Blood:选择性BTK抑制剂acalabrutinib治疗慢淋白血病的事宜剂量及疗效

2020-03-24 MedSci原创 MedSci原创

Acalabrutinib在复发性/难治性和高风险的初治慢性淋巴细胞白血病中具有临床疗效。 与QD剂量相比,BID剂量可保持血液和组织中BTK几乎完全被占用,可更好地抑制致癌信号。

抑制B细胞受体通路,特别是抑制Bruton酪氨酸激酶(BTK),是治疗B细胞恶性肿瘤(包括慢性淋巴细胞白血病[CLL])的主要策略。靶标占有率是对BTK共价结合的一种量度,已被用作BTK抑制剂临床研究中的药效学参数。但是,从头合成BTK的动力学(决定占有率)和占有率、通路抑制和临床预后之间的关系仍然不确定。

研究人员开展一项2期的随机试验,评估选择性BTK抑制剂acalabrutinib用药剂量为 100mg 2/日(BID)或200mg 1/日(QD)用于复发性/难治性或高风险的初治CLL的疗效、安全性和药代动力学。

共招募了48位患者。结果显示acalabrutinib的耐受性良好,以BID剂量治疗的患者的总体缓解率(ORR)高达95.8%(95% CI 78.9%-99.9%) ,预计2年无进展存活率(PFS)可达87.2%(95% CI 57.2%-96.7%);以QD剂量治疗的患者的ORR为79.2%(95% CI 57.9%-92.9%),预计2年PFS为87.2% (95% CI 57.2%-96.7%) 。

与健康志愿者相比,CLL患者的BTK重新合成速度更快。与QD剂量相比,BID剂量可保持更高的BTK占有率,实现更有效的通路抑制。相比QD剂量,BID剂量获得的占有率会随着时间推移而小幅增加,从而增强下游生物学效应。BTK占有量对临床长期预后的影响尚待确定。

原始出处:

Clare CHUI LING Sun, et al. Clinical and biological implications of target occupancy in CLL treated with the BTK inhibitor acalabrutinib. Blood. March 20, 2020

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    2020-05-18 jklm09
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    2020-03-26 fengting7
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    2020-03-24 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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靶向CD20和PI3K(一种参与B细胞成熟的关键蛋白)可能是治疗B细胞恶性肿瘤的有效策略。研究人员开展一I/Ib期试验,评估二代化合物umbralisib(PI3K-δ抑制剂)联合ublituximab(抗CD20单克隆抗体[U2])用于慢性淋巴细胞 白血病(CLL)或非霍奇金淋巴瘤(NHL)的安全性。在I期剂量递增试验中,采用3+3的设计,摸索最大耐受剂量(MTD)。予以umbralisib&n

Blood:二代测序检测CLL一线化疗后的微小残留病灶的敏感性更高

在一线FCR后达到血液或骨髓(BM)无法检测到最小残留病灶(U-MRD,即MRD≤10-4,简称MRD4)状态的慢性淋巴细胞白血病(CLL)患者的无进展生存期(PFS)延长。但很多患者即使达到了U-MRD4,尤其是IGHV无突变的患者,随后都会复发,表明残留病灶<10-4阈值,我们需要更敏感的MRD评估方法。通过二代测序(NGS)评估MRD的敏感性可达到10-6(MRD6)。为了更好的评估一