RNAi药物治疗乙肝的新药RG6346,疗效强且持久超过1年

2020-11-18 网络 网络

Dicerna Pharmaceuticals与罗氏(Roche)合作开发,治疗慢性乙肝病毒(HBV)感染的RNAi疗法RG6346,在1期临床试验中的最新结果进行公布。试验结果显示,每月一次,总计4

Dicerna Pharmaceuticals与罗氏(Roche)合作开发,治疗慢性乙肝病毒(HBV)感染的RNAi疗法RG6346,在1期临床试验中的最新结果进行公布。试验结果显示,每月一次,总计4次的RG6346治疗导致HBV疾病活动生物标志物的大幅和持久降低。最后一次给药后乙肝表面抗原(HBsAg)水平持续降低时间可长达1年。这项研究为RNAi的临床应用再开大门。此前,RNAi类药物在乙肝,降血脂等领域均取得非凡的结果。

乙肝病毒(HBV)感染是世界上最常见的严重肝脏感染。根据世界卫生组织(WHO)的估计,全世界有超过2.92亿慢性乙肝患者。它每年导致超过80万患者的死亡。HBV同时是导致肝癌的首要原因,而肝癌是世界上导致癌症死亡的第二大因素。目前已有的乙肝治疗方法虽然能够压制HBV的复制,但是很少能够达到长久“功能性治愈”(functional cure)的效果。

乙肝难于治愈的原因是HBV能够在被感染细胞的细胞核中生成共价闭合环状DNA(cccDNA)和整合序列。这些序列的半衰期非常长,而且目前的标准疗法不能有效清除cccDNA。Dicerna公司开发的RG6346能够生成一款靶向HBV基因组特定区域的RNAi,它能够特异性敲低HBV mRNA的生成和HBV进入细胞所需的基因在临床前研究中,这款RNAi能够将动物模型中的HBsAg水平降低3.9 log10

在这项1期临床试验中,18名服用核苷(酸)(NUC)抗病毒疗法的慢性乙肝患者在背景疗法基础上,他们被分为三组,分别每月一次,接受不同剂量的RG6346注射,疗程总计4个月,分别接受不同剂量的RG6346或安慰剂的治疗。患者每月接受一次RG6346治疗,疗程为期4个月。如果他们在疗程结束时HBsAg抗原水平与基线相比降低1.0 log10 IU/mL(1.0 log 10等于10倍)以上,则有资格接受长期随访。

接受RG6346联合NUC抗病毒治疗的受试者中,11/12(92%)在第112天(最后一次RNAi给药后1个月)HBsAg较基线平均降低大于1.0 log10 IU/mL。接受剂量为3 mg/kg的RG6346治疗的患者(n=4)平均HBsAg水平比基线降低了1.80 log10,接受剂量为6 mg/kg的RG6346治疗的患者(n=2)平均HBsAg水平比基线降低了1.84 log10。

12例受试者中的7例(58%)患者的HBsAg绝对水平也达到低于100 IU/mL。该水平与进展为肝硬化和肝细胞癌的风险降低相关。在有资格继续接受长期随访的受试者中,随访时间最长的患者队列(用药剂量1.5 mg/kg;n=3)在第448天(最后一次RNAi给药后1年)的HBsAg水平相对基线平均降低1.40 log10 IU/mL;其中1例受试者在第448天HBsAg水平相对基线降低大于2.0 log10 IU/mL。

RG6346显著持久降低HBsAg水平:左图,与基线相比HBsAg降低倍数;右图,HBsAg绝对水平

同时,在研究中未观察到剂量限制性毒性。药物的安全性和耐受性均良好。

此前,葛兰素史克(GSK)公司拥有的针对所有 HBV RNA 的2-MOE修饰反义寡核苷酸药物,部分 Phase 2a 期研究结果中显示能降低部分慢乙肝初治患者的HBsAg水平。结果显示,300 mg/次 GSK836 治疗组(12例)和安慰剂组(6例)相比,乙肝表面抗原(HBsAg)水平自基线变化分别为 -1.556±1.379(P=0.001)和0.000±0.112 log IU/mL,HBV DNA水平自基线的变化分别为 -1.655±1.479(P<0.001)和 -0.001±0.471 log IU/mL。

关于RG6346

RG6346是与Roche合作开发的用于研究慢性HBV感染的GalXC™RNAi研究候选药物。 Dicerna目前正在对患有非肝硬化慢性HBV感染的成年患者进行RG6346的概念1期试验。如果连续服用,目前的HBV治疗方法(如核苷类似物)可提供长期的病毒抑制作用,但通过HBV表面抗原(HBsAg)和持续的HBV脱氧核糖核酸清除率来衡量,它们很少导致长期的功能性治愈( DNA)对患者血浆或血液的抑制作用。相比之下,RG6346设计为使用RNAi来选择性敲低参与HBV信使RNA(mRNA)的产生以及病毒进入肝细胞的特定基因。如在HBV感染小鼠模型中观察到的,临床前数据表明循环HBsAg降低了99.9%以上。与目前通常可以长期抑制病毒的疗法不同,我们认为RG6346有潜力为慢性HBV患者提供功能性治疗。

参考资料:

Dicerna Announces Positive Updated Data From Phase 1 Trial of RG6346 for Treatment of Chronic Hepatitis B Virus (HBV) Infection at AASLD’s The Liver Meeting® Digital Experience™ 2020. Retrieved November 16, 2020, from https://www.businesswire.com/news/home/20201116005423/en

HBV RNAi inhibitor RG6346 in Phase 1b-2a trial was safe, well-tolerated, and resulted in substantial and durable reductions in serum HBsAg levels. Retrieved November 16, 2020,https://investors.dicerna.com/static-files/a9e626d0-7c53-45e3-9ed1-f0fa700b06e8

 

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    2022-01-24 屋顶瞄爱赏月

    学习了

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    2021-05-17 yinxm8315
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    2020-11-18 ms6000000830752858

    只纳入了对rg6346敏感的患者,那这部分人在慢性乙肝感染患者中的比例有多少?

    1

    展开1条回复
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  6. [GetPortalCommentsPageByObjectIdResponse(id=1187808, encodeId=8b3f118e80815, content=学习了, beContent=null, objectType=article, channel=null, level=null, likeNumber=62, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20211111/81c0b64745c644319545ec26d7ef0b34/9ddb2864d5df4dd9bf4305e380bffc96.jpg, createdBy=c7835705079, createdName=屋顶瞄爱赏月, createdTime=Mon Jan 24 20:58:12 CST 2022, time=2022-01-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1751686, encodeId=b5841e516865e, content=<a href='/topic/show?id=2c2c1553e56' target=_blank style='color:#2F92EE;'>#RNAi#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15537, encryptionId=2c2c1553e56, topicName=RNAi)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=d9d436366397, createdName=yinxm8315, createdTime=Mon May 17 01:51:58 CST 2021, time=2021-05-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1642616, encodeId=c644164261671, content=<a href='/topic/show?id=0b2115543c9' target=_blank style='color:#2F92EE;'>#RNAi药物#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=61, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15543, encryptionId=0b2115543c9, topicName=RNAi药物)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=a79422981940, createdName=ms9203727104890838, createdTime=Sat Jun 12 23:51:58 CST 2021, time=2021-06-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=900167, encodeId=a05e90016e27, content=只纳入了对rg6346敏感的患者,那这部分人在慢性乙肝感染患者中的比例有多少?, beContent=null, objectType=article, channel=null, level=null, likeNumber=111, replyNumber=1, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20210806/9c9981ac243544cf9602809a88f20fc6/7717923e80b44978a13ed36d5c205eb9.jpg, createdBy=b0f75435006, createdName=ms6000000830752858, createdTime=Wed Nov 18 13:24:30 CST 2020, time=2020-11-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=900815, encodeId=06f990081509, content=<a href='/topic/show?id=370215539f6' target=_blank style='color:#2F92EE;'>#RNAi疗法#</a>治疗<a href='/topic/show?id=cf292341925' target=_blank style='color:#2F92EE;'>#乙肝#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=181, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=15539, encryptionId=370215539f6, topicName=RNAi疗法), TopicDto(id=23419, encryptionId=cf292341925, topicName=乙肝)], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20220519/c2ab253484ee4527a2d4e9589a4821ac/45de9bf494a54becb2ea4369c9d11e85.jpg, createdBy=7a3710, createdName=lovetcm, createdTime=Fri Nov 20 15:44:13 CST 2020, time=2020-11-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1032712, encodeId=a7d91032e1202, content=谢谢梅斯提供这么好的信息,学到很多, beContent=null, objectType=article, channel=null, level=null, likeNumber=54, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0620, createdName=内科新手, createdTime=Tue Nov 17 17:51:58 CST 2020, time=2020-11-17, status=1, ipAttribution=)]
    2020-11-17 内科新手

    谢谢梅斯提供这么好的信息,学到很多

    0

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