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Updated: Jan 28, 2026
09:29
Studying Triple Negative Breast Cancer Using Orthotopic Breast Cancer Model
Published on: March 20, 2020
18.8K
Postmastectomy radiation therapy for triple negative, node-negative breast cancer
Waqar Haque1, Vivek Verma2, Andrew Farach2
1Department of Radiation Oncology, Houston Methodist Hospital, USA.
Summary
Post-mastectomy radiation therapy (PMRT) use is low for node-negative triple-negative breast cancer (TNBC). PMRT improved survival only for T3 stage patients, not others, suggesting tailored treatment approaches.
Area of Science:
- Oncology
- Radiation Oncology
- Breast Cancer Research
Background:
- Triple-negative breast cancer (TNBC) presents unique treatment challenges.
- The role of post-mastectomy radiation therapy (PMRT) in node-negative TNBC remains controversial.
- Understanding national practice patterns for PMRT in TNBC is crucial for optimizing patient care.
Purpose of the Study:
- To describe national practice patterns of PMRT in node-negative TNBC.
- To evaluate the impact of PMRT on overall survival (OS) in node-negative TNBC patients.
- To identify factors influencing PMRT use and survival outcomes.
Main Methods:
- Analysis of a large, contemporary US database (2004-2014).
- Inclusion of women with non-metastatic TNBC (pT1-4N0M0) undergoing mastectomy.
- Utilized multivariable logistic regression, Kaplan-Meier analysis, and Cox proportional hazards modeling.
Main Results:
- 10.8% of 14,464 eligible patients received PMRT.
- PMRT use varied significantly by T stage (5.7% for T1 vs. 51.6% for T3).
- PMRT was associated with improved OS in T3 disease but not other T stages; older age, higher T stage, and positive margins correlated with worse OS.
Conclusions:
- PMRT use is low in node-negative TNBC, particularly for T1 and T2 stages.
- An overall survival benefit from PMRT was observed only in T3 stage patients.
- Further prospective studies are recommended to clarify PMRT benefits in node-negative TNBC.
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