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Science:一种液体活检技术能早期发现八大常见肿瘤

2018-02-15 MedSci MedSci

《科学》杂志发表了重磅研究,液体活检再次刷屏。美国约翰斯·霍普金斯大学研究者研发了一种名为CancerSEEK的液体活检技术,可同时对八大常见肿瘤进行早期检测,中位敏感性达到70%,特异性达99%以上。 浑身都是闪光点 关键是这八大肿瘤中五种目前没有早期检测手段,利用CancerSEEK检测敏感性非常高,对卵巢癌的敏感性高达98%!关键是CancerSEEK不仅能检测肿

    《科学》杂志发表了重磅研究,液体活检再次刷屏。美国约翰斯·霍普金斯大学研究者研发了一种名为CancerSEEK的液体活检技术,可同时对八大常见肿瘤进行早期检测,中位敏感性达到70%,特异性达99%以上。

    图片13.jpg

    浑身都是闪光点

    关键是这八大肿瘤中五种目前没有早期检测手段,利用CancerSEEK检测敏感性非常高,对卵巢癌的敏感性高达98%!关键是CancerSEEK不仅能检测肿瘤,还能准确判断瘤种,这是以往液体活检想都不敢想的!

    关键是它还便宜,研究者预计CancerSEEK成本不高于500美金,不高于任何现有的肿瘤检测方法,适用于大范围筛查,跟结肠镜和钼靶相比又便宜又便捷,真是牛得不要不要的!

    16种基因+8种蛋白

    研究者在最初选取的几百个基因和41个蛋白基础上进行了精简,最终锁定了16种肿瘤相关基因和8个肿瘤特异性蛋白,用计算机算法对结果进行分析。

    显然,这是非常明智的决定。因为并不是选取的检测对象越多越好,随着检测对象数量增加,敏感性确有提高但并无额外益处,成本上去了,特异性下来了。精简基因突变检测数量很重要,有利于将假阳性率和检测费用控制到最低。

    CancerSEEK检测第一步是对16种肿瘤相关基因突变的检测,第二步是检测八种蛋白标志物。因为早期肿瘤并不能释放足够的可检出的循环肿瘤DNA(ctDNA),即使最敏感的检测方法也不能将其检出。

    这八种蛋白分别为CA125、CEA、CA19-9、催乳素(PRL)、肝细胞生长因子(HGF)、骨桥蛋白(OPN)、髓过氧化物酶(MPO)、基质金属蛋白酶1(TIMP-1),八大金刚。

    图片15.jpg

    特异性和敏感性俱佳

    结果很是令人惊艳,对812名无肿瘤病史的健康人群的检测中,这一检测的特异性在99%以上,只有7名健康对照者检测结果阳性,研究者指出,这7名检测阳性者搞不好也有肿瘤,只是临床上还未检出。而已经全民推广的常见肿瘤筛查中,如乳房X线摄影假阳性率都在10%。

    至于敏感性,研究者用CancerSEEK检测了1005例肿瘤患者血标本,这些患者患Ⅰ~Ⅲ期卵巢癌肝癌胃癌胰腺癌、食道癌、结直肠癌肺癌乳腺癌,肿瘤都没有转移,也未接受过化疗。这八大肿瘤贡献了美国近60%的肿瘤死亡病例,且前五种肿瘤目前没有有效的早检方法。

    这1000余例患者中位年龄64岁,Ⅰ期患者占20%,Ⅱ期患者49%,Ⅲ期患者31%。有一种基因突变和/或蛋白表达异常即为阳性。CancerSEEK检测对Ⅱ期患者的中位敏感性为73%,对Ⅲ期患者为78%,对Ⅰ期患者为43%。Ⅰ期肿瘤中,这一检测对肝癌的敏感性最高,达100%,最食管癌的敏感性最低,为20%。总体敏感性最高的是卵巢癌,为98%,乳腺癌最低,为33%。卵巢癌肝癌胃癌胰腺癌食管癌这五种尚无有效早检手段的肿瘤中,CancerSEEK检测的敏感性在69%~98%。

    还能判断瘤种

    CancerSEEK还有一个过人之处就是能判断瘤种,许多基因突变在多种肿瘤中都存在,很难通过基因检测判断患的是哪种肿瘤,但因为CancerSEEK同时还检测了蛋白,这八种蛋白和另外39种蛋白的检测结果综合性别进行判断。这使63%的患者可精准确定是哪个系统的肿瘤,83%的患者可将肿瘤病灶锁定在两个之内,只需进一步检查就能明确诊断


    还需进一步完善

    这一技术距离投放市场还得几年时间,真到那个时候,检测肿瘤就会变得很简单,到医院抽个血查个血常规似的。不过寄希望于毕其功于一役,用这种检测检出所有肿瘤显然不可能,在真实世界验证这一检测的有效性也需要一个过程,这种检测对早期肿瘤的检出率只有43%,真用到一般人群中还能不能有效果不好说,因为健康人血中ctDNA就更少了。

    研究选取的是健康对照,一般人群中可能还有良性病变和炎症患者,血中蛋白水平也会有变化,因此假阳性率是研究者下一步的重点研究方向。研究者计划开展大样本检测,5年内对5万名女性进行CancerSEEK检测,对假阳性率不到1%这一数据进行验证。

    还有,得出结论的数据库,也用来作验证数据集,用独立验证数据集会更好一些。即使获得验证,也还需要开展针对一般人群的前瞻性临床研究,验证这一检测的有效性,验证其是否真可改善肿瘤患者生存。这些都提示,这一检测不尽善尽美,还需要完善,当然这种检测还是可能改观我们的肿瘤 查。

    原始出处:

    Cohen JD, Li L, Wang Y, Thoburn C, Afsari B, Danilova L, Douville C, Javed AA, Wong F, Mattox A, Hruban RH, Wolfgang CL, Goggins MG, Dal Molin M, Wang TL, Roden R, Klein AP, Ptak J, Dobbyn L, Schaefer J, Silliman N, Popoli M, Vogelstein JT, Browne JD, Schoen RE, Brand RE, Tie J, Gibbs P, Wong HL, Mansfield AS, Jen J, Hanash SM, Falconi M, Allen PJ, Zhou S, Bettegowda C, Diaz LA Jr., Tomasetti C, Kinzler KW, Vogelstein B, Lennon AM, Papadopoulos N. Detection and localization of surgically resectable cancers with a multi-analyte blood test. Science. 2018 Jan 18. pii: eaar3247. doi: 10.1126/science.aar3247


    Killock D. Diagnosis: CancerSEEK and destroy - a blood test for early cancer detection. Nat Rev Clin Oncol. 2018 Feb 6. doi: 10.1038/nrclinonc.2018.21

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    2018-02-20 yfjms

    学习

    0

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    2018-02-19 1e17414fm02(暂无匿称)

    学习

    0

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    2018-02-17 smlt2008
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  6. [GetPortalCommentsPageByObjectIdResponse(id=1988834, encodeId=53f8198883458, content=<a href='/topic/show?id=6e526589085' target=_blank style='color:#2F92EE;'>#液体活检技术#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=71, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65890, encryptionId=6e526589085, topicName=液体活检技术)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b79433, createdName=jiangjun073, createdTime=Fri Jun 22 05:58:00 CST 2018, time=2018-06-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=289433, encodeId=5c0028943377, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=127, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c3da1990174, createdName=yfjms, createdTime=Tue Feb 20 11:29:17 CST 2018, time=2018-02-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=289122, encodeId=127b2891224a, content=学习, beContent=null, objectType=article, channel=null, level=null, likeNumber=104, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/mStl88fu4NfDEeydJz0GlP8O0ngrUX6AYCXFic0XDOOAyeQicIqnOd4TrWSwiagJrsFNYuWC1Uc6iavbS1hWt9xtZAhAqLGHqZyl/0, createdBy=42891977006, createdName=1e17414fm02(暂无匿称), createdTime=Mon Feb 19 08:55:46 CST 2018, time=2018-02-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1278073, encodeId=d10c12e80736a, content=<a href='/topic/show?id=d34e6523544' target=_blank style='color:#2F92EE;'>#活检#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65235, encryptionId=d34e6523544, topicName=活检)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c39f145, createdName=smlt2008, createdTime=Sat Feb 17 02:58:00 CST 2018, time=2018-02-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1331300, encodeId=9790133130057, content=<a href='/topic/show?id=35e7593559a' target=_blank style='color:#2F92EE;'>#早期发现#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=59355, encryptionId=35e7593559a, topicName=早期发现)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=9cb02500048, createdName=ms6832696159214430, createdTime=Sat Feb 17 02:58:00 CST 2018, time=2018-02-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1375766, encodeId=993713e57663a, content=<a href='/topic/show?id=2949159989d' target=_blank style='color:#2F92EE;'>#SCIE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15998, encryptionId=2949159989d, topicName=SCIE)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=17a3387, createdName=jichang, createdTime=Sat Feb 17 02:58:00 CST 2018, time=2018-02-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=288325, encodeId=8a3228832561, content=学习了.谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=120, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7c592194322, createdName=1209e435m98(暂无昵称), createdTime=Fri Feb 16 07:12:31 CST 2018, time=2018-02-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=288198, encodeId=e9272881983f, content=学习了受益匪浅, beContent=null, objectType=article, channel=null, level=null, likeNumber=101, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/ajNVdqHZLLDicHg2ldsSNmib46PmdzpO7CQEmPjuULp1v45zPWwMYhrnXgvl3OtmUCZSQfgITWn96X9moL94nUGA/0, createdBy=28072041016, createdName=131****1460, createdTime=Thu Feb 15 15:56:08 CST 2018, time=2018-02-15, status=1, ipAttribution=)]
    2018-02-17 jichang
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    2018-02-16 1209e435m98(暂无昵称)

    学习了.谢谢分享

    0

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    2018-02-15 131****1460

    学习了受益匪浅

    0

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液体活检是转移性结直肠癌患者肿瘤组织RAS检测的替代方案。但是对于接受一线抗EGFR治疗的患者,液体活检RAS检测的预后效果几乎未见报道。ANN ONCOL近期发表了一篇文章,研究了这一问题。

王涛教授点评:液体活检,乳腺癌精准医疗的助力器

目前肿瘤的诊断、监测复发以及转移癌治疗监控,主要还是依靠组织学活检和影像学检查。但是组织学活检是有创操作,同一患者实现多次组织学活检更为困难。影像学检查会面临影像反应病情滞后问题。基于上述不能完全满足临床快捷、方便、损伤小、及时反应病情变化的需求,液体活检技术和理念脱颖而出。液体活检技术是精准检测工具的代表,目前主要包括循环肿瘤细胞(CTC)检测和循环肿瘤DNA检测(ctDNA)等应用于临床研究较

王洁教授:肺癌液体活检的进展和未来

现今晚期NSCLC已进入了以分子分型为基础的个体化精准靶向治疗时代,精准治疗首先需要精准的分子分型,但不是每个患者都可顺利获得合格的肿瘤组织标本,于是液态活检应运而生。回顾性研究证实血浆ctDNA EGFR突变与组织EGFR突变在指导NSCLC靶向治疗上具有较好的一致性。王洁教授主持的BENEFIT研究首次前瞻性证实了液体活检指导一线TKI疗效的可行性,血检阳性患者一线选择吉非替尼,ORR 72.

Lung cancer:液体活检T790M突变低丰度建议组织活检除外SCLC转化

液体活检常用于检测耐药突变,从而避免组织活检。但是仅分析循环游离DNA,可能会遗漏其他少见和共存的耐药机制。患者来自ASTRIS研究,为真实世界数据,一代EGFR TKI耐药后行组织或血液检测T790M突变阳性,使用奥希替尼80mg治疗。T790M检测手段为ddPCR。

液体活检技术将迎来全新时代

临床实践的推行,给大家带来了希望的曙光,众望所归的液体活检技术是否能够兴起,迎来全新的时代?

Science:一次血检可查八种癌症:液体活检时代真的来了?

霍普金斯Kimmel癌症中心的一项名为CancerSEEK的新型血液检测方法可以鉴定8种常见癌症:卵巢癌、肝癌、食道癌、胰腺癌、胃癌、结直肠癌、肺癌和乳腺癌。该成果于1月18日发表在Science杂志,并且作者估计该项检测的费用不会超过500美金,甚至低于目前对某单一癌种检测的费用,这是否意味着液体活检的时代已经来临??肿瘤咨询带您一探究竟。

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