# FOXM1 in Bone Metastasis

FOXM1 is an oncogenic transcription factor and a major regulator of cancer progression.

It influences tumour growth, invasion, and spread to distant sites, including bone.

### General role in metastasis

* **Cell cycle:** drives G1 to S and G2 to M phase transitions
* **Invasion and migration:** upregulates matrix metalloproteinases that help break down extracellular matrix
* **EMT:** helps stationary cancer cells acquire migratory and invasive behaviour
* **Angiogenesis:** increases VEGF expression and supports tumour blood-vessel growth
* **Drug resistance:** higher FOXM1 expression is linked to chemotherapy and endocrine resistance in breast cancer

### FOXM1 in the bone microenvironment

Its role in native bone cells is still not fully resolved.

The current picture is mixed:

* its role in osteoclast differentiation remains unclear, with contradictory findings across studies
* inhibiting FOXM1 may enhance osteoblast formation in some settings
* in breast cancer, higher FOXM1 expression is linked to lymph-node metastasis, more aggressive phenotypes, and poorer prognosis in ER-positive disease
* FOXM1 interacts with TGF-β signalling, which is already strongly linked to breast-cancer spread into bone
* in prostate cancer, FOXM1 is highly expressed in bone metastases and appears to support tumour growth in skeletal sites

### Therapeutic targeting

Several FOXM1-targeting strategies have shown preclinical interest:

* **Honokiol** suppresses FOXM1 expression
* **Thiostrepton** inhibits FOXM1 and has drawn interest in both cancer and inflammatory bone-destruction settings
* **Andrographolide** lowers FOXM1 through the ROS-FOXM1-ERα axis in ER-positive breast-cancer models and also appears to reduce breast-cancer-induced osteoclast activity
* **TGF-β1 plus FOXM1 co-inhibition via nanoparticles** is being studied preclinically for triple-negative breast cancer with bone metastasis

Human data on FOXM1-targeted strategies remains limited.

This is still an active research area rather than an established clinical strategy.

### Key References

A narrative review of research progress on FoxM1 in breast cancer\
<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8667115/>

Sustained activation of SMAD3/SMAD4 by FOXM1 promotes TGF-β-dependent cancer metastasis\
<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3904622/>

TGF-β1 and FOXM1 siRNA co-loaded nanoparticles for triple-negative breast cancer and its bone metastases therapy\
<https://www.tandfonline.com/doi/abs/10.1080/03639045.2024.2404979>

Andrographolide Inhibits ER-Positive Breast Cancer Growth and Enhances Fulvestrant Efficacy via ROS-FOXM1-ER-α Axis\
<https://pmc.ncbi.nlm.nih.gov/articles/PMC9124841/>

FoxM1: a Master Regulator of Tumor Metastasis\
<https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3129416/>

Oncogenic role of FOXM1 in human prostate cancer\
<https://www.spandidos-publications.com/10.3892/or.2023.8674>

FOXM1 as a novel therapeutic target for cancer drug therapy\
<https://pubmed.ncbi.nlm.nih.gov/25640357/>

### Bone Metastases in Breast Cancer pages

* [Bone Metastases in Breast Cancer](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer.md)
* [Xgeva and Zometa](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer/xgeva-and-zometa.md)
* [Integrative and Off-Label Strategies](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer/integrative-and-off-label-strategies.md)
* [FOXM1 in Bone Metastasis](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer/foxm1-in-bone-metastasis.md)
* [Bone Support and Protocol Notes](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer/bone-support-and-protocol-notes.md)
* [Group Member Tips and Supporting Evidence](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer/group-member-tips-and-supporting-evidence.md)

### Also relevant

* [SABR for BC Bone Mets 2025 Study Summary](/myhealingcommunity-docs/breast-cancer/metastatic-disease-support/bone-metastases-in-breast-cancer/sabr-for-bc-bone-mets-2025-study-summary.md)


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