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Updated: Aug 2, 2026
11:13
Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland
Published on: December 1, 2015
Summary
Intramammary lymph nodes are present in 28% of operable breast cancers, with 10% showing metastasis. These nodes impact prognosis, especially in early-stage disease, suggesting a potential new staging classification.
Area of Science:
- Oncology
- Pathology
- Radiology
Background:
- Intramammary lymph nodes (IMLNs) are a potential site for breast cancer metastasis.
- Their prevalence and impact on prognosis require further investigation.
Purpose of the Study:
- To investigate the incidence and significance of intramammary lymph nodes in primary operable breast carcinoma.
- To determine the relationship between IMLNs and breast cancer staging and prognosis.
Main Methods:
- Radiographic, gross, and histopathologic examination of 158 whole breasts with primary operable carcinoma.
- Analysis of the location and metastatic status of identified intramammary lymph nodes.
Main Results:
- Intramammary lymph nodes were identified in 28% of cases, with 10% containing metastatic carcinoma.
- Metastatic IMLNs were found in all breast quadrants, not always correlating with the primary tumor location or typical lymphatic drainage.
- Positive IMLNs did not affect prognosis in Stage II carcinoma but indicated advanced disease and higher likelihood of axillary metastasis.
- A trend toward poorer prognosis was observed in Stage I lesions with positive IMLNs.
Conclusions:
- Intramammary lymph nodes can harbor metastatic breast cancer.
- Positive IMLNs in Stage I disease may indicate a prognosis similar to Stage II disease.
- The findings suggest a potential for a new staging classification (Stage Ia) for cases with positive IMLNs but negative axillary lymph nodes.
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