American Association for Cancer Research
can-23-0694_supplementary_data_suppsf1-sf8stxt.pdf (1.34 MB)

Supplementary Data from The Next-Generation Oral Selective Estrogen Receptor Degrader Camizestrant (AZD9833) Suppresses ER+ Breast Cancer Growth and Overcomes Endocrine and CDK4/6 Inhibitor Resistance

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journal contribution
posted on 2023-12-01, 08:43 authored by Mandy Lawson, Natalie Cureton, Susana Ros, Azadeh Cheraghchi-Bashi, Jelena Urosevic, Sophie D'Arcy, Oona Delpuech, Michelle DuPont, David I. Fisher, Eric T. Gangl, Hilary Lewis, Dawn Trueman, Neha Wali, Stuart C. Williamson, Jennifer Moss, Elodie Montaudon, Heloise Derrien, Elisabetta Marangoni, Ricardo J. Miragaia, Sladjana Gagrica, Pablo Morentin-Gutierrez, Thomas A. Moss, Gareth Maglennon, Daniel Sutton, Radoslaw Polanski, Alan Rosen, Jonathan Cairns, Pei Zhang, Mònica Sánchez-Guixé, Violeta Serra, Susan E. Critchlow, James S. Scott, Justin P.O. Lindemann, Simon T. Barry, Teresa Klinowska, Christopher J. Morrow, Larissa S Carnevalli

Supplementary file containing all supplementary tables, text and figures


AstraZeneca (AstraZeneca PLC)



Oral selective estrogen receptor degraders (SERD) could become the backbone of endocrine therapy (ET) for estrogen receptor–positive (ER+) breast cancer, as they achieve greater inhibition of ER-driven cancers than current ETs and overcome key resistance mechanisms. In this study, we evaluated the preclinical pharmacology and efficacy of the next-generation oral SERD camizestrant (AZD9833) and assessed ER–co-targeting strategies by combining camizestrant with CDK4/6 inhibitors (CDK4/6i) and PI3K/AKT/mTOR-targeted therapy in models of progression on CDK4/6i and/or ET. Camizestrant demonstrated robust and selective ER degradation, modulated ER-regulated gene expression, and induced complete ER antagonism and significant antiproliferation activity in ESR1 wild-type (ESR1wt) and mutant (ESR1m) breast cancer cell lines and patient-derived xenograft (PDX) models. Camizestrant also delivered strong antitumor activity in fulvestrant-resistant ESR1wt and ESR1m PDX models. Evaluation of camizestrant in combination with CDK4/6i (palbociclib or abemaciclib) in CDK4/6-naive and -resistant models, as well as in combination with PI3Kαi (alpelisib), mTORi (everolimus), or AKTi (capivasertib), indicated that camizestrant was active with CDK4/6i or PI3K/AKT/mTORi and that antitumor activity was further increased by the triple combination. The response was observed independently of PI3K pathway mutation status. Overall, camizestrant shows strong and broad antitumor activity in ER+ breast cancer as a monotherapy and when combined with CDK4/6i and PI3K/AKT/mTORi. Camizestrant, a next-generation oral SERD, shows promise in preclinical models of ER+ breast cancer alone and in combination with CDK4/6 and PI3K/AKT/mTOR inhibitors to address endocrine resistance, a current barrier to treatment.

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