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Occult axillary lymph node metastases in "node-negative" breast carcinoma
I A Nasser1, A K Lee, S Bosari
1Department of Anatomic Pathology, Lahey Clinic Medical Center, Burlington, MA 01805.
Human Pathology
|September 1, 1993
Summary
Occult axillary nodal metastases in node-negative breast cancer patients were evaluated. Small metastases (<0.2 mm) or those detected only by immunostaining have minimal prognostic value, unlike larger deposits.
Area of Science:
- Oncology
- Pathology
- Breast Cancer Research
Background:
- Accurate staging of invasive breast carcinoma is crucial for prognosis.
- Identifying occult axillary nodal metastases in node-negative patients is challenging.
- The prognostic significance of small or single-cell metastases remains unclear.
Purpose of the Study:
- To evaluate the presence and prognostic impact of occult axillary nodal metastases in node-negative invasive breast carcinoma.
- To determine if hematoxylin-eosin staining and keratin immunostaining detect metastases with different prognostic values.
- To assess the correlation between occult metastases and other prognostic factors.
Main Methods:
- Analysis of 159 node-negative invasive breast carcinoma patients.
- Examination of lymph nodes using hematoxylin-eosin staining and keratin immunostaining.
- Categorization of occult metastases by size (<0.2 mm vs. >0.2 mm) and detection method.
Main Results:
- Occult nodal metastases were found in 31% of patients (28% by H&E, 14% by immunostaining).
- Metastases >0.2 mm correlated with worse recurrence and survival rates.
- Metastases <0.2 mm or detected only by immunostaining showed comparable survival to node-negative patients.
Conclusions:
- Occult metastases <0.2 mm, especially single cells, lack significant prognostic value.
- Immunohistochemical detection of such small metastases is likely unnecessary.
- Larger metastases and extranodal involvement may be prognostically significant but are infrequent in this cohort.