Blood:基因疗法可显着降低B型血友病患者自发性出血概率。

2017-12-17 MedSci MedSci原创

血友病B基因疗法旨在改变患者的出血风险,并通过单一治疗提高内源性因子IX(FIX)的活性/合成,从而消除对FIX聚集的需求。AMT-060是由一种腺病毒相关病毒-5(AAV5)载体与驱动密码子最优化的野生型人类FIX基因的表达的肝特异性启动子相结合而成。研究人员招募了10位有严重的出血表现的B型血友病成年患者(FIX≤正常值的2%)进行一多国家的开放性研究。所有受试者检测AAV5中和抗体阴性。10

血友病B基因疗法旨在改变患者的出血风险,并通过单一治疗提高内源性因子IX(FIX)的活性/合成,从而消除对FIX聚集的需求。AMT-060是由一种腺病毒相关病毒-5(AAV5)载体与驱动密码子最优化的野生型人类FIX基因的表达的肝特异性启动子相结合而成。

研究人员招募了10位有严重的出血表现的B型血友病成年患者(FIX≤正常值的2%)进行一多国家的开放性研究。所有受试者检测AAV5中和抗体阴性。10位患者均参与试验,予以AMT-060,剂量为5x1012/kg或2x1013/kg(各5位患者)。

在低剂量队列,内源性FIX平均活性增加至4.4IU/dL。FIX年度化的消耗量减少81%,而年度化的自发性出血率(ASBR)从平均9.8降至4.6(53%)。

在高剂量队列,FIX平均活性增加至6.9IU/dL。FIX年度化的消耗量减少73%,而年度化的自发性出血率(ASBR)从平均3.0降至0.7(70%)。

创伤性出血没有减少。FIX活性在两个队列中均保持稳定,9位患者中有8位在研究开始接受FIX时,停止预防措施。低剂量组有1例、高剂量组有2例限制性、无症状、一过性的丙氨酸转氨酶升高,予以泼尼松龙治疗。转氨酶升高时,FIX活性和病毒壳特异性T细胞反应未检测到下降。

单次注射AMT-060安全性良好,而且可稳定的、具有临床意义的增加FIX活性,显着减少自发性出血和FIX浓缩利用。

原始出处:

WolfGang Miesbach,et al.Gene therapy with adeno-associated virus vector 5-human factor IX in adults with hemophilia B.Blood  2017  :blood-2017-09-804419;  doi: https://doi.org/10.1182/blood-2017-09-804419

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    2017-12-19 sodoo
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    2017-12-17 1e0f8808m18(暂无匿称)

    基因治疗是疑难病治愈的希望.

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