JNCI;建议对三阴性乳腺癌进行多基因遗传肿瘤panel检测

2018-08-12 肿瘤咨询编辑部 肿瘤资讯

采用遗传肿瘤基因panel检测胚系突变可以发现乳腺癌的高风险人群。然而,与三阴性乳腺癌(TNBC)发表风险相关的基因目前尚未明确,除BRCA1突变外,尚未确立其他的易感基因。近日,发布在JNCI的一项研究旨在确定与TNBC高风险相关的基因检测panel。

采用遗传肿瘤基因panel检测胚系突变可以发现乳腺癌的高风险人群。然而,与三阴性乳腺癌(TNBC)发表风险相关的基因目前尚未明确,除BRCA1突变外,尚未确立其他的易感基因。近日,发布在JNCI的一项研究旨在确定与TNBC高风险相关的基因检测panel。

背景

TNBC是一类侵袭性较强的乳腺癌,在高加索人群中约占所有乳腺癌患者的15%;在非裔美国人中,约占所有乳腺癌患者的35%。TNBC诊断时更高比例患者为晚期疾病,肿瘤分级高,相比于其他类型乳腺癌,复发风险更高,5年生存率更差。目前对于TNBC患者进行遗传肿瘤panel检测非常常见,因为在TNBC患者中,BRCA1/2突变绿较高,且5%的患者可能携带非BRCA1/2相关的遗传易感基因。NCCN指南推荐满足遗传学乳腺癌和卵巢癌检测标本的患者以及年龄60岁或以下的TNBC患者进行BRCA1/2检测。然而,针对其他与TNBC发病相关的易感基因检测,目前尚无明确推荐。因此,明确与TNBC发病风险相关的基因变异,可以帮助我们确立对于TNBC患者应该检测的基因,也有助于对这类高风险或已经发病人群进行更好的管理。本研究对两个TNBC队列患者进行胚系基因检测,并预估21个易感基因致病性变异与TNBC发病风险的相关性。

方法

本研究按入10901例TNBC患者,其中8753例来自临床检测实验室中参加临床胚系肿瘤panel检测的患者。另外2148例患者来自既往一项关于TNBC联盟(TNBCC)进行的一个17个基因panel检测的患者。临床检测队列中进行了下面21个基因的胚系突变检测,包括BRCA1, BRCA2, PALB2, BARD1, BRIP1, NF1, MSH2, MSH6, PMS2, CDKN2A, RAD51C, RAD51D, RAD50, NBN, MRE11A, ATM, CHEK2, TP53, PTEN, STK11和CDH1。TNBCC的患者进行了下列17个易感基因的检测,包括BRCA1, BRCA2, PALB2, BARD1, BRIP1, RAD51C, RAD51D, RAD50, NBN, MRE11A, XRCC2, ATM, CHEK2, TP53, PTEN, STK11和CDH1。

结果

入组患者的特征

临床队列中的8753例患者,5498例(62.8%)为高加索人群,1271(14.5%)为非裔美国人。TNBCC队列中,2095例(97.5%)为高加索人群。两个队列中患者诊断为乳腺癌的中位年龄分别为49.8和50.8岁,分别为51.9%和21.9%的患者自诉有一级或二级亲属罹患乳腺癌,见下表1.

表1. 研究入组患者的特征



采用panel检测发现的致病性变异

在临床队列中, 21个基因中检测到的致病性变异的发生率,在任意种族患者中为14.4%(BRCA1/2 8.4%,非BRCA 6.0%);在高加索人群中为14.0%(BRCA1/2 7.8%,非BRCA 6.2%);在非裔美国人为14.6%(BRCA1/2 9.0%,非BRCA 5.6%)。在2148例TNBCC队列患者中,17个基因中致病性变异的发生率为14.5%(BRCA1/2 10.4%,非BRCA 4.0%)。两个队列患者中,非BRCA1/2相关的变异,最常见的PALB2(1.0-1.6%)和BARD1(0.5-0.7%),见下表2.

表2. 所有种族人群中,TNBC患者基因变异发生率



致病性变异和TNBC的关系

研究对比了两个TNBC队列和ExAC NFE non-TCGA参照组患者,结果显示BRCA1致病性变异与更高的TNBC发病风险相关,这与既往研究结果相似,见表3. 与之相似,BRCA2的致病性变异也有更高的TNBC乳腺癌风险相关,在临床队列和TNBCC队列中均得到验证,OR分别为5.42和6.33,见下表3. 此外,PALB2,BARD1和RAD51D基因的致病性变异均与临床队列中TNBC更高的发病风险相关,OR分别为14.41,5.92和6.97,见表3. BRIP1和RAD51C基因的致病性变异,既往已经被排除为TNBC易感基因,与TNBC发病风险中等相关,OR>2.

表3. 高加索人群中与遗传学肿瘤基因panel突变相关的TNBC风险



此外,相比于非TNBC患者,BRCA1,RAD51C和RAD51D基因的致病性变异在TNBC乳腺癌中发生率高出3倍,这就提示这些基因是主要的TNBC易感基因,见下表4. 此外,PALB2和BRCA2变异也在TNBC中观察到显著更高的富集。

表4. 高加索人群中相比于非TNBC患者,TNBC的突变富集基因



非裔美国人中TNBC的致病性变异

TNBC的致病性变异在1271例非裔美国人中的发生率为12.7%,包括3.7%的非BRCA基因变异。非裔美国TNBC和高加索TNBC致病性变异的发生率无显著差异。一项探索性的病例对照分析显示,临床队列中的非裔美国TNBC患者相比于gnomAD-AFR参照组,BRCA1,BRCA2,BARD1和PALB2基因的致病性变异与高或中等的TNBC发病风险相关。

根据患者的发病年龄和家族史分析致病性变异发生率

TNBC的临床队列和TNBCC队列中,中等风险和高风险TNBC基因的致病性变异发生率分别为12.0%和13.2%。不同发病年龄组和罹患乳腺癌或卵巢癌的亲属数目不同,致病性变异的发生率存在显著差异,见表5. 例如诊断年龄为60岁以上,且无家族史的TNBC患者,致病性变异发生率为5%;而诊断年龄为35岁以下,且有家族史的TNBC患者,致病性变异发生率高达35.3%,见表5. 其中BRCA1突变在早发TNBC患者中突变率较高,而其他TNBC基因在迟发性TNBC中变异率较高。

表5. 根据患者的发病年龄和家族史分析致病性变异发生率



乳腺癌和TNBC的绝对风险估计

当联合分析临床队列中高加索人TNBC的OR和SEER数据库中年龄调整的亚组特异性发生率,BRCA1和PALB2 致病性变异分别与引发18%和10%的一生罹患TNBC风险,BARD1,BRCA2和RAD51D变异相关的TNBC发病风险分别为7%,6%和5%,见下图1.



图1. 预估的乳腺癌和TNBC绝对发病风险

结论和讨论

总体而言,本研究发现了一些TNBC的易感基因,与更高的TNBC发病风险和总体乳腺癌发病风险相关。这一研究结果提示,所有的TNBC患者应该接受多基因panel检测,无论其发病年龄和有无癌症家族史。一方面可以更好的评估癌症发病风险,另外也为潜在靶向治疗提供思路。

原始出处:
Hermela Shimelis, et al. Triple-Negative Breast Cancer Risk Genes Identified by Multigene Hereditary Cancer Panel Testing . JNCI: Journal of the National Cancer Institute. Aug 2018.

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    2019-07-13 syscxl
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    2019-07-21 vividelife
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  5. [GetPortalCommentsPageByObjectIdResponse(id=1754441, encodeId=df5e1e54441eb, content=<a href='/topic/show?id=44e2431e1c6' target=_blank style='color:#2F92EE;'>#多基因#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=31, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=43171, encryptionId=44e2431e1c6, topicName=多基因)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=b34b36693912, createdName=syscxl, createdTime=Sat Jul 13 18:20:00 CST 2019, time=2019-07-13, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1933744, encodeId=6a461933e4411, content=<a href='/topic/show?id=71a81258504' target=_blank style='color:#2F92EE;'>#NCI#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12585, encryptionId=71a81258504, topicName=NCI)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=0ee7414, createdName=lanyan20020086, createdTime=Sun Sep 16 23:20:00 CST 2018, time=2018-09-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1786085, encodeId=d5e11e86085a8, content=<a href='/topic/show?id=e27d13e1792' target=_blank style='color:#2F92EE;'>#panel#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13717, encryptionId=e27d13e1792, topicName=panel)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c279140, createdName=vividelife, createdTime=Sun Jul 21 01:20:00 CST 2019, time=2019-07-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2047986, encodeId=7c01204e98629, content=<a href='/topic/show?id=12e49e53102' target=_blank style='color:#2F92EE;'>#阴性乳腺癌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=97531, encryptionId=12e49e53102, topicName=阴性乳腺癌)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f65b226, createdName=circumcision, createdTime=Fri May 24 10:20:00 CST 2019, time=2019-05-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=338860, encodeId=b52a33886078, content=学习学习谢谢, beContent=null, objectType=article, channel=null, level=null, likeNumber=78, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=http://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTLbTp9nZtjwVrSZNxAXbAicnKQWnic2eBdJUQYhxO36XdkstSicr7FVF8p5ReH4omtmsbnLdvZLiaJJ1A/132, createdBy=8bff2327056, createdName=kafei, createdTime=Thu Aug 16 01:25:54 CST 2018, time=2018-08-16, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1458707, encodeId=b73b1458e078e, content=<a href='/topic/show?id=3ef91982030' target=_blank style='color:#2F92EE;'>#三阴性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=42, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=19820, encryptionId=3ef91982030, topicName=三阴性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=a5666112721, createdName=xlysu, createdTime=Tue Aug 14 13:20:00 CST 2018, time=2018-08-14, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=338209, encodeId=b511338209b1, content=学习了,谢谢分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=77, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=7c592194322, createdName=1209e435m98(暂无昵称), createdTime=Sun Aug 12 23:51:34 CST 2018, time=2018-08-12, status=1, ipAttribution=)]
    2018-08-16 kafei

    学习学习谢谢

    0

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    2018-08-14 xlysu
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    2018-08-12 1209e435m98(暂无昵称)

    学习了,谢谢分享

    0

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两篇Science!施一公、颜宁课题组发表“结构生物学”最新成果;震惊!乳腺癌细胞早在胎儿细胞期就已“埋下伏笔”;为改善心脏健康,Nature子刊:给肠道菌“下药”;辨色识癌!MIT这种新技术可有效预测化疗药效果;Nature子刊颁布CAR-T疗法指南,关联儿童急性淋巴细胞白血病;重磅!两篇Nature共同揭示:新型肺细胞…………更多资讯,请跟随小编一起回顾吧。

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