Does sentinel lymph node biopsy have a role in node-positive head and neck squamous carcinoma?

Area of Science:

• Oncology
• Surgical Oncology
• Head and Neck Cancer Research

Background:

• Clinical overstaging of cervical nodes is a challenge in head and neck squamous cell carcinoma (SCC).
• Sentinel lymph node biopsy (SLNB) is a technique used to improve staging accuracy.
• Evaluating SLNB's efficacy in developing countries is crucial due to resource limitations.

Purpose of the Study:

• To assess the utility of SLNB in reducing clinical overstaging of cervical nodes in head and neck SCC.
• To determine the diagnostic accuracy of SLNB in a developing world context.
• To evaluate if SLNB can replace comprehensive neck dissection in specific patient groups.

Main Methods:

• The study involved 33 patients with T1-4 N0-3 SCC of the oral cavity or oropharynx.
• Sentinel and echelon lymph nodes were identified using lymphoscintigraphy, gamma probe, and blue dye.
• Histological analysis of lymph nodes was performed, comparing SLNB status with the entire neck dissection specimen.

Main Results:

• In clinically node-negative (N0) patients, SLNB demonstrated 100% sensitivity and 100% negative predictive value (NPV).
• In clinically node-positive (N+) patients, SLNB sensitivity was 71% and NPV was 60%.
• The accuracy of SLNB in clinically N+ necks was insufficient to avoid comprehensive neck dissection.

Conclusions:

• SLNB is highly accurate for staging clinically node-negative head and neck SCC.
• SLNB's accuracy is currently inadequate for clinically node-positive cases.
• Comprehensive neck dissection remains necessary for clinically N+ patients in this setting.