Clin Cancer Res:HR+HER2-脑转移乳腺癌患者从Abemaciclib治疗中获益很大

2020-10-31 Xiaozeng MedSci原创

Abemaciclib(Verzenio)是一种口服的细胞周期蛋白依赖性激酶CDK4/6抑制剂,于2018年2月26日获FDA批准联合非甾体芳香酶抑制剂治疗绝经后激素受体(HR)阳性HER2阴性晚期或

Abemaciclib(Verzenio)是一种口服的细胞周期蛋白依赖性激酶CDK4/6抑制剂,于2018年2月26日获FDA批准联合非甾体芳香酶抑制剂治疗绝经后激素受体(HR)阳性HER2阴性晚期或转移性乳腺癌

NCT02308020研究是一项非随机的II期研究,招募了脑转移的乳腺癌(MBC)患者,分成4个亚组,A组:HR+HER2-;B组:HR+HER2+;C组:HR+;D组:脑转移手术切除,予以Abemaciclib 200 mg(2/日)单药治疗或联合内分泌治疗,或150 mg(2/日)联合曲妥单抗治疗。

研究流程

旨在评估继发LM的MBC患者采用Abemaciclib治疗的颅内客观缓解率(iORR),同时评估颅外反应、Abemaciclib药代动力学、大脑转移组织暴露和安全性。

颅内外缓解情况

在A组(n=58),3名患者获得缓解,iORR为5.2%,颅内临床受益率为24%。总体存活率(OS)中位数为12.5个月。38%的患者在颅内病灶体积减小。在B组(n=27)中,无患者获得颅内缓解,iCBR为11%。中位OS为10.1个月。22%的患者的颅内病灶缩小。在C组(n=10)中,有一位患者被证实是完全实质缓解。

手术队列各种取样组织内Abemaciclib活性分析物浓度

在D组(n=9),Abemaciclib活性分析物在脑转移灶中的总浓度为体外IC50的96倍(CDK4)和19 倍 (CDK6)以上。安全性与既往研究一致。

该研究未满足其主要终结点。24%的预处理的HR+HER2-MBC患者采用Abemaciclib治疗可获得iCBR。Abemaciclib在脑转移组织中可到达治疗浓度,且原超过CDK4和CDK6抑制所需浓度。

原始出处:

Sara M. Tolaney, et al. A Phase II Study of Abemaciclib in Patients with Brain Metastases Secondary to Hormone Receptor–Positive Breast Cancer. Clin Cancer Res October 15 2020 26 (20) 5310-5319; DOI:10.1158/1078-0432.CCR-20-1764

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    2020-12-12 luwei00
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    2021-02-16 yb6560
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    2020-11-02 fengyi812
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    2020-10-31 lovetcm

    HR+HER2-晚期#乳腺癌##脑转移#可以优先#Abemaciclib#治疗

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