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Sentinel node micrometastases in breast cancer do not affect prognosis: a population-based study
Adriana J Maaskant-Braat1, Lonneke V van de Poll-Franse, Adri C Voogd
1Department of Surgery, Catharina Hospital, PO Box 1350, 5602 ZA, Eindhoven, The Netherlands. sabrinamaaskant@gmail.com
Breast Cancer Research and Treatment
|August 4, 2010
Summary
Sentinel node biopsy (SNB) in breast cancer detects micrometastases, but these, along with isolated tumor cells, show no significant survival difference compared to node-negative disease. This finding suggests minimal impact on overall survival in the initial years post-diagnosis.
Area of Science:
- Oncology
- Pathology
Background:
- Sentinel node biopsy (SNB) enhances axillary staging in breast cancer, increasing micrometastasis detection.
- Micrometastasis detection has risen, potentially causing stage migration and questions about prognostic relevance.
Purpose of the Study:
- To compare survival outcomes for breast cancer patients with sentinel node micrometastases versus node-negative and node-positive disease post-SNB introduction.
- To assess the prognostic significance of micrometastases and isolated tumor cells detected via SNB.
Main Methods:
- Population-based analysis using data from the Eindhoven Cancer Registry (1996-2006).
- Inclusion of 6803 women with invasive breast cancer undergoing SNB.
- Comparison of survival rates between patients with pN1mi (micrometastasis), pN0(i+) (isolated tumor cells), and node-negative disease.
Main Results:
- Micrometastases (pN1mi) were found in 6.6% of patients, and isolated tumor cells (pN0(i+)) in 1.9%.
- No significant survival difference was observed for patients with micrometastases or isolated tumor cells compared to node-negative disease.
- Survival remained similar after adjusting for age, tumor stage (pT), grade, and adjuvant systemic therapy.
Conclusions:
- The presence of micrometastases or isolated tumor cells in sentinel nodes has minimal impact on breast cancer overall survival in the initial years.
- Current findings suggest that SNB micrometastases do not significantly alter short-term breast cancer prognosis.
