# Breast Cancer

Itraconazole has combination-treatment interest in **metastatic triple-negative breast cancer**, but the evidence remains early. The main signal comes from a small retrospective series, supported by anti-angiogenic and pathway-based preclinical data.

### Overview

The breast-cancer rationale comes mainly from itraconazole's effects on angiogenesis, hypoxia-relevant biology, and aggressive phenotypes such as TNBC.

### Key human data

* A small Japanese retrospective series evaluated itraconazole in **13 heavily pre-treated patients** with recurrent TNBC, most with visceral metastases.
* Itraconazole was used alongside chemotherapy, typically in continuous oral dosing ranges such as **200 to 400 mg daily**, rather than a clearly established pulsed breast-cancer schedule.
* Reported outcomes included **median progression-free survival of about 10.8 months** and **median overall survival of about 20.4 months**.
* These findings were promising, but there was no randomised comparator arm, so the data remain hypothesis-generating.

### Key preclinical data

* Itraconazole has shown anti-proliferative effects in breast-cancer cell lines, including TNBC models.
* In non-TNBC breast-cancer models such as **MCF-7** and **SKBR-3**, itraconazole inhibits the Hedgehog pathway by lowering **SHH** and **GLI1** activity. This increases cancer-cell death and pushes the cells toward autophagy. In mice, this translated into smaller tumour grafts and more cell death in the tumours.
* In TNBC models, the best-described mechanism is suppression of the **AKT/mTOR signalling pathway**. This slows cell growth, reduces colony formation, and makes the cells less able to move and spread.
* The broader breast-cancer and pan-cancer literature still supports Hedgehog as one of itraconazole's relevant cancer pathways, even if the TNBC paper itself focuses more on AKT/mTOR and cell-cycle effects.
* Animal and translational work also supports anti-angiogenic activity, with itraconazole affecting blood-vessel growth and pro-angiogenic factors.
* Itraconazole has hypoxia-relevant and anti-angiogenic effects, but direct HIF inhibition is better established for other agents such as mebendazole than for itraconazole itself.

### Practical interpretation

This remains a **very early evidence area**. The biology is plausible, and the retrospective TNBC signal is worth noting, but itraconazole is still an **experimental off-label approach**, not a standard breast-cancer treatment.

Any clinical use needs careful review of **CYP3A4 interactions**, **QT risk**, hepatic function, and the wider treatment regimen.

### References

* [Impact of itraconazole on the survival of heavily pre-treated patients with triple-negative breast cancer](https://pubmed.ncbi.nlm.nih.gov/24982411/)
* [A pilot trial of itraconazole pharmacokinetics in patients with metastatic breast cancer](https://ascopubs.org/doi/10.1200/jco.2011.29.15_suppl.e13565)
* [Anti-proliferation of breast cancer cells with itraconazole: Hedgehog pathway inhibition induces apoptosis and autophagic cell death](https://pubmed.ncbi.nlm.nih.gov/27810405/)
* [Itraconazole inhibits the proliferation and motility of triple-negative breast cancer cells through suppressing the AKT/mTOR pathway](https://pmc.ncbi.nlm.nih.gov/articles/PMC9062109/)
* [Repurposing itraconazole as an anticancer agent](https://pmc.ncbi.nlm.nih.gov/articles/PMC5529765/)
* [Inhibition of the Hedgehog pathway for the treatment of cancer using itraconazole](https://pmc.ncbi.nlm.nih.gov/articles/PMC6711563/)
* [Hedgehog pathway: a potential target of itraconazole in the treatment of cancer](https://pmc.ncbi.nlm.nih.gov/articles/PMC11804422/)

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