NEJM:SPK-8011基因疗法治疗A型血友病

2021-11-18 MedSci原创 MedSci原创

SPK-8011可实现A型血友病患者持续的因子8表达,出血风险降低90%以上

A型血友病是一种由于凝血因子8基因缺陷而引起的血液病,全世界每五千至一万名男性中就有一人患有A型血友病。A型血友病患者基因治疗的目标是安全地给予长期稳定的因子8表达。Spk-8011是一种使用Spark200衣壳且含有密码子优化的人源因子8基因的新型生物工程腺相关病毒(AAV)载体,其可以有效地转导人肝细胞,并表达密码子优化的B结构域缺失的因子8基因,内源性产生因子8用于治疗A型血友病。近日研究人员公布了Spk-8011治疗A型血友病的临床研究结果。

在新近进行的I-II期临床研究,18名A型血友病患者参与,接受4个剂量的Spk-8011,最低剂量组病毒载量为5×1011/Kg体重,最高剂量组为2×1012/Kg体重,所有患者接受为期52周的糖皮质激素治疗以预防AAV相关免疫不良事件。研究的主要终点为评价Spk-8011的安全性和初步疗效,以及因子8的表达和持久性。

参与者安全期平均观察时间为36.6个月。8名患者报告了33起治疗相关不良事件,其中17起与衣壳相关,包含1个严重不良事件;16起与糖皮质激素相关。2名参与者由于抗AAV衣壳细胞免疫反应不能表达因子8,退出研究,16名剩余患者实现因子8持续表达,其中12人表达时间持续2年以上,因子8的活性未随时间下降,第26-52周时患者平均因子8活性为12.9%;52周后为平均活性为12.0%。患者年间出血率下降91.5%,从基线的每年8.5起下降至0.3起。

Spk-8011治疗后患者出血风险大幅降低

研究认为,SPK-8011可实现A型血友病患者持续的因子8表达,出血风险降低90%以上

原始出处:

Lindsey A. George et al. Multiyear Factor VIII Expression after AAV Gene Transfer for Hemophilia A. N Engl J Med,November 18,2021.

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    2021-11-18 ms2000000430314568

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