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Clinical significance of microscopic melanoma metastases in the nonhottest sentinel lymph nodes
Su Luo1, Alice Z C Lobo2, Kenneth K Tanabe3
1Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston.
JAMA Surgery
|April 2, 2015
Summary
Removing non-hottest sentinel lymph nodes is crucial for accurate melanoma staging. Microscopic metastases in these nodes significantly correlate with disease progression and mortality, impacting patient survival rates.
Area of Science:
- Oncology
- Surgical Pathology
- Dermatology
Background:
- A practice gap exists in sentinel lymph node (SLN) biopsy for melanoma, with variability in the number of SLNs removed.
- Current protocols range from removing only the hottest SLN to removing all nodes with radioactivity above 10% of the hottest node.
Purpose of the Study:
- To assess the clinical significance of melanoma metastases in non-hottest SLNs.
- To determine the risk of disease progression based on SLN status and primary tumor characteristics.
Main Methods:
- Retrospective review of 475 consecutive cutaneous melanoma patients undergoing SLN biopsy.
- Analysis of 1575 SLNs, recording radioactivity counts, metastasis presence, and primary tumor characteristics.
- Mean follow-up of 59 months, with data collection through 2012.
Main Results:
- 19% of patients had positive SLNs; 21% of positive SLNs were missed if only the hottest node was removed.
- Melanoma progression occurred in 43% of patients with any positive SLN, irrespective of hottest node status.
- Primary tumor mitogenicity and positive SLN status were associated with increased mortality and decreased survival.
Conclusions:
- Microscopic melanoma metastases in non-hottest SLNs are clinically significant and associated with disease progression and mortality.
- Complete SLN removal is essential for accurate staging and risk stratification in melanoma patients.
- Addressing this practice gap improves surgical management and patient outcomes.
