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Sentinel lymph nodes in malignant melanoma: extended histopathologic evaluation improves diagnostic precision
Helene Nortvig Abrahamsen1, Stephen J Hamilton-Dutoit, Jørn Larsen
1Institute of Pathology, Aarhus Kommunehospital, Aarhus University Hospital, Aarhus, Denmark. abrahamsen@dadlnet.dk
Cancer
|April 10, 2004
Summary
Enhanced histopathology for melanoma sentinel lymph nodes (SNs) significantly improves micrometastasis detection. This method approaches molecular assay sensitivity, reducing false positives from benign inclusions.
Area of Science:
- Oncology
- Pathology
- Surgical Oncology
Background:
- Sentinel lymph node (SN) assessment in melanoma is critical for staging and treatment decisions.
- Discrepancies exist between molecular analysis and routine histopathology for detecting SN micrometastases.
- Investigating reasons for these discrepancies and improving histopathologic diagnostic precision is essential.
Purpose of the Study:
- To identify reasons for the discrepancy in sentinel lymph node (SN) micrometastasis detection between molecular and histopathologic methods.
- To evaluate if an extended histopathologic protocol enhances diagnostic accuracy in melanoma SNs.
Main Methods:
- A cohort of 100 patients with cutaneous melanomas underwent SN biopsy.
- Two hundred thirty-one SNs were bisected, with one half analyzed using serial sectioning and immunohistochemistry (S-100, HMB-45, Melan-A).
- The study compared findings with molecular analysis results.
Main Results:
- Melanocytic lesions, including micrometastases and benign nevus inclusions (BNI), were found in 28% of SNs.
- Melan-A was the most sensitive marker, positive in 97% of micrometastasis-positive and 100% of BNI-positive SNs.
- Extended histopathology identified micrometastases and BNI in SNs at rates approaching molecular detection levels.
Conclusions:
- Extensive serial sectioning with immunohistochemistry significantly improves the histopathologic detection of micrometastases and BNI in melanoma SNs.
- This enhanced histopathologic approach approaches the sensitivity of molecular techniques.
- A high rate of benign nevus inclusions (BNI) can lead to false positives in non-morphologic SN assays.