CRISPR/ Cas9基因编辑疗法全新临床进展

2020-12-07 医药魔方 医药魔方

12月5日, CRISPR 和 Vertex在ASH会议上联合宣布了CRISPR/Cas9基因编辑疗法(CTX001)最新数据,接受CTX001治疗的10例患者对该疗法表现出持续一致反应。

12月5日, CRISPR 和 Vertex在ASH会议上联合宣布了CRISPR/Cas9基因编辑疗法(CTX001)最新数据,接受CTX001治疗的10例患者对该疗法表现出持续一致反应。7例输血依赖β地中海贫血(TDT)患者,包括3例b0/b0基因型患者接受CTX001治疗后,在最近一次随访时均不依赖输血。3例镰状细胞病(SCD)患者在接受CTX001治疗后,均无血管闭塞危象(VOCs)。CTX001目前处于I/II期临床研究阶段,有望成为一种治愈TDT和严重SCD的潜在疗法。

CTX001是一种在研自体CRISPR/Cas9基因编辑疗法,旨在通过对TDT和SCD患者造血干细胞进行编辑,从而提高红细胞中胎儿血红蛋白(HbF)的水平。HbF是一种携带氧的血红蛋白,它在出生时自然存在,之后转变为成人形式的血红蛋白。基于该项目目前进展,CTX001治疗TDT和SCD适应症已获得 FDA再生医学高级疗法(RMAT)、快速通道、孤儿药和罕见儿科疾病认证。 正在进行的I/II期临床试验CLIMB-111共纳入13例TDT患者。其中7例在接受CTX001治疗后进行了至少3个月的随访,可以进行疗效分析。在随访的3~18个月内,7例患者均不再依赖输血,最后一次随访时的总血红蛋白值达到正常或接近正常水平。总血红蛋白水平为9.7-14.1 g/dL,其中胎儿血红蛋白占比为40.9%-97.7%。7例患者的安全性数据与自体干细胞移植和清髓基本一致。1例患者报告了4件CTX001治疗相关严重不良事件(SAEs),包括头痛、噬血细胞综合征(HLH)、急性呼吸窘迫综合征和特发性肺炎综合征,大多数不良反应是轻中度的。

正在进行的I/II期临床试验CLIMB-121共纳入6例SCD患者。其中3例在接受CTX001治疗后进行了至少3个月的随访。在随访的3~15个月内,3例患者均未出现血管闭塞危象,最后一次随访时的血红蛋白水平达到正常或接近正常范围。总血红蛋白水平为11.5 -13.2 g/dL,其中胎儿血红蛋白占比为31.3%~ 48.0%。3例患者的安全性数据与自体干细胞移植和清髓基本一致。无CTX001治疗相关SAEs,大多数不良反应是轻中度的。

CRISPR-Cas9基因编辑技术就是通过人工设计的 sgRNA(guide RNA)来识别目的基因组序列,并引导 Cas9 蛋白酶进行有效切割 DNA 双链,形成双链断裂,损伤后修复会造成基因敲除或敲入等,最终达到对基因组DNA 进行修饰的目的。德国马克斯·普朗克病原学研究所的EmmanuelleCharpentier博士以及美国加州大学伯克利分校的Jennifer A. Doudna博士因此技术而获批2020年诺贝尔化学奖。 Vertex首席执行官Reshma Kewalramani博士表示,这是CRISPR/Cas9疗法在治疗遗传性疾病人群中首次发表的结果,是医学上的一个重要里程碑,也是我们与CRISPR合作的一个重要里程碑。通过对TDT和SCD患者的临床概念验证和19名患者剂量研究,我们会继续努力,尽快将我们的疗法带给TDT和SCD患者。

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    2020-12-09 yuandd
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    2020-12-09 respect
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    2020-12-09 yaanren
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    2020-12-07 Ziqiang20

    很好

    0

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    2020-12-07 医鸣惊人

    认真学习了

    0

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