Sentinel Lymph Node Biopsy in Small Papillary Thyroid Cancer: A Meta-analysis

Area of Science:

• Oncology
• Surgical Pathology
• Nuclear Medicine

Background:

• Papillary thyroid cancer (PTC) management involves accurate staging.
• Sentinel lymph node biopsy (SNB) is crucial for staging PTC.
• Various techniques exist for sentinel lymph node (SLN) detection.

Purpose of the Study:

• To compare the sentinel lymph node detection rate (SDR) of different techniques in PTC.
• To evaluate the effectiveness of various SLN detection methods.

Main Methods:

• A systematic literature search was conducted on MEDLINE via PubMed.
• Studies were categorized by SLN detection technique: vital-dye (VD), Tc-nanocolloid lymphoscintigraphy (LS), LS + VD, and LS with SPECT/CT (LS-SPECT/CT).
• Pooled SDRs and false-negative rates were calculated and compared.

Main Results:

• Forty-five studies were analyzed.
• Overall SDRs were: VD 83%, LS 96%, LS + VD 87%, and LS-SPECT/CT 93%.
• False-negative rates varied by technique, with LS-SPECT/CT showing lower rates (7%-8%) compared to others.

Conclusions:

• Tc-nanocolloid-based techniques yield higher SDRs in PTC compared to vital-dye methods.
• The integration of SPECT/CT enhances the detection of metastatic SLNs, particularly those outside the central neck region.