J Clin Oncol:端粒酶抑制剂Imetelstat可有效治疗骨髓纤维化!

2021-06-18 MedSci原创 MedSci原创

不良风险的JAKi-R/R 骨髓纤维化患者可从Imetelstat 9.4 mg/kg(1次/3周)治疗中获得临床有益的症状缓解率

经Janus相关激酶抑制剂 (JAKi) 治疗后复发的或JAKi难治性(R/R)的骨髓纤维化患者临床预后不佳,总体生存率 (OS)仅13-16个月。Imetelstat 是一种端粒酶抑制剂。一项II期多中心研究评估了Imetelstat用于中高危风险的JAKi-R/R骨髓纤维化患者的疗效和安全性。

受试患者被随机分组,接受Imetelstat 9.4 mg/kg或4.7 mg/kg治疗,静滴,3周一次。主要终点是24周时的脾缓解率(脾体积缩小≥35%)和症状缓解率(总症状评分降低≥50%)。次要终点包括OS和安全性。

A:所有随机分组患者的OS;B:OS与骨髓纤维化变化或稳定的相关性

研究招募提前结束,接受4.7 mg/kg Imetelstat治疗的患者被允许继续接受9.4 mg/kg剂量治疗。24周时,9.4 mg/kg组的脾缓解率和症状缓解率分别是10.2%和32.2%,4.7 mg/kg组的分别是0%和6.3%。在采用9.4 mg/kg Imetelstat治疗的患者中,中位OS为29.9个月,40.5%的患者获得了骨髓纤维化改善,而且42.1%的可评估患者的驱动基因的突变等位基因频率降低。

纤维化改善和变异等位基因频率降低与OS相关。端粒酶活性和端粒酶逆转录酶水平的降低证明了靶标抑制,并与脾脏反应、症状反应和OS相关。最常见的不良反应是3/4级的可逆性血细胞减少。

总而言之,在这项关于Imetelstat两个用药剂量的II期试验中,不良风险的JAKi-R/R 骨髓纤维化患者可从Imetelstat 9.4 mg/kg(1次/3周)治疗中获得临床有益的症状缓解率,且安全性良好。生物标志物和骨髓纤维化评估表明,Imetelstat对恶性克隆有选择性影响。一项验证性的III期研究正在进行中。

原始出处:

John Mascarenhas, et al. Randomized, Single-Blind, Multicenter Phase II Study of Two Doses of Imetelstat in Relapsed or Refractory Myelofibrosis. Journal of Clinical Oncology. https://ascopubs.org/doi/full/10.1200/JCO.20.02864

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    2021-06-22 一闲
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    2022-01-06 jklm09
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    2022-05-27 minlingfeng
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    2021-06-19 小小医者

    #骨髓纤维化#,端粒酶抑制剂会不会抗#衰老#??

    0

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    2021-06-18 anti-cancer

    谢谢梅斯分享这么多精彩信息

    0

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生物制药公司Sierra Oncology今天报道了JAK受体抑制剂Momelotinib在合并血小板减少症骨髓纤维化患者中的最新疗效分析。