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Contralateral internal mammary node invasion in breast cancer: lymphoscintigraphic data
1Service of Nuclear Medicine, Institut Jules Bordet, Université Libre de Bruxelles, Brussels, Belgium.
Breast (Edinburgh, Scotland)
|February 18, 2004
Summary
Contralateral internal mammary node invasion occurs in 15.6% of breast cancer patients. Bilateral internal mammary node involvement may indicate a worse prognosis and higher risk of systemic metastasis.
Area of Science:
- Oncology
- Surgical Oncology
- Medical Imaging
Background:
- Internal mammary (IM) lymph node chains are a potential site for breast cancer metastasis.
- Assessing contralateral IM node involvement is crucial for accurate staging and treatment planning.
Purpose of the Study:
- To investigate the incidence and prognostic significance of contralateral internal mammary lymph node invasion in breast cancer patients.
Main Methods:
- Lymphoscintigraphy (LySc) was used to examine both left and right internal mammary lymph node chains in 1025 patients.
- Abnormalities on LySc indicated metastatic involvement.
- Patient groups were analyzed based on homolateral and bilateral IM lymph node abnormalities.
Main Results:
- Contralateral IM lymphoscintigrams were abnormal in 15.6% of patients.
- One-third of cases with homolateral IM abnormalities also showed contralateral involvement.
- While overall survival was similar, matched analysis revealed a higher incidence of systemic metastatic disease in patients with bilateral IM node involvement.
Conclusions:
- Contralateral internal mammary node metastasis is a significant finding in breast cancer.
- Bilateral internal mammary node involvement may portend a worse prognosis compared to isolated homolateral disease.
- Further investigation into the clinical implications of contralateral IM node status is warranted.