Lancet:Nusinersen-治疗小儿肌萎缩的新曙光

2016-12-07 xing.T MedSci原创

Nusinersen多剂量鞘内给药具有可接受的安全性和耐受性,药理学效应符合其预期的作用机制,支持其临床疗效。这些结果表明可以针对用Nusinersen治疗小儿脊髓性肌萎缩,开始设计一个持续的、安慰剂对照的3期临床研究临床研究了。

Nusinersen是2′-O-甲氧基硫代磷酸修饰的反义药物被开发用于治疗脊髓性肌萎缩。Nusinersen是专门设计来改变SMN2 mRNA前体的剪接,从而增加功能性存活的运动神经元(SMN)蛋白的数量,这一蛋白在脊髓性肌萎缩患者中缺乏。
 
这项公开分组剂量递增的2期临床研究评估了在婴儿型脊髓性肌萎缩症患者采用鞘内注射多剂量(6mg和12mg剂量当量)的Nusinersen治疗的安全性和耐受性、药代动力学和临床疗效。有资格参与的条件为不论性别年龄在3周到7个月之间出现脊髓性肌萎缩症症状,并且在3周到6个月之间这些患者有SMN1基因纯合性缺失或突变。


安全性评估包括不良事件、身体和神经系统检查、生命体征、临床实验室检查、脑脊液实验室检查和心电图。临床疗效评估包括无事件生存率以及两个运动功能评价指标从基线开始的变化值:亨墨斯密婴儿神经测试第二部分(HINE-2) 运动指标部分和费城儿童医院婴儿神经肌肉性疾病测试(CHOP-INTEND)运动功能测试,以及复合动作电位。通过组织解剖对研究目标、药物浓度、药理活性进行了分析。采用Wilcoxon符号秩检验比较了HINE-2、CHOP-INTEND和复合动作电位进行的基线和最后一次随访值进行了比较。研究人员采用对数秩检验将患者死亡和永久性通气年龄与病例自然史相比较。本研究在ClinicalTrials.gov进行了注册,编号为NCT01839656。
 
该研究在2013年5月3日至2014年7月9日期间共纳入了20名受试者,并在2016年1月26日进行了中期分析评估。所有参与者都经历了不良事件,在16名参与者中报告了77个严重的不良事件,研究调查者认为所有的不良事件与研究药物不相关或不太可能相关。在12mg剂量组可以观察到,相比于基线水平,运动指标成果增加(P<0.0001),CHOP-INTEND运动功能评分改善(P=0.0013),并且尺神经(P=0.0103)和腓总神经(P<0.0001)复合肌肉动作电位幅度增大。

中位死亡和永久性通气年龄未达标,并且Kaplan Meier存活曲线偏离公布的系列病例自然史(P=0.0014)。从服用Nusinersen的患者尸检组织分析表明,运动神经元吸收的药物遍布脊髓、脑干和大脑其他区域的神经元和其他类型的细胞,在服用治疗浓度,可增加脊髓SMN2基因外显子7包裹体和SMN蛋白浓度。
 
由此可见,Nusinersen多剂量鞘内给药具有可接受的安全性和耐受性,药理学效应符合其预期的作用机制,支持其临床疗效。这些结果表明可以针对用Nusinersen治疗小儿脊髓性肌萎缩,开始设计一个持续的、安慰剂对照的3期临床研究了。
 
原始出处:
 
Richard S Finkel,et al. Treatment of infantile-onset spinal muscular atrophy with nusinersen: a phase 2, open-label, dose-escalation study. Lancet.06 December 2016.

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    2017-10-08 仁者大医
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    2017-08-29 yangpeizhi
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    2017-01-09 chendoc252
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    2017-02-12 howi
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