The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer

Abstract Loss of PTEN expression, via homozygous or hemizygous deletion, is common in PIK3CA mutant ER + BC tumors. We assessed reduction of PTEN protein expression on AKT inhibitor capivasertib efficacy in PIK3CA altered tumors. In PIK3CA altered, PTEN protein high models, PI3Kα and AKT inhibition...

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Main Authors: Valentina Cutano, Ming Li Chia, Eleanor M. Wigmore, Lorna Hopcroft, Stuart C. Williamson, Amanda L. Christie, Brandon Willis, James Kerr, Jenny Ashforth, Rhys Fox, Sophie D’Arcy, Lauren Bradshaw, Catherine Blaker, Cath Eberlein, Lambert Montava-Garriga, Elza C. de Bruin, Susan E. Critchlow, Kevin M. Brindle, Simon T. Barry, Susana Ros
Format: Article
Language:English
Published: Nature Portfolio 2025-04-01
Series:npj Breast Cancer
Online Access:https://doi.org/10.1038/s41523-025-00752-9
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author Valentina Cutano
Ming Li Chia
Eleanor M. Wigmore
Lorna Hopcroft
Stuart C. Williamson
Amanda L. Christie
Brandon Willis
James Kerr
Jenny Ashforth
Rhys Fox
Sophie D’Arcy
Lauren Bradshaw
Catherine Blaker
Cath Eberlein
Lambert Montava-Garriga
Elza C. de Bruin
Susan E. Critchlow
Kevin M. Brindle
Simon T. Barry
Susana Ros
author_facet Valentina Cutano
Ming Li Chia
Eleanor M. Wigmore
Lorna Hopcroft
Stuart C. Williamson
Amanda L. Christie
Brandon Willis
James Kerr
Jenny Ashforth
Rhys Fox
Sophie D’Arcy
Lauren Bradshaw
Catherine Blaker
Cath Eberlein
Lambert Montava-Garriga
Elza C. de Bruin
Susan E. Critchlow
Kevin M. Brindle
Simon T. Barry
Susana Ros
author_sort Valentina Cutano
collection DOAJ
description Abstract Loss of PTEN expression, via homozygous or hemizygous deletion, is common in PIK3CA mutant ER + BC tumors. We assessed reduction of PTEN protein expression on AKT inhibitor capivasertib efficacy in PIK3CA altered tumors. In PIK3CA altered, PTEN protein high models, PI3Kα and AKT inhibition was effective, however ablation and partial PTEN expression reduction attenuated PI3Kαi but not AKTi efficacy, alone or combined with fulvestrant. Efficacy was FOXO3 dependent and associated with FOXM1 downregulation. FOXO3A deletion reduced response to capivasertib, and increased FOXM1 expression. Long term capivasertib exposure of ER+ BC cells upregulated FOXM1 expression. Downregulating FOXM1 expression reversed resistance to capivasertib, while FOXM1 overexpression reduced capivasertib efficacy. Collectively this suggests the AKT-FOXO3-FOXM1 axis plays a pivotal role in response to AKTi in ER+ breast cancer with PIK3CA mutations with and without expression of PTEN, that FOXO3 expression loss can mediate resistance, and that FOXM1 downregulation is a potential biomarker of response.
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publishDate 2025-04-01
publisher Nature Portfolio
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series npj Breast Cancer
spelling doaj-art-14c2ab2c850248ca879a899d042a42f32025-08-20T03:15:12ZengNature Portfolionpj Breast Cancer2374-46772025-04-0111111410.1038/s41523-025-00752-9The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancerValentina Cutano0Ming Li Chia1Eleanor M. Wigmore2Lorna Hopcroft3Stuart C. Williamson4Amanda L. Christie5Brandon Willis6James Kerr7Jenny Ashforth8Rhys Fox9Sophie D’Arcy10Lauren Bradshaw11Catherine Blaker12Cath Eberlein13Lambert Montava-Garriga14Elza C. de Bruin15Susan E. Critchlow16Kevin M. Brindle17Simon T. Barry18Susana Ros19Bioscience, Early Oncology, AstraZenecaCancer Research UK Cambridge InstituteEarly Data Science, Oncology Data Science, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaDiscovery Sciences, AstraZenecaTranslational Medicine, AstraZenecaBioscience, Early Oncology, AstraZenecaCancer Research UK Cambridge InstituteBioscience, Early Oncology, AstraZenecaBioscience, Early Oncology, AstraZenecaAbstract Loss of PTEN expression, via homozygous or hemizygous deletion, is common in PIK3CA mutant ER + BC tumors. We assessed reduction of PTEN protein expression on AKT inhibitor capivasertib efficacy in PIK3CA altered tumors. In PIK3CA altered, PTEN protein high models, PI3Kα and AKT inhibition was effective, however ablation and partial PTEN expression reduction attenuated PI3Kαi but not AKTi efficacy, alone or combined with fulvestrant. Efficacy was FOXO3 dependent and associated with FOXM1 downregulation. FOXO3A deletion reduced response to capivasertib, and increased FOXM1 expression. Long term capivasertib exposure of ER+ BC cells upregulated FOXM1 expression. Downregulating FOXM1 expression reversed resistance to capivasertib, while FOXM1 overexpression reduced capivasertib efficacy. Collectively this suggests the AKT-FOXO3-FOXM1 axis plays a pivotal role in response to AKTi in ER+ breast cancer with PIK3CA mutations with and without expression of PTEN, that FOXO3 expression loss can mediate resistance, and that FOXM1 downregulation is a potential biomarker of response.https://doi.org/10.1038/s41523-025-00752-9
spellingShingle Valentina Cutano
Ming Li Chia
Eleanor M. Wigmore
Lorna Hopcroft
Stuart C. Williamson
Amanda L. Christie
Brandon Willis
James Kerr
Jenny Ashforth
Rhys Fox
Sophie D’Arcy
Lauren Bradshaw
Catherine Blaker
Cath Eberlein
Lambert Montava-Garriga
Elza C. de Bruin
Susan E. Critchlow
Kevin M. Brindle
Simon T. Barry
Susana Ros
The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer
npj Breast Cancer
title The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer
title_full The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer
title_fullStr The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer
title_full_unstemmed The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer
title_short The interplay between FOXO3 and FOXM1 influences sensitivity to AKT inhibition in PIK3CA and PIK3CA/PTEN altered estrogen receptor positive breast cancer
title_sort interplay between foxo3 and foxm1 influences sensitivity to akt inhibition in pik3ca and pik3ca pten altered estrogen receptor positive breast cancer
url https://doi.org/10.1038/s41523-025-00752-9
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