STM:科学新突破:血检检测能更早的检测出一系列癌症

2017-08-19 白木清水 来宝网

一项新的研究表明,一项新的基于基因的血液检测可能为检测早期癌症的发现铺平了道路,而癌症往往在被发现已经为时太晚,危及我们的生命。



一项新的研究表明,一项新的基于基因的血液检测可能为检测早期癌症的发现铺平了道路,而癌症往往在被发现已经为时太晚,危及我们的生命。

该研究的首席研究员Victor Velculescu解释说,这项测试扫描了癌症肿瘤释放的DNA片段

位于巴尔的摩的约翰霍普金斯大学癌症研究中心的癌症生物学主任Velculescu说,通过对58个“癌症驱动”基因中发现的突变的DNA片段进行检查,血液检测可以检测许多早期癌症而不会对健康人造成假阳性。

研究人员发现,在对200名先前诊断为癌症的患者进行评估时,测试发现了1到2个结肠、乳腺癌肺癌卵巢癌之间的关系。

Velculescu说:“如果我们能够早点发现癌症,我们拯救生命的机会就会高得多。”这些癌症的晚期和早期疾病之间的生存差异,每年在全世界影响超过一百万人的生命。”

这项测试也被证明能够筛检出癌症患者。

美国癌症协会的副首席医疗官Len Lichtenfeld博士称这是“重要的研究”,“让我们进一步研究出一种可能会发现癌症的血液测试。”

“我们仍然需要提高灵敏度,但这是向前迈出的一步。这是一个新的证明,”Lichtenfeld说。“这不是一项即将在临床实验室获得的测试。”

Velculescu解释说,为了开发癌症遗传血液检测,研究人员必须找到发现与癌症相关的DNA突变的方法,同时忽略常常发生在人体中的自然和无害突变。

Lichtenfeld和他的团队开发了一种基因扫描,本质上“在这里提取一个碎片和一个碎片,并利用它创造出肿瘤DNA的样子,”Velculescu说。“这就是它如此神奇的原因。”

研究小组组建了一个由58个与癌症相关的基因组成的小组,并利用他们的扫描结果在200名已知患有癌症的患者的血液中寻找肿瘤DNA片段。

总的来说,研究人员在第一阶段和第二阶段发现了62%的癌症。

该试验明确发现早期结肠癌占71%,乳腺癌和肺癌占59%,卵巢癌占68%。

Lichtenfeld说,能够识别早期卵巢癌的能力是特别需要的。只有不到五分之一的卵巢癌患者在早期被发现,而5年生存率超过90%。他说,大多数是在它们传播后被发现的,到那时,5年生存率的概率是40%或更低。

Lichtenfeld说:“在一个阶段的卵巢癌患者中找到任何标记是非常重要的,因为这是一个通常在后期阶段出现的肿瘤。”

研究人员还直接检测了200名癌症患者中一半的癌变组织。他们发现,82%的肿瘤中含有与人血液中发现的DNA片段相关的突变。

为了检查血液测试是否能清除健康人,研究人员还分析了44名没有患癌症的志愿者的血液。没有假阳性发生。

Velculescu说,这相当于超过350万份DNA序列的假阳性结果,因为每一个单独的测试都需要对8万个基因筛选小组的8万个DNA碱基对进行评估。

尽管这些有希望的结果,研究人员需要验证大型研究中的血液检测,Velculescu说。

Lichtenfeld还说,还需要做更多的工作来提高检测率。他说:“这些测试无法检测出百分之百的癌症。”

最后,癌症医生必须讨论当技术发展到这样的情况下,这样的测试会定期发现不会危及生命的肿瘤,Lichtenfeld说。在某些情况下,消除癌症的治疗可能比单独治疗更糟糕。

Lichtenfeld说:“重要的是要能够区分那些可能会伤害人们和癌症的癌症,而这些癌症可能不会对生存产生长期影响。”

原始出处:

Jillian Phallen, Mark Sausen, Vilmos Adleff, et al. Direct detection of early-stage cancers using circulating tumor DNA. Science Translational Medicine  16 Aug 2017: Vol. 9, Issue 403, eaan2415.DOI: 10.1126/scitranslmed.aan2415.

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    2017-10-12 gdsun
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    2018-04-08 zxxiang
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    2017-08-27 suibian2007bbb

    学习

    0

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    2017-08-21 䖝二

    优秀

    0

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    2017-08-21 Luyuxie_11
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    2017-08-21 1e10c84am36(暂无匿称)

    文章很好,赞赞赞

    0

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    2017-08-20 飛歌

    学习了很有用

    0

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