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Antimony concentrations in nodal tissue can confirm sentinel node identity
Richard A Scolyer1, John F Thompson, Ling-Xi L Li
1Sydney Melanoma Unit, Royal Prince Alfred Hospital, Camperdown, NSW, Australia. richard.scolyer@email.cs.nsw.gov.au
Summary
Measuring antimony in sentinel nodes confirms their identity. This technique, using inductively coupled plasma mass spectrometry, helps reduce false negatives in melanoma staging.
Area of Science:
- Oncology
- Surgical Pathology
- Analytical Chemistry
Background:
- Sentinel node biopsy is crucial for accurate melanoma staging.
- Confirming 'true' sentinel node identity is vital to minimize false-negative rates.
- Antimony from lymphoscintigraphy can be detected in sentinel nodes.
Purpose of the Study:
- To validate antimony concentration measurement for confirming sentinel node identity.
- To differentiate true sentinel nodes from non-sentinel nodes using antimony levels.
- To assess the utility of inductively coupled plasma mass spectrometry in this process.
Main Methods:
- Analysis of 24 patient pairs with tumor-positive sentinel and tumor-negative non-sentinel nodes.
- Inductively coupled plasma mass spectrometry (ICP-MS) to measure antimony concentrations in 50 µm tissue sections.
- Comparison of antimony levels between confirmed sentinel and non-sentinel nodes.
Main Results:
- Significantly higher median antimony concentrations (0.526 ppb) in sentinel nodes versus non-sentinel nodes (0.043 ppb) (P = 0.004).
- Four cases showed low antimony levels in presumed sentinel nodes, indicating potential misidentification.
- ICP-MS effectively distinguished between sentinel and non-sentinel nodes based on antimony content.
Conclusions:
- Antimony concentration measurement via ICP-MS reliably confirms sentinel node identity.
- This method validates the sentinel node biopsy technique and can improve staging accuracy for melanoma.
- The findings suggest a potential method to reduce false-negative results in sentinel node biopsies.