ジャーナル: Clin Cancer Res / 年: 2024 タイトル: Oral Estrogen Receptor PROTAC Vepdegestrant (ARV-471) Is Highly Efficacious as Monotherapy and in Combination with CDK4/6 or PI3K/mTOR Pathway Inhibitors in Preclinical ER+ Breast Cancer Models. 著者: Sheryl M Gough / John J Flanagan / Jessica Teh / Monica Andreoli / Emma Rousseau / Melissa Pannone / Mark Bookbinder / Ryan Willard / Kim Davenport / Elizabeth Bortolon / Gregory Cadelina / ...著者: Sheryl M Gough / John J Flanagan / Jessica Teh / Monica Andreoli / Emma Rousseau / Melissa Pannone / Mark Bookbinder / Ryan Willard / Kim Davenport / Elizabeth Bortolon / Gregory Cadelina / Debbie Gordon / Jennifer Pizzano / Jennifer Macaluso / Leofal Soto / John Corradi / Katherine Digianantonio / Ieva Drulyte / Alicia Morgan / Connor Quinn / Miklós Békés / Caterina Ferraro / Xin Chen / Gan Wang / Hanqing Dong / Jing Wang / David R Langley / John Houston / Richard Gedrich / Ian C Taylor / 要旨: PURPOSE: Estrogen receptor (ER) alpha signaling is a known driver of ER-positive (ER+)/human epidermal growth factor receptor 2 negative (HER2-) breast cancer. Combining endocrine therapy (ET) such ...PURPOSE: Estrogen receptor (ER) alpha signaling is a known driver of ER-positive (ER+)/human epidermal growth factor receptor 2 negative (HER2-) breast cancer. Combining endocrine therapy (ET) such as fulvestrant with CDK4/6, mTOR, or PI3K inhibitors has become a central strategy in the treatment of ER+ advanced breast cancer. However, suboptimal ER inhibition and resistance resulting from the ESR1 mutation dictates that new therapies are needed. EXPERIMENTAL DESIGN: A medicinal chemistry campaign identified vepdegestrant (ARV-471), a selective, orally bioavailable, and potent small molecule PROteolysis-TArgeting Chimera (PROTAC) degrader of ...EXPERIMENTAL DESIGN: A medicinal chemistry campaign identified vepdegestrant (ARV-471), a selective, orally bioavailable, and potent small molecule PROteolysis-TArgeting Chimera (PROTAC) degrader of ER. We used biochemical and intracellular target engagement assays to demonstrate the mechanism of action of vepdegestrant, and ESR1 wild-type (WT) and mutant ER+ preclinical breast cancer models to demonstrate ER degradation-mediated tumor growth inhibition (TGI). RESULTS: Vepdegestrant induced ≥90% degradation of wild-type and mutant ER, inhibited ER-dependent breast cancer cell line proliferation in vitro, and achieved substantial TGI (87%-123%) in MCF7 ...RESULTS: Vepdegestrant induced ≥90% degradation of wild-type and mutant ER, inhibited ER-dependent breast cancer cell line proliferation in vitro, and achieved substantial TGI (87%-123%) in MCF7 orthotopic xenograft models, better than those of the ET agent fulvestrant (31%-80% TGI). In the hormone independent (HI) mutant ER Y537S patient-derived xenograft (PDX) breast cancer model ST941/HI, vepdegestrant achieved tumor regression and was similarly efficacious in the ST941/HI/PBR palbociclib-resistant model (102% TGI). Vepdegestrant-induced robust tumor regressions in combination with each of the CDK4/6 inhibitors palbociclib, abemaciclib, and ribociclib; the mTOR inhibitor everolimus; and the PI3K inhibitors alpelisib and inavolisib. CONCLUSIONS: Vepdegestrant achieved greater ER degradation in vivo compared with fulvestrant, which correlated with improved TGI, suggesting vepdegestrant could be a more effective backbone ET for ...CONCLUSIONS: Vepdegestrant achieved greater ER degradation in vivo compared with fulvestrant, which correlated with improved TGI, suggesting vepdegestrant could be a more effective backbone ET for patients with ER+/HER2- breast cancer.
エネルギーフィルター - 名称: TFS Selectris X / エネルギーフィルター - スリット幅: 10 eV
詳細
The microscope was equipped with an E-CFEG. Fringe-free imaging and aberration-free image shifts were used during data collection. Nominal pixel size for 130,000x - 0.96 A/px, calibrated - 0.933 A/px.
撮影
フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) 撮影したグリッド数: 1 / 実像数: 5321 / 平均露光時間: 6.32 sec. / 平均電子線量: 50.5 e/Å2 詳細: Falcon 4i Detector operated in Electron-Event Representation mode was used to record the images.
解像度のタイプ: BY AUTHOR / 解像度: 3.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 使用した粒子像数: 116673
初期 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 3.3.2)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 3.3.2)
最終 3次元分類
クラス数: 3 / ソフトウェア - 名称: cryoSPARC (ver. 3.3.2) 詳細: 3D Variability Analysis (with a local mask surrounding the CRBN-ER region and the resolution filtered to 10 A) was used to select the best subset of particles.