PI3Kδ抑制剂umbralisib+CD20抑制剂ublituximab用于CLL试验因疗效显著提前中止

2020-05-07 MedSci MedSci原创

慢性淋巴细胞白血病(chronic lymphocytic leukemia,CLL),慢性淋巴细胞白血病(chronic lymphocytic leukemia,CLL),这是一种老年性疾病,以免

慢性淋巴细胞白血病(chronic lymphocytic leukemia,CLL),慢性淋巴细胞白血病(chronic lymphocytic leukemia,CLL),这是一种老年性疾病,以免疫功能不全的高分化淋巴细胞克隆性增殖为主要特征。CLL细胞多侵犯淋巴结、脾脏,骨髓增生明显活跃,以小淋巴细胞为主,占50%-90%,外周血淋巴细胞数明显增多,并具有较成熟的淋巴细胞表面标志。预计2020年美国将有超过20000例新诊断的CLL病例。虽然CLL的症状在初次治疗后可能会消失一段时间,但这种疾病被认为是无法治愈的,许多人由于恶性细胞的复发将需要额外的治疗。

创新口服PI3Kδ抑制剂umbralisib联合CD20抗体ublituximab(U2),在治疗复发/难治性慢性淋巴细胞白血病(CLL)初治患者的3期临床试验UNITY-CLL的中期分析中,达到了无进展生存期(PFS)的主要研究终点。经独立数据安全监查委员会(DSMB)的审查,建议提前结束该试验。该公司预计在今年年底递交监管申请。

TG Therapeutics公司开发的umbralisib是一款新一代PI3Kδ抑制剂。它对PI3Kδ的特异性优于其它PI3Kδ抑制剂,不会对PI3γ产生抑制。而且它能够通过抑制名为CK1-ε的蛋白,防止扰乱调节性T细胞的功能,从而提高药物的耐受性。它曾获得FDA的突破性疗法认定,治疗边缘区淋巴瘤患者。umbralisib是一种磷酸肌醇-3-激酶δ(PI3Kδ)和酪蛋白激酶1ε(CK-1ε)双效抑制剂,这可能使其克服第一代PI3Kδ抑制剂相关的某些耐受性问题。磷脂酰肌醇-3激酶(PI3K)是一类参与细胞增殖和存活、细胞分化、细胞内运输和免疫等多种细胞功能的酶。PI3K有四种亚型(α、β、δ和γ),其中δ亚型在造血来源的细胞中强烈表达,常与B细胞相关淋巴瘤有关。

umbrasib对PI3K的δ亚型具有纳米摩尔效力,并且对α、β、γ亚型具有高选择性。umbralisib还独特地抑制酪蛋白激酶1-ε(CK1-ε),这可能具有直接的抗癌作用,也可能调节先前PI3K抑制剂中观察到的与免疫介导不良事件相关的T细胞活性。

ublituximab是一种新型糖工程化抗CD20单克隆抗体,靶向成熟B淋巴细胞上CD20抗原的特异性表位。目前,该药正处于III期临床开发,用于多发性硬化症(MS)和慢性淋巴细胞白血病(CLL)的治疗。ublituximab是一种新型糖工程化抗CD20单克隆抗体,靶向成熟B淋巴细胞上CD20抗原的独特表位,该表位与目前已上市的多款CD20单抗不同,包括ofatumumab、ocrelizumab/rituximab、obinutuzumab(GA101)。

该公司公布了全球III期UNITY-CLL试验的阳性顶线结果。该试验在先前未接受治疗(初治)和复发/难治性(经治)慢性淋巴细胞白血病(CLL)患者中开展,评估了umbralisib与ublituximab(U2)联合用药方案的疗效和安全性,并与obinutuzumab+苯丁酸氮芥方案进行了对比。
 
该项试验是根据与FDA达成的特别方案评估(SPA)协议开展的。结果显示,该试验在预先指定的中期分析中已经达到了主要终点:根据独立审查委员会(IRC)的评估,与obinutuzumab+苯丁酸氮芥治疗组相比,U2治疗组无进展生存期(PFS)取得了统计学意义的显著改善(p<0.0001),在既往未接受治疗(初治)和复发/难治性(经治)CLL患者群体中均观察到了治疗益处。
 
由于疗效卓越,根据独立数据安全监测委员会(DSMB)的建议,该试验将提前终止。根据该试验的数据,TG公司计划在2020年底之前提交U2方案治疗先前未接受治疗(初治)和复发/难治性(经治)CLL患者的监管申请。

 

Ublituximab结合CD20分子上的独特表位

UNITY-CLL研究的全球研究主席、英国伦敦巴特斯癌症研究所医学肿瘤学教授John Gribben医学博士表示:“我们非常高兴地看到,这项重要的试验在一线和复发/难治性CLL患者中联合应用umbralisib和ublituximab取得了积极的结果。今天的结果标志着在CLL患者群体中首次成功地进行了基于PI3Kδ疗法治疗方案的III期临床试验,其中包括以前未接受治疗的患者。目前,CLL仍然无法治愈,仍然迫切需要新的治疗方案,特别是那些可提供不同机制和安全性治疗方案。” 

“该试验的积极结果为这款组合疗法成为一种无需化疗的新型CLL患者治疗方案奠定了基础,”TG Therapeutics执行主席兼首席执行官Michael S.Weiss先生说:“我们对这项研究中获得的数据感到非常高兴,组合疗法的卓越疗效使我们可以提前结束这一试验。我们非常感谢参与这项试验的患者、他们的家属以及医生和研究团队。我们期待将这些数据递交给美国FDA,并在2020年年底前的医学会议上展示全部结果。”

当前已批准的PI3Kδ抑制剂与自身免疫介导的毒性有关,如肝毒性、肺毒性和结肠炎。与已批准的PI3K抑制剂相比,umbralisib的特异性差异、其对CK1-ε的独特抑制作用以及其独特和专利的化学结构可能会在PI3K抑制剂类中具有差异化特征。
此前,FDA已授予umbralisib 4个孤儿药资格(ODD),包括FL和全部3种MZL(淋巴结、淋巴结外、脾脏MZL)。此外,FDA还授予了umbralisib治疗既往已接受至少一种抗CD20疗法的复发性或难治性MZL成人患者的突破性药物资格(BTD)。

参考资料:

[1] TG Therapeutics Announces Positive Topline Results from the UNITY-CLL Phase 3 Study Evaluating the Combination of Umbralisib and Ublituximab (U2) for the Treatment of Patients with Chronic Lymphocytic Leukemia. Retrieved 2020-05-05, from http://www.globenewswire.com/news-release/2020/05/05/2027395/0/en/TG-Therapeutics-Announces-Positive-Topline-Results-from-the-UNITY-CLL-Phase-3-Study-Evaluating-the-Combination-of-Umbralisib-and-Ublituximab-U2-for-the-Treatment-of-Patients-with-C.html
[2] A phase 2 multicenter study of ublituximab,  a novel glycoengineered anti-CD20  monoclonal antibody, in patients with  relapsing forms of multiple sclerosis. Retrieved 2020-05-05, from https://www.tgtherapeutics.com/wp-content/uploads/2020/04/MS-Journal-4.29.20.pdf

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    2021-02-26 mhm289
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    2021-02-09 snf701207
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    2020-10-18 aliceclz
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    2021-01-21 jklm09
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    2020-05-07 内科新手

    谢谢梅斯提供这么好的信息,学到很多

    0

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