HER-2与抗-EGFR治疗——HER-2与转移性结直肠癌(二)

2017-08-04 佚名 肿瘤资讯

HER-2与抗-EGFR治疗——HER-2与转移性结直肠癌(二)



HER-2高表达:抗EGFR治疗不敏感

在2011年HERACLES研究团队的Trusolino等学者,开始了对转移性结直肠癌中抗HER2治疗的研究。他们取了85例mCRC患者的标本建立PDX(direct transfer xenografts)模型,观察给药后小鼠肿瘤生长状况。

结果显示在KRAS野生型患者中,HER-2激活突变比率为13.6%(4/44)RAS全野生患者, HER-2激活突变比率为36.4%(4/11)。

RAS全野生型48例。其中HER2+ 4例,均在接受CET治疗后出现PD(4/11)。HER2几乎只在全RAS野生型患者中高表达,且HER2高表达患者,对抗EGFR治疗不敏感。


随后的药敏试验,研究人员从4例CET治疗失败的PDX中选取2例,选择不同的化疗方案。发现联合抗HER2治疗的方案有效性显着提高。


机制:HER2激活-MAPK持续磷酸化

那么到底为什么会出现HER2高表达导致抗EGFR耐药的情况呢?该研究团队又在2015年的Cancer Discovery上发表了其研究成果。首先,研究团队在结肠癌细胞系上,转染了六种不同的HER2扩增突变基因,建立了六种HER2激活突变稳转细胞系。然后在细胞系上进行抗EGFR治疗,结果发现接受抗-EGFR治疗细胞生长速度无明显下降。

Western的结果显示,对这些细胞系进行不同浓度的抗-EGFR治疗,HER2高水平的表达会导致持续激活下游MAPK磷酸化,促进细胞增殖,因此单独的抗EGFR治疗对HER-2高表达无效。


随后,研究人员对细胞系进行抗HER2治疗,结果显示,对HER2激活突变的细胞系进行抗HER2治疗,下游MAPK磷酸化明显抑制,细胞增殖速度下降。

PDX药敏试验的结果亦显示,将4例存在HER2的激活突变且抗-EGFR治疗失败的RAS野生患者(4/48)的标本植入小鼠PDX模型,进行抗HER2治疗。发现双药抗HER2治疗(trastuzumab plus tyrosine kinase inhibitors)能使之产生最大肿瘤退缩。


总结来看HER2激活,能够使下游MAPK持续磷酸化,促进细胞增殖,因此单独的抗EGFR治疗只能抑制EGFR引起的下游信号,而无法抑制HER-2高表达所引起的下下游信号。因此单独的抗EGFR治疗对HER-2高表达无效。这些数据为HER2激活突变的mCRC患者临床试验提供了强有力的证据。

HER-2表达水平影响抗EGFR治疗决策

最后另外一项研究来自于瑞士和意大利的合作。研究人员分析了2004-2010年间170例接受过抗EGFR治疗的KRAS野生型mCRC患者。通过HER2的FISH检测,将全组患者划分为HER2阴性表达组,HER2弱阳性表达组,HER2强阳性表达组。结果发现,HER2强阳性和HER2阴性表达的患者,CET反应最差;HER2强阳性的患者,长期生存最差,而生存最好的反而是HER2弱阳性表达的患者。

研究解释该结果为:如前所述,当HER2为强阳性时,此时靠刺激HER2引起的下游通路够强,压制了EGFR所引导的生长反应,因此此时给予抗EGFR治疗只是单纯的遏制了EGFR所引起的生长反应,所以CET治疗效果较差;HER2弱阳性时,此时HER2和EGFR的水平处于相当状态,甚至EGFR水平更高一些,此时由HER2引起的细胞增殖较弱,所以使用CET往往效果较好;HER2阴性患者,往往也都伴有EGFR的表达水平降低,而且此时往往除了HER2和EGFR以外的其它促生长因子处于高水平表达状态,因此CET治疗效果差。
因此文章提出了一个抗HER2治疗的流程图:对于HER2高表达的患者,往往抗CET治疗失败,且预后不好,因此建议抗HER2治疗;当HER2阴性表达时,抗EGFR治疗也容易失败,因此建议换用其他治疗方案;当HER2弱阳性性表达时,此时接受抗-EGFR治疗效果最佳。

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    2017-09-03 jyzxjiangqin

    HER_2与转移性结直肠癌.

    0

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    2017-08-06 zhu_jun9840
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    2017-08-06 liuyiping
  6. [GetPortalCommentsPageByObjectIdResponse(id=239943, encodeId=ac8d239943d5, content=HER_2与转移性结直肠癌., beContent=null, objectType=article, channel=null, level=null, likeNumber=97, 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=Sun Sep 03 07:32:01 CST 2017, time=2017-09-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1386264, encodeId=7fca13862649a, content=<a href='/topic/show?id=f08293399f9' target=_blank style='color:#2F92EE;'>#转移性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=93399, encryptionId=f08293399f9, topicName=转移性)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=1ac22500003, createdName=1249842em09(暂无昵称), createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1452947, encodeId=1a51145294ec5, content=<a href='/topic/show?id=098ee8679ad' target=_blank style='color:#2F92EE;'>#结直肠#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78679, encryptionId=098ee8679ad, topicName=结直肠)], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=9ace5575596, createdName=crystal0564, createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1495797, encodeId=83141495e97f0, content=<a href='/topic/show?id=27eb8e1381' target=_blank style='color:#2F92EE;'>#HER-2#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8713, encryptionId=27eb8e1381, topicName=HER-2)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6b8b9208832, createdName=zhu_jun9840, createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534317, encodeId=fe90153431e7b, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=230351, encodeId=33c723035108, content=HER2强阳性和HER2阴性表达的患者,CET反应最差;HER2强阳性的患者,长期生存最差,而生存最好的反而是HER2弱阳性表达的患者。, beContent=null, objectType=article, channel=null, level=null, likeNumber=81, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/08/02/7354b3539aae6a0ccb1e0fff04c12084.jpg, createdBy=205b1984786, createdName=随梦飞扬, createdTime=Sat Aug 05 12:14:25 CST 2017, time=2017-08-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=229968, encodeId=735922996891, content=非常好的文章,学习了,很受益, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7LIiaRZTzJ3SEfiauCzTMPW7YvPPYLNJBXG9oh6Al1icq2VQQkIHWxqXehcicTS62YKJVBhxeth3wggw/0, createdBy=7ce01621306, createdName=天涯183, createdTime=Fri Aug 04 14:25:53 CST 2017, time=2017-08-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=229943, encodeId=24a2229943ae, content=学习了新知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=83, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20201006/4db877c2887649beb09cb5effd0b38c7/916f66edd48a4e77b20ebc3e14b6e45c.jpg, createdBy=141e1980133, createdName=Y—xianghai, createdTime=Fri Aug 04 10:52:27 CST 2017, time=2017-08-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=229923, encodeId=bed6229923e4, content=学习了,涨知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=78, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20220115/46bcf39c32de4aa6b45c5f9d66c8ee77/6cb4a20c55bb4b7691122f47747bfca2.jpg, createdBy=9dad1662329, createdName=1ddf0692m34(暂无匿称), createdTime=Fri Aug 04 10:35:48 CST 2017, time=2017-08-04, status=1, ipAttribution=)]
    2017-08-05 随梦飞扬

    HER2强阳性和HER2阴性表达的患者,CET反应最差;HER2强阳性的患者,长期生存最差,而生存最好的反而是HER2弱阳性表达的患者。

    0

  7. [GetPortalCommentsPageByObjectIdResponse(id=239943, encodeId=ac8d239943d5, content=HER_2与转移性结直肠癌., beContent=null, objectType=article, channel=null, level=null, likeNumber=97, 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=Sun Sep 03 07:32:01 CST 2017, time=2017-09-03, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1386264, encodeId=7fca13862649a, content=<a href='/topic/show?id=f08293399f9' target=_blank style='color:#2F92EE;'>#转移性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=51, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=93399, encryptionId=f08293399f9, topicName=转移性)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=1ac22500003, createdName=1249842em09(暂无昵称), createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1452947, encodeId=1a51145294ec5, content=<a href='/topic/show?id=098ee8679ad' target=_blank style='color:#2F92EE;'>#结直肠#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=78679, encryptionId=098ee8679ad, topicName=结直肠)], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=9ace5575596, createdName=crystal0564, createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1495797, encodeId=83141495e97f0, content=<a href='/topic/show?id=27eb8e1381' target=_blank style='color:#2F92EE;'>#HER-2#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=43, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8713, encryptionId=27eb8e1381, topicName=HER-2)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6b8b9208832, createdName=zhu_jun9840, createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534317, encodeId=fe90153431e7b, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Sun Aug 06 01:15:00 CST 2017, time=2017-08-06, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=230351, encodeId=33c723035108, content=HER2强阳性和HER2阴性表达的患者,CET反应最差;HER2强阳性的患者,长期生存最差,而生存最好的反而是HER2弱阳性表达的患者。, beContent=null, objectType=article, channel=null, level=null, likeNumber=81, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/08/02/7354b3539aae6a0ccb1e0fff04c12084.jpg, createdBy=205b1984786, createdName=随梦飞扬, createdTime=Sat Aug 05 12:14:25 CST 2017, time=2017-08-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=229968, encodeId=735922996891, content=非常好的文章,学习了,很受益, beContent=null, objectType=article, channel=null, level=null, likeNumber=0, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7LIiaRZTzJ3SEfiauCzTMPW7YvPPYLNJBXG9oh6Al1icq2VQQkIHWxqXehcicTS62YKJVBhxeth3wggw/0, createdBy=7ce01621306, createdName=天涯183, createdTime=Fri Aug 04 14:25:53 CST 2017, time=2017-08-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=229943, encodeId=24a2229943ae, content=学习了新知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=83, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20201006/4db877c2887649beb09cb5effd0b38c7/916f66edd48a4e77b20ebc3e14b6e45c.jpg, createdBy=141e1980133, createdName=Y—xianghai, createdTime=Fri Aug 04 10:52:27 CST 2017, time=2017-08-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=229923, encodeId=bed6229923e4, content=学习了,涨知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=78, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20220115/46bcf39c32de4aa6b45c5f9d66c8ee77/6cb4a20c55bb4b7691122f47747bfca2.jpg, createdBy=9dad1662329, createdName=1ddf0692m34(暂无匿称), createdTime=Fri Aug 04 10:35:48 CST 2017, time=2017-08-04, status=1, ipAttribution=)]
    2017-08-04 天涯183

    非常好的文章,学习了,很受益

    0

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    2017-08-04 Y—xianghai

    学习了新知识

    0

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    2017-08-04 1ddf0692m34(暂无匿称)

    学习了,涨知识

    0

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