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The Oncologist:Palbociclib治疗CDKN2A突变难治性子宫平滑肌肉瘤的疗效良好

2017-03-20 Emilyju 肿瘤资讯

Foundation Medicine公司对279例子宫平滑肌肉瘤(uLMS)病例进行全基因组测序分析(CGP),第一次报道了CDk4/6抑制剂palbociclib对CDK通路调节基因——CDKN2A突变患者的疗效。这一结果显示了CGP在靶向治疗的选择中的重要作用。由于接近20%的uLMS患者存在CDK通路的基因突变,这项研究为CDK通路抑制剂治疗uLMS的临床试验开展奠定了基础。子宫平滑肌

Foundation Medicine公司对279例子宫平滑肌肉瘤(uLMS)病例进行全基因组测序分析(CGP),第一次报道了CDk4/6抑制剂palbociclib对CDK通路调节基因——CDKN2A突变患者的疗效。这一结果显示了CGP在靶向治疗的选择中的重要作用。由于接近20%的uLMS患者存在CDK通路的基因突变,这项研究为CDK通路抑制剂治疗uLMS的临床试验开展奠定了基础。

子宫平滑肌肉瘤(uLMS)简介

子宫平滑肌肉瘤(uLMS)是最常见的子宫肉瘤,占子宫恶性肿瘤的1%-2%。这是一种子宫壁平滑肌来源的、恶性程度很高的罕见肿瘤,有很高的复发和转移风险,且常规化疗疗效较差。常规治疗方案为手术切除以及随后进行的辅助化疗,但是大多数患者复发。吉西他滨联合多西紫杉醇的随机Ⅱ期试验显示客观缓解率(ORRs)约为20%,无进展生存期中位数约为6个月,总生存期中位数约为18个月。Trabectedin或trabectedin联合阿霉素的新治疗方案可使ORRs提高至53%,但是生存率却没有显着改善。尽管美国FDA已经批准pazopanib用于软组织肉瘤治疗,uLMS的靶向治疗方案还是很有限。

Foundation Medicine公司对uLMS的CGP分析

美国马萨诸塞州剑桥市的Foundation Medicine公司对279例晚期或复发uLMS进行了全基因组测序(CGP)。具体方法为,从40μm福尔马林固定和石蜡包埋的切片中提取DNA,然后用基于杂交捕获和连接接头的文库进行CGP分析。对测序数据进行分析,找出临床相关的基因突变,包括碱基对取代、插入或缺失、拷贝数变化和重排。

CDKN2A与细胞周期的关系

CDKN2A编码两个不同的抑癌蛋白,p16INK4a和p14ARF,前者能够抑制CDK4和CDK6,因此能够维持Rb抑癌蛋白的肿瘤抑制活性,后者能够保持p53的活性。而CDKN2A突变会导致p16INK4a失活,从而导致CDK4/6-周期蛋白-Rb信号通路的失调,使得细胞周期失去控制。

uLMS中CDK4/6通路基因突变情况

分析结果表明,97.1%的uLMS有至少一种已知的或怀疑十分重要的突变,大约57%的uLMS有至少一种目前的治疗可靶向的通路中的突变(图1)。在uLMS中,最常见的突变是关键的抑癌基因TP53和RB1的突变,分别占66%和49%。在11%的uLMS,发现可导致p16INK4a蛋白失活的CDKN2A突变。大多数的CDKN2A突变是外显子的纯合性缺失(90%),其余为重排(7%)和短变种(3%)。大约6.8%的uLMS有CDKN2B突变,其中93%有共存的CDKN2A突变。另外影响到周期蛋白依赖性激酶通路的基因突变还包括CDKN2C、CDK4、CCND3、CCND2、CDNK1B和CCND1突变。总的说来,大约19%的uLMS至少有一种参与CDK4/6通路的基因的突变。与参与CDK通路的基因突变共存的RB1或TP53的突变明显少于预期。

CDK4/6抑制剂palbociclib治疗CDKN2A突变uLMS疗效良好

在Foundation Medicine公司所分析的uLMS病例中,有一名72岁患者的CGP分析显示CDKN2A突变。该患者曾在ⅡB期(T2bN0)接受过经腹子宫全切术、右侧输卵管卵巢切除术和淋巴结清除术。最初的病理分析显示瘤内有大量粘液样成分(图2)。这名患者接受了六个疗程的吉西他滨联合多西紫杉醇辅助化疗。大约10个月后被发现转移,有多个肠系膜肿块。然后,患者接受贝伐珠单抗治疗。然而患者在诊断后2年出现胃肠道出血,需要进行网膜肿瘤切除术。在转移瘤切除术后,患者接受了脂质体阿霉素治疗,在治疗6个月后疾病出现进展。然后患者参与了p53抑制剂AMG232的Ⅰ期临床试验,5个月后疾病出现进展。患者再次接受网膜肿瘤的转移瘤切除术,病理分析显示雌激素受体/孕激素受体阴性平滑肌肉瘤。之后给予两个疗程的异磷酰胺和紫杉醇治疗,疗效不佳且有严重的骨髓抑制。

在CGP分析显示CDKN2A突变后,患者开始接受CDK4/6抑制剂palbociclib治疗。Palbociclib是一种口服CDK4/6抑制剂,被批准用于雌激素受体阳性、人表皮生长因子受体2(HER2)阴性的转移性乳腺癌治疗。在接受palbociclib治疗前,CT显示患者至少有八个分离的肠系膜肿块,并且相比8周前有明显的疾病进展。Palbociclib的初始剂量为每月21天,每天125mg。由于出现严重的各类血细胞减少,将其剂量降至75mg。在治疗2个月和4个月进行CT扫描显示,疾病进入稳定状态,未出现新的肿块,且已有肿块有轻微的减小(图3)。患者的总体感觉得到明显改善,腹痛减轻,因此不再需要使用麻醉药物。当前,虽然患者已有的肿块有轻微增大,但是未出现新的肿块,palbociclib保持了良好疗效。

其它突变的治疗启示

在接近一半的uLMS中存在Rb的缺失,这可能导致对CDK4/6抑制剂的耐药,但是在Foundation Medicine公司进行的这279例uLMS分析中,CDK4/6通路突变和RB1突变共存的比例很小(图4)。

前文所分析的CDKN2A突变的72岁患者还有NF2的杂合性突变。这一突变没有影响palbociclib的疗效。一些临床证据表明,NF2失活使得肿瘤对mTOR抑制剂敏感,包括everolimus和temsirolimus。还有一些研究表明,NF2失活可能会增加肿瘤对pan-ERBB抑制剂lapatinib或MEK抑制剂trametinib和cobimetinib的敏感性。这些也为palbociclib以外的治疗选择提供了思路。

亮点总结:

uLMS的全基因组测序表明,接近20%的患者有周期蛋白依赖性激酶(CDK)通路上的基因突变。在这项分析中,CDKN2A突变的72岁患者从palbociclib治疗中受益,表明CDK抑制剂可能对这部分患者有良好的疗效。由于目前还缺少对uLMS有效的治疗方案,这项研究结果提示,可以对所有晚期uLMS患者进行全基因组测序分析。对于CDK通路上突变的患者,建议给予CDK抑制剂进行治疗(在临床试验中最好能够考虑这一选择)。


图1. uLMS中的突变概率。
图2. 患者T2bN0期显示大量粘液样成分。

图3. 患者肿瘤生长曲线。

图4. uLMS中CDK通路突变和其它突变共存的几率。

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    2017-03-22 zhouqu_8
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    2017-03-22 july_977
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    2017-03-22 freve
  7. [GetPortalCommentsPageByObjectIdResponse(id=1691676, encodeId=2e9b16916e635, content=<a href='/topic/show?id=8ed9488e37e' target=_blank style='color:#2F92EE;'>#平滑肌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=85, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=48873, encryptionId=8ed9488e37e, topicName=平滑肌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=4a5d29283334, createdName=shijzhiewnjhch, createdTime=Sun Mar 04 12:06:00 CST 2018, time=2018-03-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1864858, encodeId=1afa186485897, content=<a href='/topic/show?id=16ce133504e' target=_blank style='color:#2F92EE;'>#Oncol#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=109, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13350, encryptionId=16ce133504e, topicName=Oncol)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b63894, createdName=minlingfeng, createdTime=Tue Aug 29 10:06:00 CST 2017, time=2017-08-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1372316, encodeId=85ce13e2316a8, content=<a href='/topic/show?id=48cd1369065' target=_blank style='color:#2F92EE;'>#palbociclib#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13690, encryptionId=48cd1369065, topicName=palbociclib)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=96d4340, createdName=ysjykql, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1435492, encodeId=2bf2143549273, content=<a href='/topic/show?id=09dc439915' target=_blank style='color:#2F92EE;'>#CDK#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4399, encryptionId=09dc439915, topicName=CDK)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=zhouqu_8, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1455124, encodeId=13631455124f6, content=<a href='/topic/show?id=bebe8032fc' target=_blank style='color:#2F92EE;'>#GIST#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8032, encryptionId=bebe8032fc, topicName=GIST)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6e445632366, createdName=july_977, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1528337, encodeId=9521152833e91, content=<a href='/topic/show?id=74b798601a1' target=_blank style='color:#2F92EE;'>#难治性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=98601, encryptionId=74b798601a1, topicName=难治性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=a1ef11916292, createdName=freve, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=181892, encodeId=bf4a1818920f, content=文章很好,值得分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=157, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzdAIB7UwTkHt6fQkBP8ictliaXtc5gCUmYdAW1sAETC2nhO3q6YjRHkUibyOCtP8ibmXNObTyd63A076/0, createdBy=d4111948983, createdName=1e10c84am36(暂无匿称), createdTime=Wed Mar 22 08:31:04 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=181629, encodeId=5c1818162931, content=可以对所有晚期uLMS患者进行全基因组测序分析。对于CDK通路上突变的患者,建议给予CDK抑制剂进行治疗, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Tue Mar 21 09:15:47 CST 2017, time=2017-03-21, status=1, ipAttribution=)]
    2017-03-22 1e10c84am36(暂无匿称)

    文章很好,值得分享

    0

  8. [GetPortalCommentsPageByObjectIdResponse(id=1691676, encodeId=2e9b16916e635, content=<a href='/topic/show?id=8ed9488e37e' target=_blank style='color:#2F92EE;'>#平滑肌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=85, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=48873, encryptionId=8ed9488e37e, topicName=平滑肌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=4a5d29283334, createdName=shijzhiewnjhch, createdTime=Sun Mar 04 12:06:00 CST 2018, time=2018-03-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1864858, encodeId=1afa186485897, content=<a href='/topic/show?id=16ce133504e' target=_blank style='color:#2F92EE;'>#Oncol#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=109, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13350, encryptionId=16ce133504e, topicName=Oncol)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b63894, createdName=minlingfeng, createdTime=Tue Aug 29 10:06:00 CST 2017, time=2017-08-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1372316, encodeId=85ce13e2316a8, content=<a href='/topic/show?id=48cd1369065' target=_blank style='color:#2F92EE;'>#palbociclib#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13690, encryptionId=48cd1369065, topicName=palbociclib)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=96d4340, createdName=ysjykql, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1435492, encodeId=2bf2143549273, content=<a href='/topic/show?id=09dc439915' target=_blank style='color:#2F92EE;'>#CDK#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=58, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=4399, encryptionId=09dc439915, topicName=CDK)], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/aLGWoFXAyMbIu3qymFOyheQLjPSX3OUs5GmkyBlcCOwTPIeq3why9NGibxxUqYo6hcx8qZLHZFgNPnBK1yzWeOFpyg2OnWOt0/0, createdBy=fa4716, createdName=zhouqu_8, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1455124, encodeId=13631455124f6, content=<a href='/topic/show?id=bebe8032fc' target=_blank style='color:#2F92EE;'>#GIST#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=74, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=8032, encryptionId=bebe8032fc, topicName=GIST)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=6e445632366, createdName=july_977, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1528337, encodeId=9521152833e91, content=<a href='/topic/show?id=74b798601a1' target=_blank style='color:#2F92EE;'>#难治性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=98601, encryptionId=74b798601a1, topicName=难治性)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=a1ef11916292, createdName=freve, createdTime=Wed Mar 22 12:06:00 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=181892, encodeId=bf4a1818920f, content=文章很好,值得分享, beContent=null, objectType=article, channel=null, level=null, likeNumber=157, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/jW482SpianMayicTRbRZ5RzdAIB7UwTkHt6fQkBP8ictliaXtc5gCUmYdAW1sAETC2nhO3q6YjRHkUibyOCtP8ibmXNObTyd63A076/0, createdBy=d4111948983, createdName=1e10c84am36(暂无匿称), createdTime=Wed Mar 22 08:31:04 CST 2017, time=2017-03-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=181629, encodeId=5c1818162931, content=可以对所有晚期uLMS患者进行全基因组测序分析。对于CDK通路上突变的患者,建议给予CDK抑制剂进行治疗, beContent=null, objectType=article, channel=null, level=null, likeNumber=82, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Tue Mar 21 09:15:47 CST 2017, time=2017-03-21, status=1, ipAttribution=)]
    2017-03-21 ylzr123

    可以对所有晚期uLMS患者进行全基因组测序分析。对于CDK通路上突变的患者,建议给予CDK抑制剂进行治疗

    0

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