刘澎教授:Brentuximab vedotin疗效不受限于CD30表达水平,前景广阔

2019-06-28 佚名 肿瘤资讯

2019年6月18日~22日,第15届国际淋巴瘤大会(ICML)在瑞士卢加诺(Lugano)举行。此次大会公布了多项Brentuximab vedotin相关研究,受到大家广泛关注。

2019年6月18日~22日,第15届国际淋巴瘤大会(ICML)在瑞士卢加诺(Lugano)举行。此次大会公布了多项Brentuximab vedotin相关研究,受到大家广泛关注。

颠覆认知:Brentuximab vedotin疗效与肿瘤细胞表面CD30表达无关

Brentuximab vedotin又简称为BV,是靶向CD30的抗体与细胞毒药物的偶联药物,由于其独特的作用机制,在很多血液肿瘤中具有广泛应用。既往多通过评估肿瘤细胞表面CD30表达水平来判断Brentuximab vedotin 是否能发挥治疗作用。但是本届ICML会议以及今年EHA和ASCO会议中公布的最新研究结果表明,Brentuximab vedotin的疗效与肿瘤细胞表面CD30的表达水平并无显着相关性。本届ICML会议发布了ECHELON-2研究的最新结果,令大家印象深刻。

ECHELON-2研究拟评估Brentuximab vedotin在外周T细胞淋巴瘤(PTCL)中的疗效和安全性,入组患者包括ALK+ sALCL(IPI评分≥2分),ALK- sALCL,其他未特指的PTCL(PTCL NOS),血管免疫母性T细胞淋巴瘤(AITL),成人T细胞淋巴瘤/白血病,肠病型T细胞淋巴瘤和肝脾T细胞淋巴瘤等。评估BV+CHP(BV、环磷酰胺、阿霉素和强的松)与CHOP(环磷酰胺、长春新碱、阿霉素和强的松)的疗效差别,同时评估CD30表达水平与BV+CHP疗效是否有关联。结果显示,BV+CHP方案的疗效明显优于经典CHOP方案,客观反应率(ORR)分别为83%和72%,完全缓解率(CR)分别为68%和56%,BV+CHP治疗组具有明显的疗效优势。

更为惊喜的是,BV+CHP的疗效与肿瘤细胞表面的CD30表达水平无显着相关性,即不论CD30表达高低,BV+CHP都显示出同样好的疗效,这与之前EHA和ASCO年会上公布的一些研究结果类似。对于这种结果,我个人认为除了检测方法的原因外,还有三种可能原因:第一,肿瘤细胞在空间上的异质性,即同一肿瘤组织里可能同时存在CD30阳性和CD30阴性组织,检测时未发现阳性表达并不代表肿瘤内部真正缺少CD30阳性细胞;第二,空间的演进,即肿瘤在发展过程中可能出现阶段性的CD30阴性和阶段性的CD30阳性,BV治疗时能够阻断中间某个特定演进阶段,从而阻碍肿瘤进一步发展;第三,可能肿瘤细胞表面不表达CD30,但是对肿瘤发展非常重要的肿瘤微环境中可能有CD30阳性成分的表达,针对肿瘤微环境中的靶标治疗,同样能够发挥治疗肿瘤的作用。

肿瘤细胞表面CD30表达水平与Brentuximab vedotin的疗效并无显着相关性这一发现,极大的拓展了Brentuximab vedotin临床治疗中患者选择的空间。随着研究不断深入,新的数据不断公布,我相信会有更多相关信息呈现。

Brentuximab vedotin多项淋巴瘤临床研究结果发表

既往Brentuximab vedotin主要用于经典型霍奇金淋巴瘤、CD30阳性的T细胞淋巴瘤及部分B细胞淋巴瘤。今年ICML、EHA、ASCO会议公布了越来越多详实的数据,证明Brentuximab vedotin的作用不受细胞表面CD30表达水平影响,使其在多种类型淋巴瘤中能够发挥良好的治疗作用。

本届ICML会议公布的Ⅲ期ALCANZA研究, 对CD30阳性皮肤T细胞淋巴瘤采用BV治疗或是医生选择的其他治疗方案(PC)进行比较,中位随访45.9个月,BV组和PC组独立审查机构评估的ORR4(持续4个月以上的ORR)分别为54.7%和12.5%,CR率分别为17.2%和1.6%;研究者评估的ORR分别为59.4%和7.8%,中位PFS分别为16.7个月和3.5个月,中位下次治疗时间(TTNT)分别为14.2个月和5.6个月。上述数据明确提示,在CD30+皮肤T细胞淋巴瘤中,BV治疗显示出更高的治疗反应率和更持久的疗效持续时间。

纵膈大B细胞淋巴瘤是一种少见的CD30弱表达淋巴瘤亚型,ICML发布的另外一项CHECKMATE 436研究中对复发难治纵膈大B细胞淋巴瘤给予BV联合纳武利尤单抗治疗,独立审查机构评估ORR为73%,CR率37%,展示了极为诱人的治疗前景。

可溶性CD30(sCD30)和胸腺活化调节趋化因子(TARC)是霍奇金淋巴瘤(HL)的预后标志物,基线水平增高时患者采用经典的ABVD方案治疗疗效欠佳。ECHELON-1研究中HL患者在测定基线sCD30和TARC后,接受BV+AVD方案(BV、阿霉素、长春新碱、达卡巴嗪)或是ABVD方案(阿霉素、博来霉素、长春新碱、达卡巴嗪)治疗,结果显示,无论基线sCD30水平如何,BV+AVD组患者的2年mPFS相似,分别为80.7%(sCD30>中位数)和82.7%(sCD30≤中位数)。但ABVD组中,sCD30>中位数的患者有效率降低。TARC水平分析也观察到相似结果,BV+AVD组2年mPFS分别为83.4%(TARC水平>中位数)和80.5%(TARC水平≤中位数)。上述数据表明,BV+AVD可以克服不良预后因素,改善患者预后。

Brentuximab vedotin在不同CD30表达水平淋巴瘤中应用前景广阔

Brentuximab vedotin未来有两个探索方向:一方面我们已知BV在CD30阳性淋巴瘤中的有效性,对于一些特殊类型的、不表达或低表达CD30的血液肿瘤中的疗效仍可进一步探索。另一方面,BV和其他药物联合,如与抗PD-1/PD-L1抑制剂等的联合,对一些复发/难治血液肿瘤会是一种很有前景的治疗方向,值得进一步探索。

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    2020-03-16 xirongguo
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    2019-11-01 snf701207
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    2019-06-28 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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