Clin Cancer Res:Palbociclib可阻止早期乳腺癌细胞增殖

2017-03-16 佚名 CSCO

Palbociclib被欧美批准用于联合来曲唑或氟维司群治疗激素受体阳性(HR+)、人表皮生长因子2阴性(HER2-)进展期或晚期乳腺癌。而对于HR+/HER2早期乳腺癌多项研究证实palbociclib具有抗增殖作用,并探索在早期乳腺癌中生物标志物的改变。



Cynthia Ma 和 Matthew Ellis等开展的一项II期新辅助研究NeoPalAna近期发表于Clin Cancer Res(DOI:10.1158/1078-0432.CCR-16-3206)。Palbociclib联合阿那曲唑用于II/III期ER+/HER2-MBC,患者首先接受阿那曲唑治疗(1mg/天*28天)周期0(C0),随后在第一周期第一天起(C1D1)联合palbociclib(125mg,3/1,28天一周期)治疗。绝经前女性在D1联合戈舍瑞林。Palbociclib与阿那曲唑联合治疗4周期。随后在第五周期,患者接受术前2-4周阿那曲唑治疗,20例患者接受了直至术前的palbociclib用药10-12天。研究最初设计仅入组PIK3CA野生型的患者,后修改为可入组PIK3CA突变或野生型的患者。在基线,C1D1,C1D15进行活检。中心评估Ki67水平。在C1D15时Ki67>10%的患者结束研究治疗。主要研究终点为完全细胞周期阻滞(CCCA),定义为C1D15时≤2.7%。研究假设阿那曲唑联合palbociclib较阿那曲唑单药改善CCCA。预估AI单药CCCA为44%,联合组CCCA66%。



共入组50例绝经前/后患者,中位年龄57.5岁(34-79岁)。在45/50例患者中评价主要研究终点。

39/45例患者观察到CCCA,Palbociclib联合阿那曲唑抑制乳腺癌的增殖(C1D15 87% vs C1D1 26%, p<0.001),且不论luminal亚型(A或B)、PIK3CA状态,在不同临床病理特征及突变谱的患者中均显示出活性。

Palbociclib术前洗脱期后Ki67快速恢复,支持palbociclib在早期乳腺癌辅助治疗长期用药假设。palbociclib耐药与非luminal亚型、RB1缺失、持续E2F靶向基因表达相关。

联合治疗最常见的不良事件(所有级别)为中性粒细胞减少症(56%),白细胞减少(46%)和乏力(40%)。G3/4不良事件包括中性粒细胞减少(22%G3和4%G4),ALT升高(4%G3),AST升高,高血压和胆囊炎(2%G3)。7例患者出现减量(2例肝功能检测,4例粒缺,1例皮疹)。



Arnedos等开展一项II期随机开放单中心术前短期palbociclib治疗的研究(PreOperative Palbociclib,POP),评估palbociclib用于早期乳腺癌对增殖和标记物的改变(Study NCT02008734)。研究入组未经治疗的浸润性乳腺癌不论HER2和ER状态,肿瘤大小至少15mm,高增殖(G2或Ki67≥20%)。排除非首选手术治疗而适合新辅助化疗或内分泌的患者。患者按3:1随机接受palbociclib125mg每天*14天治疗直至手术对照无治疗组。主要终点为15天时 Ki67 的对数值(lnKi67)<1 的患者比例。次要终点为 Ki67 的改变值,安全性以及探索性分析治疗与肿瘤特征和增殖情况的改变的相关性。肿瘤样本取自基线时和手术时。



74例患者随机接受palbociclib治疗(中位年龄52岁,55%为绝经后,平均肿瘤大小21mm),26例患者纳入对照组(中位年龄54岁,54%为绝经后,平均肿瘤大小为24mm)。大部分患者为T0-T2,导管型(81%),肿瘤分级(58%),HR+/HER2-(84%)。大部分患者接受(N=69)接受palbociclib 125mg治疗14天。

4例患者发生G3不良事件(2例腹泻,2例粒缺)。1例患者因粒缺推迟手术治疗。无严重不良事件。

Palbociclib组显着改善患者抗增殖缓解率(lnKi67<1 58% 比 12%, p<0.001)。在HR+/HER2-亚组,palbociclib降低Ki67(70%比9%,p=0.002)。在HER2阳性或TNBC患者中未观察到Ki67缓解。HR+/HER2-人群中,在治疗第15天,palbociclib组显着降低Ki67 (p<0.0001)。palbociclib显着降低pRb(p=0.001),但有部分患者未出现pRb水平降低,且与Ki67未降低有相关性。Palbociclib用于早期乳腺癌术前短期治疗可显着降低HR+/HER2-患者Ki67水平。与 Palbociclib 引起的 Ki67 降低相关分子变化仅有 phosphor-Rb 水平的降低。基线时 Rb、p16、pER、pAKT 表达情况,CCND1 的扩增情况,以及 PIK3CA 的突变情况均不能预测 Palbociclib 引起的肿瘤增殖减少。此外,CDK1 和 CD25C 的表达量,对手术时 lnKi67 值有弱预测作用。



点评:Ki67 对于内分泌治疗来说是已经确认的药效学标志物,但是由于重复性很差,所以 Ki67 的临床应用非常有限。进行 Ki67 评分标准化的工作,可能会解决这些局限性。研究的主要观察项目,即palbociclib对 HR+/HER2- 患者的结果是可靠的,并获得了较好的结果,同时为palbociclib用于早期乳腺癌辅助治疗提供依据。研究提示可能存在与应答或耐药相关的生物标志物,这些标志物如果获得进一步的确认的话,有助于今后的临床研究与应用。

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    2017-03-18 yxch36
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    2017-03-17 执着追梦

    学习了,非常棒

    0

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    2017-03-16 天涯183

    非常好的研究

    0

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    2017-03-16 Albert Wu

    Palbociclib可阻止早期乳腺癌细胞增殖

    0

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来自 Wellcome Trust Sanger 研究所的研究人员及其合作者已经发现,更多数量的乳腺癌在遗传上类似于具有错误的 BRCA1 或 BRCA2 基因的罕见病例。今天(3 月 13 日)在 Nature Medicine 上发表的结果揭示了高达 20%的妇女接受 PARP 抑制剂治疗的可能性,PARP 抑制剂是一种以前仅被认为对具有遗传性 BRCA1 或 BRCA2 突变的妇女有效的药物

J Exp Med:浙大董辰方教授发现糖尿病药物对乳腺癌有积极作用

自中国的一组医疗团队风险一种名为 AKR1B1 的代谢酶对乳腺癌的作用。研究表示,AKR1B1 可以通过积极的反馈回路促进基底细胞型乳腺癌的发展。研究报告发表于《实验医学》杂志中,具体指出了通过代谢酶的抑制剂治疗乳腺癌的方法。

指南:绝经后乳腺癌患者血脂异常的处理

雌激素可影响脂蛋白类型和血脂水平,对于心血管系统有一定的保护作用。绝经后乳腺癌患者由于受到药物治疗和卵巢功能的减退的双重影响,从而导致雌激素水平的明显下降。由于雌激素水平的下降导致血脂异常,进而导致心血管疾病的患病风险增加。因此规范处理乳腺癌患者的血脂异常,能够有效降低有效地降低绝经后乳腺癌患者动脉粥样硬化性心血管疾病(ASCVD)的风险,进一步改善乳腺癌患者的长期生存状况。

JEM:糖尿病药物对乳腺癌有积极作用

自中国的一组医疗团队风险一种名为 AKR1B1 的代谢酶对乳腺癌的作用。研究表示,AKR1B1 可以通过积极的反馈回路促进基底细胞型乳腺癌的发展。研究报告发表于《实验医学》杂志中,具体指出了通过代谢酶的抑制剂治疗乳腺癌的方法。大约 15 - 20% 的乳腺癌是基底细胞型乳腺癌,其中包括三阴性乳腺癌,此类癌症易复发,也会转移到肺部和大脑。目前,还没有有效的治疗方法。基底细胞型乳腺癌的侵略性就在于上皮