Lancet Oncol:Pembrolizumab获批一线联合化疗治疗晚期NSCLC(KEYNOTE-021)

2017-05-20 佚名 肿瘤前沿

2017年5月10日,美国FDA加速批准了Pembrolizumab(Keytruda)联合培美曲塞+卡铂用于既往未经治疗的无突变的晚期NSCLC患者(非鳞癌)的治疗。这项适应症的获批使得Keytruda的说明书再次更新(之前的一次是2017年02月份的更新),而且把免疫单抗对于肺癌的治疗带入了一个新阶段,即联合化疗的全新治疗模式。该适应症的批准是基于一项名为KEYNOTE-021的多中心、开放、

2017年5月10日,美国FDA加速批准了Pembrolizumab(Keytruda)联合培美曲塞+卡铂用于既往未经治疗的无突变的晚期NSCLC患者(非鳞癌)的治疗。

这项适应症的获批使得Keytruda的说明书再次更新(之前的一次是2017年02月份的更新),而且把免疫单抗对于肺癌的治疗带入了一个新阶段,即联合化疗的全新治疗模式。

该适应症的批准是基于一项名为KEYNOTE-021的多中心、开放、多批患者入组的临床研究,本研究设置中的G1患者群总计入组了123例晚期或转移性的非鳞状NSCLC患者,且全部患者既往未接受过任何全身治疗。全部患者的中位年龄为64岁,约48%的患者为65岁或以上的,研究中患者随机分组进入到试验组,即免疫单抗联合化疗组,亦或是对照组,即单用化疗组。试验组中的剂量和用法为Pembrolizumab 200mg固定剂量每三周方案,联合培美曲塞+卡铂(PC:Pem 500mg/m2  Carbo AUC=5)进行总计四个周期的一线联合治疗,随后予以Pembrolizumab进行序贯维持治疗,直至该药累计使用至多24个月封顶(实验组 n=60),而另外一组(对照组 n=63)则选择培美曲塞+卡铂(PC)的三周方案作为对照。研究者可选择培美曲塞作为两组中可选的维持治疗药物。分层因素理所当然也考虑了肿瘤的PD-L1表达(TPS<1% vs TPS≥1%)。

结果显示实验组的免疫联合化疗(下图左)较对照组单用化疗(下图右),显着的提高了ORR,并延长了PFS时间。Pembrolizumab联合两药化疗的ORR高达55%,而对照组单用两药化疗有效率为29%(p = 0.0032)。



再在所有有效的患者人群中观察持续缓解的时间,其中实验组中缓解持续时间超过6个月的患者比例为93%,在对照组中这一比例也达到81%。基于培美曲塞既往的Paramount研究,本研究在两组中都允许培美曲塞进行单药的原药维持治疗,这一设计尊重目前一线使用含培美曲塞方案的原药维持的标准原则,对于患者来说是很有意义的,既使得对照组中更多化疗获益的患者能够持续缓解,也在试验组中观察了加以派姆单抗后,患者得到持续缓解的比例进一步提升,说明免疫单抗在维持治疗应用的潜在价值,复现了PD-1治疗普遍具有“有效则效果持续”的特点(本研究中对比维持阶段的疗效,其前提是两组中一线4个周期后维持阶段使用培美曲塞的比例相似,研究数据中提示在试验组中维持阶段使用培美的患者比例为85%,对照组中为69%,略有差异。另外有一项曾在2016年ASCO上披露的名为KEYNOTE-189的III期研究目前还没有数据,它的维持阶段设计比较培美原药维持和培美加派姆两药原药维持,随后更是允许Pembrolizumab进展后跨线!这个数据前沿君觉得非常值得期待,如果免疫的一线加维持与不用免疫的对照组PFS能够拉开,则非鳞癌的维持治疗可能从化疗原药维持模式升级为化疗+免疫的原药维持模式)。



另外PFS时间上,试验组中位为13.0个月,对照组为8.9个月(p = 0.0205),疾病进展的风险显着下降了47%。有意思的是探索性分析的结果:对肿瘤PD-L1的表达高低做分层分析,在PD-L1低表达(TPS<1%)的时候,实验组与对照组的有效率分别为57%和13%,而在PD-L1高表达时(TPS≥1%)实验组与对照组的有效率分别为54%和38%。是的,您没看错,当联合化疗时,PD-L1表达的高或低对免疫+化疗这一模式似乎影响不大,而PD-L1表达低的时候,单用化疗的有效率明显比PD-L1表达高的时候差了很多... 想想同一个药物在NSCLC一线单用的必要条件就是PD-L1高表达,所以这里前沿君也百思不得其解...

OS目前尚未达到中位...



在安全性数据方面(数据较之前2016柳叶刀原文有更新可能产生一点点出入),PC两药化疗的基础上加用Pembrolizumab让不良反应的发生率有所提高。发生SAE的概率在实验组中为41%,而对照组单用PC为28%。

使用Pembrolizumab联合PC常见的AE(全部级别)及发生率:

乏力(71%)

恶心(68%)

便秘(51%)

常见的3-4级的AE及发生率:

乏力(3.4%)

呼吸困难(3.4%)

恶心(1.7%)

呕吐(1.7%)

腹泻(1.7%)

皮疹(1.7%)

有10%的患者因副反应而停用Pembrolizumab,最常见的原因(仅统计≥2%)为严重的肾损伤(发生率为3.4%),其他可能出现的与pembrolizumab相关的免疫介导的副反应还包括肺炎、肠炎、肝炎、肾炎、内分泌异常等,针对于这些可能出现副反应,根据具体情况应及时暂停或中止Pembrolizumab的使用,并及时予以适当的激素进行处理。

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time=2017-05-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=200750, encodeId=edca200e5012, content=好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Sun May 21 08:32:21 CST 2017, time=2017-05-21, status=1, ipAttribution=)]
    2018-05-01 howi
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    2018-01-02 minlingfeng
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  4. 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time=2017-05-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=200750, encodeId=edca200e5012, content=好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Sun May 21 08:32:21 CST 2017, time=2017-05-21, status=1, ipAttribution=)]
    2017-08-30 snf701207
  5. 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time=2017-05-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=200750, encodeId=edca200e5012, content=好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Sun May 21 08:32:21 CST 2017, time=2017-05-21, status=1, ipAttribution=)]
    2017-09-07 chendoc242
  6. 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content=<a href='/topic/show?id=6cef59801ea' target=_blank style='color:#2F92EE;'>#晚期NSCLC#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=59801, encryptionId=6cef59801ea, topicName=晚期NSCLC)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=3b093156350, createdName=经常头晕, createdTime=Sun May 21 22:08:00 CST 2017, time=2017-05-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1411712, encodeId=efc01411e12a1, content=<a href='/topic/show?id=a53e806837f' target=_blank style='color:#2F92EE;'>#联合化疗#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=80683, encryptionId=a53e806837f, topicName=联合化疗)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=ebf32807001, createdName=oliver170, createdTime=Sun May 21 22:08:00 CST 2017, time=2017-05-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=200750, encodeId=edca200e5012, content=好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Sun May 21 08:32:21 CST 2017, time=2017-05-21, status=1, ipAttribution=)]
    2018-03-18 feather89
  7. 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  8. 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time=2017-05-21, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=200750, encodeId=edca200e5012, content=好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://wx.qlogo.cn/mmopen/NUyjXTCJjo7s7ZCKOmmbBTD6nE7gcd5OZpvyGEzkxBP3S275k5ZJVrsPkotZhBglRHM9rKvcj1OgkssqhcnoPw8zIaMZTF8c/0, createdBy=4c441942088, createdName=ylzr123, createdTime=Sun May 21 08:32:21 CST 2017, time=2017-05-21, status=1, ipAttribution=)]
    2017-05-21 ylzr123

    好文,值得点赞!认真学习了,把经验应用于实践,为患者解除病痛。

    0

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