PD-L1类药物Pembrolizumab用于胃癌安全有效(KEYNOTE-012研究)

2015-01-16 MedSci MedSci原创

抗PD-1单克隆抗体pembrolizumab在转移性胃癌患者中表现出了有潜力的抗肿瘤活性,及可管理的毒性。斯坦福大学医学院肿瘤学主任Ronald Levy教授在2015 ASCO GI第一天上午的口头报告中,公布了KEYNOTE-012研究的这一重要结果(摘要号 3)。 Ronald Levy教授 研究内容 KEYNOTE-012研究纳入了39位肿瘤有PD-L1表达的患者。在供筛选的1

抗PD-1单克隆抗体pembrolizumab在转移性胃癌患者中表现出了有潜力的抗肿瘤活性,及可管理的毒性。斯坦福大学医学院肿瘤学主任Ronald Levy教授在2015 ASCO GI第一天上午的口头报告中,公布了KEYNOTE-012研究的这一重要结果(摘要号 3)。

Ronald Levy教授

研究内容

KEYNOTE-012研究纳入了39位肿瘤有PD-L1表达的患者。在供筛选的162位经治的胃癌患者中,40%表达了配体。采用原型免疫组化分析手段来评估肿瘤样本中的PD-L1表达和22C3抗体。定义阳性为间质内或有≥1%的肿瘤细胞染色。

患者接受每2周10 mg/kg的pembrolizumab治疗,持续24个月或直到完全缓解,疾病进展,或出现不可接受的毒性。研究的首要终点为由独立中心评估的客观缓解率。

“随访到第8.8个月时,就出现了抗肿瘤活性的有力证据。” 日本Aichi癌症中心医院的Kei Muro博士在2014年的ESMO大会上报告了该研究的初始分析结果。

按RECIST v.1标准评估的Pembrolizumab的客观缓解率是22.2% (95% CI, 10.1-39.2),研究人员评估的客观缓解率为33.3% (95% CI, 19.1-50.2)。有应答的8位患者均为部分应答;另5位患者疾病保持稳定。亚洲和非亚洲人群的应答相似。

有4位患者的应答无法评估或测定。将近53%的患者有某种程度的肿瘤缩小。

Muro 强调,“8位有应答患者中的6位在分析时仍有应答”。从用药到有应答的中位时间为8周,中位应答持续时间为24周(范围,8周-33周以上)。

Muro在报告中说,中位无进展生存时间(PFS)为1.9个月 (95% CI, 1.8-3.5)。在第6个月时,PFS率为24%,总生存(OS)率为69%。中位OS还没有达到。

研究者们终结说pembrolizumab的安全性和耐受性对于这类人群是可以接受的。4位患者(10.3%)发生了药物相关的3-5级不良反应事件。有一位患者由于缺氧死亡。

 “我们发现高水平的PD-L1表达可以改善结果。”Muro补充道,这一点在ORR,PFS及OS中都能观察到。但是他同时也表示,目前的这一趋势很微弱,而且需要更进一步的研究。

Association Between PD-L1 Expression and Pembrolizumab Efficacy

KEYNOTE-059试验的2期试验将探索pembrolizumab单独治疗,或联用顺铂加5-氟尿嘧啶用于晚期胃癌的疗效。该研究将在今年年初启动。

Ronald Levy教授在报告中,表示了对肿瘤免疫治疗的信心。他表示:“我们发现可以利用免疫系统杀死癌症,这也适用于胃肠道肿瘤。”

他特别对KEYNOTE-012研究评论到,“不需要许多肿瘤细胞表达配体来使药物发挥作用”,然而,他承认只有40%的患者有1%的必要这么做,大多数患者都没有应答。

Levy表示,研究人员正在努力通过组合疗法来增大应答率,可能会通过提高靶点——PD-1配体的表达来达到这一目的。

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    2015-03-24 chendoc242
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    2015-02-11 feather89
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    2015-07-10 snf701207
  5. [GetPortalCommentsPageByObjectIdResponse(id=1703415, encodeId=f0ca1e0341525, content=<a href='/topic/show?id=2fdf10464e6' target=_blank style='color:#2F92EE;'>#KEYNOTE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10464, encryptionId=2fdf10464e6, topicName=KEYNOTE)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=94e330506057, createdName=tm10051991, createdTime=Thu Jan 29 10:20:00 CST 2015, time=2015-01-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1786949, encodeId=4e181e86949f8, content=<a href='/topic/show?id=38601402654' target=_blank style='color:#2F92EE;'>#Pembro#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14026, encryptionId=38601402654, topicName=Pembro)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8994206, createdName=chendoc242, createdTime=Tue Mar 24 12:20:00 CST 2015, time=2015-03-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1725732, encodeId=43441e25732f7, content=<a href='/topic/show?id=986913980dd' target=_blank style='color:#2F92EE;'>#PE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13980, encryptionId=986913980dd, topicName=PE)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f06c33759375, createdName=feather89, createdTime=Wed Feb 11 00:20:00 CST 2015, time=2015-02-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1911680, encodeId=53ba191168029, content=<a href='/topic/show?id=4de7112046c' target=_blank style='color:#2F92EE;'>#mAb#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11204, encryptionId=4de7112046c, topicName=mAb)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=25e7304, createdName=snf701207, createdTime=Fri Jul 10 09:20:00 CST 2015, time=2015-07-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1254879, encodeId=aa2312548e986, content=<a href='/topic/show?id=be71139214f' target=_blank style='color:#2F92EE;'>#PD-L1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13921, encryptionId=be71139214f, topicName=PD-L1)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e76f39, createdName=smartjoy, createdTime=Sun Jan 18 14:20:00 CST 2015, time=2015-01-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1272492, encodeId=2e4412e249265, content=<a href='/topic/show?id=4323140286a' target=_blank style='color:#2F92EE;'>#Pembrolizumab#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14028, encryptionId=4323140286a, topicName=Pembrolizumab)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ac59108, createdName=hxj0117, createdTime=Sun Jan 18 14:20:00 CST 2015, time=2015-01-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=14465, encodeId=f2b4144659e, content=大有前途, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=211.103.217.**, createdTime=Sat Jan 17 00:48:00 CST 2015, time=2015-01-17, status=1, ipAttribution=)]
    2015-01-18 smartjoy
  6. [GetPortalCommentsPageByObjectIdResponse(id=1703415, encodeId=f0ca1e0341525, content=<a href='/topic/show?id=2fdf10464e6' target=_blank style='color:#2F92EE;'>#KEYNOTE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=40, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=10464, encryptionId=2fdf10464e6, topicName=KEYNOTE)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=94e330506057, createdName=tm10051991, createdTime=Thu Jan 29 10:20:00 CST 2015, time=2015-01-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1786949, encodeId=4e181e86949f8, content=<a href='/topic/show?id=38601402654' target=_blank style='color:#2F92EE;'>#Pembro#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14026, encryptionId=38601402654, topicName=Pembro)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8994206, createdName=chendoc242, createdTime=Tue Mar 24 12:20:00 CST 2015, time=2015-03-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1725732, encodeId=43441e25732f7, content=<a href='/topic/show?id=986913980dd' target=_blank style='color:#2F92EE;'>#PE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13980, encryptionId=986913980dd, topicName=PE)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f06c33759375, createdName=feather89, createdTime=Wed Feb 11 00:20:00 CST 2015, time=2015-02-11, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1911680, encodeId=53ba191168029, content=<a href='/topic/show?id=4de7112046c' target=_blank style='color:#2F92EE;'>#mAb#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11204, encryptionId=4de7112046c, topicName=mAb)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=25e7304, createdName=snf701207, createdTime=Fri Jul 10 09:20:00 CST 2015, time=2015-07-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1254879, encodeId=aa2312548e986, content=<a href='/topic/show?id=be71139214f' target=_blank style='color:#2F92EE;'>#PD-L1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=47, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13921, encryptionId=be71139214f, topicName=PD-L1)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e76f39, createdName=smartjoy, createdTime=Sun Jan 18 14:20:00 CST 2015, time=2015-01-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1272492, encodeId=2e4412e249265, content=<a href='/topic/show?id=4323140286a' target=_blank style='color:#2F92EE;'>#Pembrolizumab#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14028, encryptionId=4323140286a, topicName=Pembrolizumab)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=ac59108, createdName=hxj0117, createdTime=Sun Jan 18 14:20:00 CST 2015, time=2015-01-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=14465, encodeId=f2b4144659e, content=大有前途, beContent=null, objectType=article, channel=null, level=null, likeNumber=94, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=211.103.217.**, createdTime=Sat Jan 17 00:48:00 CST 2015, time=2015-01-17, status=1, ipAttribution=)]
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    2015-01-17 211.103.217.**

    大有前途

    0

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