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Systemic Therapy Approaches for Breast Cancer Brain and Leptomeningeal Metastases
Ajay Dhakal1, Amanda E D Van Swearingen2, Ruth O'Regan1
1University of Rochester, Rochester, NY, USA.
Opinion Statement:
Brain metastasis arising from breast cancer is associated with a poor prognosis. Various systemic chemotherapy and targeted therapies which are effective against breast cancer often fail to provide benefits against brain metastasis. This is mainly due to limited penetration of the therapies across the blood-brain barrier, and divergent evolution of brain metastasis compared to the primary tumor. Thus, brain metastasis is typically treated upfront with local therapies, such as surgery and radiation, followed by systemic therapies. Systemic therapies with CNS permeability are favored in patients with brain metastasis. This paper reviews various systemic therapy options for breast cancer brain metastasis.
Insights
Treating breast cancer brain metastasis is challenging due to the blood-brain barrier. This review explores systemic therapies that can cross into the central nervous system (CNS) for better outcomes.
Area of Science:
- Oncology
- Neuro-oncology
- Pharmacology
Background:
- Breast cancer brain metastasis signifies a poor prognosis, often resistant to standard systemic treatments.
- Limited drug penetration across the blood-brain barrier and tumor evolution hinder treatment efficacy.
- Current treatment paradigms involve local therapies followed by systemic approaches.
Purpose of the Study:
- To review and discuss systemic therapy options for breast cancer brain metastasis.
- To highlight therapies with demonstrated or potential central nervous system (CNS) permeability.
- To inform clinical decision-making for managing this complex condition.
Main Methods:
- Literature review of systemic therapies for breast cancer brain metastasis.
- Focus on agents with known or predicted blood-brain barrier penetration.
- Analysis of treatment efficacy and challenges in the context of CNS involvement.
Main Results:
- Standard systemic therapies often show limited efficacy against brain metastases.
- Emerging therapies and repurposed drugs show promise for CNS penetration.
- Tailoring systemic therapy based on CNS permeability is crucial.
Conclusions:
- Effective management of breast cancer brain metastasis requires systemic therapies capable of crossing the blood-brain barrier.
- Further research into CNS-penetrant therapies is essential.
- A multidisciplinary approach combining local and systemic treatments offers the best strategy.
