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Blood:BAX 335基因疗法有望攻克B型血友病

2020-10-19 星云 MedSci原创

通过将功能性人F9基因(编码凝血因子IX)转入肝细胞中,基因疗法有可能将B型血友病患者的治疗性凝血因子IX(FIX)水平维持在正常水平。

通过将功能性人F9基因(编码凝血因子IX)转入肝细胞中,基因疗法有可能将B型血友病患者的治疗性凝血因子IX(FIX)水平维持在正常水平。

本研究是一项开放标签、剂量递增的1/2期研究,旨在研究BAX 335 (AskBio009, AAV8.sc-TTR-FIXR338Lopt),一种腺相关病毒(AAV)血清型8为基础的FIX Padua基因疗法,用于B型血友病的疗效。

BAX 335的结构示意图

本次报告主要是12个月时对安全性、药代动力学、对FIX活性的效果和免疫反应的中期分析。

8位成年男性患者(20-69岁,FIX活性范围:0.5%-2.0%)接受了首次剂量的BAX 335(IV,共3次):2.0×1011、1.0×1012或3.0×1012载体基因组/kg。

3位受试者发生了4次重度不良反应(SAE),均考虑与BAX 335无关。无SAE导致死亡。未观察到临床栓塞、抑制剂或其他FIX Padua靶向免疫。

不同患者的FIX活性

在7位患者中可检测到FIX表达;FIX活性峰值呈现剂量依赖性(在第3组:32.0%-58.5%)。一位受试者获得了持续的治疗性FIX活性(活性水平约20%),无出血或替代治疗,长达4年;在其他患者中,FIX活性没有持续超过5-11周的。

与既往部分研究相反的是,皮质类固醇激素治疗不能使FIX活性丧失稳定。研究人员推测,转基因的丢失可能是由先天性免疫反应刺激引起的。

原始出处:

Barbara A Konkle, et al. BAX 335 hemophilia B gene therapy clinical trial results - potential impact of CpG sequences on gene expression. Blood. OCTOBER 16, 2020

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    2021-09-03 lvygwyt2781
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    2020-10-19 医鸣惊人

    认真学习了已经

    0

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    2020-10-19 医鸣惊人

    学习

    0

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