The Transcriptomic Profile Underlying Somatic Monoallelic BRCA1 Inactivation: A Biomarker for Breast Cancer Prognosis
Elza Kuznecova1, Miki Nakazawa-Miklasevica1,2, Nora Krike1
1Institute of Oncology and Molecular Genetics, Riga Stradins University, Pilsonu Street 13, Block 13, LV-1002 Riga, Latvia.
Diagnostics (Basel, Switzerland)
|August 28, 2025
Summary
Monoallelic somatic BRCA1 inactivation in breast cancer may indicate a favorable prognosis. This study identified specific gene expression patterns linked to better outcomes in patients with this genetic alteration.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Research often overlooks somatic BRCA1 alterations in breast cancer.
- Focus has been on germline mutations and tumor loss of heterozygosity.
- Understanding somatic BRCA1 inactivation is crucial for prognostic insights.
Purpose of the Study:
- Identify transcriptomic patterns of monoallelic somatic BRCA1 inactivation.
- Correlate these patterns with event-free survival in breast cancer patients.
- Investigate the prognostic significance of somatic BRCA1 inactivation.
Main Methods:
- Global transcriptome sequencing of 36 breast cancer samples.
- Differential gene expression analysis to identify altered genes.
- Kaplan-Meier survival analysis to assess prognostic impact.
Main Results:
- Monoallelic somatic BRCA1 inactivation showed a trend towards longer event-free survival.
- Suggests a favorable prognostic role for somatic BRCA1 inactivation.
- Identified enrichment of extracellular proteins in affected tumors.
Conclusions:
- Transcriptomic profiles of TPSD1, FABP4, CARTPT, and MMP9 indicate homologous recombination-impaired tumors.
- These profiles are associated with a tendency for better therapeutic results.
- Somatic BRCA1 inactivation may serve as a biomarker for improved breast cancer outcomes.
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