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ASCO2022:里程碑式突破!DESTINYBreast04结果显示,T-DXd对HER2-低表达mBC安全有效!

2022-06-07 MedSci原创 MedSci原创

在HER2低表达、不可切除和/或转移性乳腺癌患者中比较T-DXd与医生选择化疗的效果——DESTINY-Breast04研究

约有55%的转移性乳腺癌(mBC)通常被归类为HER2阴性,表达低水平的HER2(根据ASCO/CAP 2018指南,IHC 1+或IHC 2+/ISH−),总体而言,这些患者在主要治疗期间进展后的靶向治疗选择有限,最常接受单药姑息性化疗。

具体而言,对于HR+/HER2-转移性疾病患者,内分泌治疗和CDK4/6抑制剂联合治疗的中位有效时间约为2年,之后通常会出现耐药。真实世界数据表明,在转移性疾病背景下,CDK4/6抑制剂和化疗后给予全身治疗的无进展生存期低至4个月。对于HR-/HER2-转移性疾病患者,可用的靶向药物很少,特别是对于无致病性BRCA突变或无PD-L1表达的肿瘤患者。

DESTINYBreast04 (NCT03734029)是第一项对HER2低表达晚期乳腺癌化疗失败患者接受T-DXd或医师选择化疗方案(TPC)的有效性和安全性进行了比较的III期临床研究。

在这一项随机、多中心、开放标签III期研究中,共557例HER2低表达mBC患者,按2:1比例被随机分至2组:T-DXd 组(5.4 mg/kg)或TPC组(卡培他滨、艾力布林、吉西他滨、紫杉醇或白蛋白紫杉醇)。研究的主要终点是 HR+ mBC患者的无进展生存期(PFS)。关键次要终点为包括完整分析集(FAS;HR+/−)中BICR的PFS和HR+ mBC和FAS患者的总生存期(OS)。其他终点包括客观缓解率、缓解持续时间、安全性以及HR- mBC患者的探索性分析。

截至2022年1月11日,中位随访时间为18.4个月(95% CI:17.9-19.1)。

在PFS数据方面,与TPC相比,T-DXd

在HR+队列中,使疾病进展或死亡风险下降49%(中位PFS:10.1个月 vs 5.4个月;HR=0.51,95% CI:0.40-0.64;P<0.001)

在所有患者中,使疾病进展或死亡风险下降50%(中位PFS:9.9个月 vs 5.1个月;HR=0.50,95% CI:0.40-0.63;P<0.001)

在HR-队列中,使疾病进展或死亡风险下降54%(中位PFS:8.5个月 vs 1.9个月;HR=0.46,95% CI:0.24-0.89)

在OS数据上,与TPC相比,T-DXd

在HR+队列中,使死亡风险下降36%(中位OS:23.9个月 vs 17.5个月;HR=0.64,95% CI:0.48-0.86;P=0.003)

在所有患者中,使疾病进展或死亡风险下降26%(中位OS:23.4个月 vs 16.8个月;HR=0.64,95% CI:0.49-0.84;P=0.001)

在HR-队列中,使疾病进展或死亡风险下降52%(中位OS:18.2个月 vs 8.3个月;HR=0.48,95% CI:0.24-0.95)。

在安全性方面,T-DXd和TPC患者分别有52.6%67.4%的患者发生≥3级的治疗相关不良事件。T-DXd患者中有45例(12.1%)出现药物相关性肺间质性疾病(ILD)/肺炎,而TPC组则为1例(0.6% )。

综上,该研究结果表明,对于HER2低表达晚期乳腺癌患者,T-DXd与医师选择化疗方案相比,患者的PFS和OS均有统计学显著和临床意义显著的获益,且总体安全可控。

关于T-DXd

T-DXd是阿斯利康和第一三共联合开发的创新抗体偶联药物。与靶向HER2的抗体疗法相比,T-DXd不需要通过抑制HER2活性产生疗效,肿瘤细胞上表达的HER2只是引导ADC将细胞毒性药物递送到细胞内部的信号,这让它可能在HER2表达水平更低的肿瘤中产生效果。

这款创新ADC使用了第一三共称为DXd ADC的技术平台,在ADC的细胞毒性药物和连接子上作出了多种技术创新。比如与抗体偶联的DNA拓扑异构酶I抑制剂(DXd)具有独特的作用机制,与常见化疗药物伊立替康(irinotecan)相比,活性提高10倍。而且这一细胞毒性载荷具有很强渗透细胞膜的能力,让它们在杀伤吞入ADC的癌细胞之后,能够杀死附近的癌细胞,产生“旁观者效应”(bystander effect)。

 

原文来源:

Novel Antibody-Drug Conjugate Doubles Progression-Free Survival in Metastatic Breast Cancer With Low HER2 Expression Levels. Retrieved June 5, 2022, from https://www.asco.org/about-asco/press-center/news-releases/novel-antibody-drug-conjugate-doubles-progression-free.

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    2023-02-10 xzw113
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    2022-12-19 luwei00
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    2023-04-02 quxin068
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    2022-06-08 zhaojie88
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    2022-06-08 fusion
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    2022-06-08 fusion

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