Efficacy and safety of atirmociclib (ATI) + fulvestrant (FUL) in patients (pts) with HR+/HER2– advanced/metastatic breast cancer (mBC) who progressed on prior CDK4/6 inhibitor (CDK4/6i) in a randomized phase 2 study (FOURLIGHT-1)
https://esmocongress.esmo.org
ESMO 2026
2026 年 10 月 23–27 日 · Madrid · 共 3194 条
FOURLIGHT-1
★★★23 人 · 24 条 · 2 篇摘要
本事件热度走势
当前热度 9·可比范围峰值 14(10月24日 18:00)·近 24 小时可比范围变化 –·当前参与者 19
在HR+/HER2–乳腺癌的靶向治疗版图中,CDK4/6抑制剂与内分泌治疗已是核心组成,PI3K/AKT/mTOR抑制剂(本研究对照组中的依维莫司+依西美坦即属此类)同样是既定治疗类别,而耐药与毒性始终是限制疗效的主要瓶颈,耐药之后如何选择和排序后续治疗仍是临床未解的难题[6]。
本次ESMO26上公布的FOURLIGHT-1是一项随机II期试验(n=263),入组既往CDK4/6抑制剂治疗后进展的HR+/HER2–晚期/转移性乳腺癌患者,随机接受atirmociclib+氟维司群或研究者选择的治疗(氟维司群,或依维莫司+依西美坦),主要终点为研究者评估的PFS。结果显示中位PFS 9.4 vs 6.6个月,HR 0.60(0.440–825区间为0.440–0.825),单侧p=0.0007;可测量疾病患者的ORR为19.3% vs 11.3%,CBR为61.9% vs 46.0%。安全性方面,最常见TRAE为中性粒细胞减少(46.4%),因TRAE停用atirmociclib的比例仅4.0%。讲者为Antonio Giordano,现场结论将其定位为首个在既往CDK4/6抑制剂治疗后显示出显著且有临床意义PFS改善、安全性可控的下一代CDKi。
值得注意的推进在于:atirmociclib为CDK4选择性抑制剂,设计上通过避开CDK6来减轻困扰现有CDK4/6抑制剂的中性粒细胞减少;此次读数提示,对一种CDK4/6抑制剂耐药未必意味着该通路已被"用尽",下一代CDK抑制策略在既往暴露后仍可重新获得有意义的疾病控制。现场同时点明了将决定这一领域走向的后续问题:哪些患者仍为CDK依赖、哪些耐药机制最关键、能否借助生物标志物区分应继续使用CDK策略还是整体换用其他通路。
局限方面,FOURLIGHT-1为II期规模(n=263),主要终点为研究者评估的PFS,总生存数据、生物标志物分层分析以及后续III期计划均未披露,能否据此改变既往CDK4/6抑制剂治疗后的临床实践仍有待确认。
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FOURLIGHT-1
https://esmocongress.esmo.orgOncoAlert@OncoAlert Aya Mohamed | MSc, MD 🎗@Dr_Oncologista Elisa Agostinetto@ElisaAgostinett Elisabetta Bonzano MD, PhD@to_be_elizabeth Prof. Dr. Ahmet Dirican@dr_dirican Mitsuo Terada, MD, PhD@乳腺科医@MamMa_mimumemo HR+HER2- MBCへのCDK4/6i後、CDK4阻害薬のatirmociclib+FULのPhase 2 FOURLIGHT-1試験。
Carmen Criscitiello@CarmenCriscit Guilherme Nader Marta@GuiNaderMarta Dra. María Natalia Gandur Quiroga@nataliagandur 引用@OncoAlert 4Sight Abstracts to be Presented at #ESMO26 Efficacy and Safety of Atirmociclib + Fulvestrant in Patients With HR+/HER2– Advanced/Metastatic Breast Cancer Who Progressed on Prior CDK4/6 Inhibitor in a Randomized Phase 2 Study (FOURLIGHT-1) @antgiorda 🔬 Randomized phase 2 (n=263): atirmociclib + fulvestrant vs investigator’s choice (fulvestrant or everolimus + exemestane) in HR+/HER2– mBC after prior CDK4/6i. Primary: investigator-assessed PFS. ➡️ Median PFS 9.4 vs 6.6 mo; HR 0.60 (0.440–0.825); 1-sided p=0.0007 ➡️ ORR in patients with measurable disease: 19.3% vs 11.3%; CBR: 61.9% vs 46.0% ➡️ Atirmociclib discontinuation due to TRAEs: 4.0%; most common TRAE neutropenia (46.4%) ✅ First next-generation CDKi to show significant and clinically meaningful PFS improvement after prior CDK4/6i, with a manageable safety profile. #BreastCancer 🎙️ Antonio Giordano (4Sight Made from Abstracts publicly available at the ESMO website) @matteolambe @aftimosp @E_de_Azambuja @DrSGraff @ErikaHamilton9 @hoperugo @stolaney1 @BianchiniGP @aftimosp @kevinpunie @ElisaAgostinett @to_be_elizabeth @GaiaGriguolo @JankovicK @raalbany @JavierCortesMD @JaniceTNBCmets @Prof_Nadia_H @LoiSher @jamecancerdoc @Lucarecco @Dr_Oncologista @guiandri76
Mirrors of Medicine@mirrorsmed 引用@OncoAlert 4Sight Abstracts to be Presented at #ESMO26 Efficacy and Safety of Atirmociclib + Fulvestrant in Patients With HR+/HER2– Advanced/Metastatic Breast Cancer Who Progressed on Prior CDK4/6 Inhibitor in a Randomized Phase 2 Study (FOURLIGHT-1) @antgiorda 🔬 Randomized phase 2 (n=263): atirmociclib + fulvestrant vs investigator’s choice (fulvestrant or everolimus + exemestane) in HR+/HER2– mBC after prior CDK4/6i. Primary: investigator-assessed PFS. ➡️ Median PFS 9.4 vs 6.6 mo; HR 0.60 (0.440–0.825); 1-sided p=0.0007 ➡️ ORR in patients with measurable disease: 19.3% vs 11.3%; CBR: 61.9% vs 46.0% ➡️ Atirmociclib discontinuation due to TRAEs: 4.0%; most common TRAE neutropenia (46.4%) ✅ First next-generation CDKi to show significant and clinically meaningful PFS improvement after prior CDK4/6i, with a manageable safety profile. #BreastCancer 🎙️ Antonio Giordano (4Sight Made from Abstracts publicly available at the ESMO website) @matteolambe @aftimosp @E_de_Azambuja @DrSGraff @ErikaHamilton9 @hoperugo @stolaney1 @BianchiniGP @aftimosp @kevinpunie @ElisaAgostinett @to_be_elizabeth @GaiaGriguolo @JankovicK @raalbany @JavierCortesMD @JaniceTNBCmets @Prof_Nadia_H @LoiSher @jamecancerdoc @Lucarecco @Dr_Oncologista @guiandri76
Kazuki Nozawa, MD@kazuki_nozawa Kristina Jankovic, MD@JankovicK Philippe Aftimos, MD @aftimosp Mali Barbi, MD MSc | Breast & Gyn Oncologist@DrBarbiOnc 引用@#FINER fulvestrant +/- ipatasertib (AKTi) 45% of pts were pathway altered PFS lengthened in ITT HR 0.68 and AKT altered cohorts HR 0.55 93% diarrhea, pretty high G2/3 rates #ESMO26 #ESMOAmbassadors
MeDucation@MeDucationai 引用@FOURLIGHT-1 | ESMO 2026 Can CDK4 inhibition work after CDK4/6 progression? 1. Population: 263 patients with HR+/HER2− advanced breast cancer after prior CDK4/6 inhibitor. 2. Arms: Atirmociclib + fulvestrant vs investigator’s choice (fulvestrant or everolimus + exemestane). 3. Median PFS: 9.4 vs 6.6 months (HR 0.60). 4. ORR: 19.3% vs 11.3%. 5. Clinical benefit ≥24 weeks: 61.9% vs 46.0%. 6. Safety: Neutropenia 46.4%; leukopenia 32.8%; treatment-related discontinuation 4%. 7. Take-home: Promising phase II PFS benefit. OS immature; phase III confirmation needed. Ref: Giordano A, et al. FOURLIGHT-1. ESMO 2026; Abstract 1842O. #ESMO26 #BreastCancer #MVOnco
OncologyEducation@OncEd Nurullah İlhan,MD@drnurullahilhan ScienceLink@sciencelinkonco Mirrors of Medicine@mirrorsmed Giampaolo Bianchini@BianchiniGP Pablo Jara Martin@pablojaramartin Yakup Ergün@dr_yakupergun Dana-Farber News@DanaFarberNews Annals of Oncology@Annals_Oncology