Abstract
Purpose
As survival of patients with central nervous system (CNS) metastases from breast cancer is poor and incidence rates are increasing, there is a growing need for better treatment strategies. In the current study, the efficacy of local and systemic therapies was analyzed in breast cancer patients with CNS metastases.
Methods
Medical records from breast cancer patients with brain and/or leptomeningeal metastases (LM) treated at a tertiary referral center and a teaching hospital between 2010 and 2020 were retrospectively studied. Main outcomes of interest were overall survival (OS) and CNS progression free survival. Analyses were performed among patients with brain metastases (BM) and patients with LM, for the different systemic and local therapies for CNS metastases, and for subgroups based on breast cancer subtypes.
Results
We identified 155 patients, 97 with BM and 58 with LM. Median OS was 15.9 months for patients with BM and 1.5 months for patients with LM. Median OS was significantly longer for HER2-positive patients with BM (22.8 months) vs triple negative (8.4 months) and hormone receptor positive/HER2-negative (5.9 months) (P < 0.001). Patients with BM receiving both local and systemic therapy also had a longer median OS (21.8 months), compared to the other three subgroups (local therapy only: 9.9 months, systemic therapy only: 4.3 months, no therapy: 0.5 months, P < 0.001). No significant difference in OS was observed between different systemic treatment regimens.
Conclusion
Breast cancer patients with BM show longest median OS when the subtype is HER2-positive and when they are treated with both local and systemic therapy.
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Data availability
The datasets generated and analyzed during the current study are available via the corresponding author on reasonable request.
Abbreviations
- BBB:
-
Blood–brain barrier
- BC:
-
Breast cancer
- BCBM:
-
Breast cancer brain metastases
- BM:
-
Brain metastases
- CI:
-
Confidence interval
- CNS:
-
Central Nervous System
- CSF:
-
Cerebrospinal fluid
- HER2:
-
Human epidermal growth factor receptor 2
- HR:
-
Hormone receptor
- IQR:
-
Interquartile range
- LM:
-
Leptomeningeal metastases
- MRI:
-
Magnetic resonance imaging
- NKI-AvL:
-
Netherlands Cancer Institute—Antoni van Leeuwenhoek
- OS:
-
Overall survival
- PFS:
-
Progression-free survival
- RT:
-
Radiotherapy
- SD:
-
Standard deviation
- SRS:
-
Stereotactic radiosurgery
- TN:
-
Triple negative
- WBRT:
-
Whole brain radiotherapy
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GSS reports institutional research support from AstraZeneca, Merck, Novartis, Roche and Seagen and advisory roles for Biovica and Seagen. The other authors declare that they have no competing interests.
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Wellerdieck, N.E.A., Wessels, P., Los, M. et al. Local and systemic therapy in breast cancer patients with central nervous system metastases. Breast Cancer Res Treat 194, 365–384 (2022). https://doi.org/10.1007/s10549-022-06605-4
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DOI: https://doi.org/10.1007/s10549-022-06605-4