# Sentinel Node Biopsy in Laryngeal Cancer: A Systematic Review and Meta-Analysis

## TL;DR

This study reviews and analyzes the effectiveness of sentinel node biopsy in laryngeal cancer, finding it reliable for staging, especially for supraglottic tumors.

## Contribution

The paper provides a systematic review and meta-analysis of sentinel lymph node biopsy accuracy in laryngeal SCC, comparing tumor location and mapping materials.

## Key findings

- SLN detection rate was 90.8% with a sensitivity of 88% in laryngeal SCC.
- Supraglottic tumors showed higher detection rates (93.7%) and sensitivity (96%) compared to transglottic tumors.
- Radiotracers outperformed blue dye in both detection rates and sensitivity.

## Abstract

Background: Sentinel lymph node (SLN) biopsy offers a minimally invasive approach to staging lymph node involvement in laryngeal squamous cell carcinoma (SCC). Despite its adoption in other cancers, its accuracy in laryngeal SCC remains under investigation. This systematic review and meta-analysis evaluates the diagnostic performance of SLN mapping in laryngeal cancer. Methods: A systematic search of MEDLINE, Scopus, and Google Scholar was conducted using the keywords “(larynx OR laryngeal) AND sentinel”, with no date or language restrictions. Studies reporting SLN detection rates and/or sensitivity in laryngeal SCC were included. A random-effects model was applied for data pooling, and subgroup analyses were performed based on tumor location (supraglottic versus transglottic) and mapping material (radiotracer versus blue dye). Publication bias was assessed using funnel plots and statistical methods. Results: Nineteen studies, encompassing 366 patients, were analyzed. The overall pooled SLN detection rate was 90.8% (95% CI: 86–94.1), and sensitivity was 88% (95% CI: 81–94). Supraglottic tumors demonstrated superior outcomes (detection rate: 93.7%, sensitivity: 96%) compared to transglottic tumors (detection rate: 84.7%, sensitivity: 71%). Radiotracers significantly outperformed blue dye, with detection rates of 90.8% versus 81.5% and sensitivities of 88% versus 77%. Conclusions: SLN mapping is a reliable technique for staging laryngeal SCC, particularly for supraglottic tumors, where high detection rates and sensitivity were observed. Radiotracers offer superior performance compared to blue dye, underscoring their clinical value. These findings support the feasibility and accuracy of SLN biopsy in laryngeal cancer, while emphasizing the importance of tumor location and mapping material.