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Updated: Oct 31, 2025
Modeling Brain Metastasis Via Tail-Vein Injection of Inflammatory Breast Cancer Cells
Published on: February 4, 2021
FATTY ACID SYNTHESIS IS REQUIRED FOR BREAST CANCER BRAIN METASTASIS
Gino B Ferraro1, Ahmed Ali2,3, Alba Luengo2,4
1Edwin L. Steele Laboratories, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
Abstract:
Brain metastases are refractory to therapies that control systemic disease in patients with human epidermal growth factor receptor 2 (HER2+) breast cancer, and the brain microenvironment contributes to this therapy resistance. Nutrient availability can vary across tissues, therefore metabolic adaptations required for brain metastatic breast cancer growth may introduce liabilities that can be exploited for therapy. Here, we assessed how metabolism differs between breast tumors in brain versus extracranial sites and found that fatty acid synthesis is elevated in breast tumors growing in brain. We determine that this phenotype is an adaptation to decreased lipid availability in brain relative to other tissues, resulting in a site-specific dependency on fatty acid synthesis for breast tumors growing at this site. Genetic or pharmacological inhibition of fatty acid synthase (FASN) reduces HER2+ breast tumor growth in the brain, demonstrating that differences in nutrient availability across metastatic sites can result in targetable metabolic dependencies.
Insights
Brain metastases in HER2+ breast cancer are resistant to treatment. Targeting fatty acid synthesis, crucial for brain tumor growth due to nutrient differences, offers a new therapeutic strategy.
Area of Science:
- Oncology
- Metabolic pathways
- Cancer biology
Background:
- Brain metastases in human epidermal growth factor receptor 2 (HER2+) breast cancer are difficult to treat.
- The brain microenvironment promotes therapy resistance.
- Metabolic adaptations in cancer may create vulnerabilities.
Purpose of the Study:
- To investigate metabolic differences between brain and extracranial HER2+ breast tumors.
- To identify potential therapeutic targets based on these metabolic adaptations.
Main Methods:
- Comparative analysis of tumor metabolism at different metastatic sites.
- Genetic and pharmacological inhibition of fatty acid synthase (FASN).
Main Results:
- Fatty acid synthesis is elevated in breast tumors within the brain.
- This elevation is an adaptation to lower lipid availability in the brain.
- Inhibiting fatty acid synthase (FASN) suppressed HER2+ breast tumor growth in the brain.
Conclusions:
- Breast tumors exhibit site-specific metabolic dependencies, such as reliance on fatty acid synthesis in the brain.
- Targeting fatty acid synthesis represents a promising therapeutic strategy for brain metastases in HER2+ breast cancer.
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