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Notch-1 and Notch-4 biomarker expression in triple-negative breast cancer
Jodi Speiser1, Kimberly Foreman, Eva Drinka
1Department of Pathology, Loyola University Medical Center, Maywood, IL 60153, USA. jspeiser@lumc.edu
Abstract:
Triple-negative breast cancer (TNBC) demonstrates lack of expression of hormone receptors and human epidermal growth factor receptor. However, there is no targeted therapy for TNBC. The authors analyzed 29 TNBC cases for Notch-1 and Notch-4 biomarker expression and subcellular location, Ki67 proliferation rate, and relevant clinical/survival data. Results demonstrated an unfavorable Ki67 rate in 90% of cases, Notch-1 expression in tumor and endothelial cells in 100% of cases, and Notch-4 expression in tumor cells in 73% of cases and endothelial cells in 100% of cases. Additionally, subcellular localization of Notch-1 and Notch-4 was predominantly nuclear and cytoplasmic. In conclusion, (a) the majority of TNBCs are high-grade infiltrating ductal carcinomas with high Ki67 proliferation rate and (b) both Notch-1 and Notch-4 receptors are overexpressed in tumor and vascular endothelial cells with subcellular localization different from that of hormone-positive breast cancer. Targeting Notch signaling with gamma secretase inhibitors should to be explored to further improve the survival rate of TNBC patients.
Insights
Triple-negative breast cancer (TNBC) shows high proliferation and overexpression of Notch-1 and Notch-4 receptors in tumor and endothelial cells. Targeting Notch signaling may improve survival rates for TNBC patients.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Triple-negative breast cancer (TNBC) lacks targeted therapies due to the absence of hormone receptors and HER2 expression.
- TNBC is associated with aggressive disease and poorer prognoses compared to other breast cancer subtypes.
Purpose of the Study:
- To investigate the expression and subcellular localization of Notch-1 and Notch-4 biomarkers in TNBC.
- To correlate biomarker expression with proliferation rates (Ki67) and clinical/survival data in TNBC patients.
Main Methods:
- Analysis of 29 TNBC cases.
- Assessment of Notch-1 and Notch-4 expression and subcellular localization.
- Evaluation of Ki67 proliferation index.
- Correlation with clinical and survival data.
Main Results:
- High Ki67 proliferation rate observed in 90% of TNBC cases.
- Notch-1 was expressed in 100% of tumor and endothelial cells.
- Notch-4 was expressed in 73% of tumor cells and 100% of endothelial cells.
- Predominantly nuclear and cytoplasmic localization for both Notch-1 and Notch-4.
Conclusions:
- TNBCs are predominantly high-grade tumors with high proliferation rates.
- Overexpression of Notch-1 and Notch-4 in tumor and vascular endothelial cells suggests their role in TNBC.
- Targeting Notch signaling pathways, potentially with gamma secretase inhibitors, warrants further investigation for improved TNBC patient survival.
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