rYH08PUYUiagGqxAEhj8g9WqqNvD1CupIpCrmnR2OrqHZh/0, createdBy=7f181365728, createdName=飛歌, createdTime=Thu Nov 02 02:27:07 CST 2017, time=2017-11-02, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=257919, encodeId=d5ce25e919b4, content=原来是通过mirna, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://cdnapi.center.medsci.cn/medsci/head/2017/04/28/37a322fa6e8be63db9e493f1c35a800a.jpg, createdBy=e5461842402, createdName=llaq, createdTime=Thu Nov 02 00:23:07 CST 2017, time=2017-11-02, status=1, ipAttribution=)]
    2017-11-02 swfzhanggui

    加强新技术研发.为国民服务

    0

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    2017-11-02 飛歌

    厉害了我的哥

    0

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    2017-11-02 llaq

    原来是通过mirna

    0

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