Popliteal sentinel lymph node involvement in melanoma patients

Area of Science:

• Oncology
• Surgical Pathology
• Dermatology

Background:

• Sentinel lymph nodes (SLN) in popliteal basins are uncommon, with debated origins, management, and outcomes.
• Popliteal SLN drainage presents unique challenges in melanoma staging and prognosis.

Purpose of the Study:

• To correlate clinical and pathological features of popliteal basin lymphatic drainage.
• To analyze the impact of popliteal lymph node drainage on patient survival outcomes.

Main Methods:

• Retrospective analysis of SLN biopsies conducted at a single institution from 2000 to 2010.
• Evaluation of 247 SLN biopsies in patients with lower limb melanoma.

Main Results:

• Twenty-seven patients (11%) exhibited popliteal drainage, with three (11%) having popliteal metastasis.
• Popliteal drainage was associated with significantly worse 5-year disease-free survival (DFS) (P=0.028).
• Multivariate analysis identified Breslow thickness, mitotic index, and positive SLN as prognostic factors for DFS.

Conclusions:

• Popliteal lymphatic drainage in melanoma patients appears to correlate with adverse prognostic indicators.
• The presence of popliteal SLN metastasis may signify a more aggressive tumor profile.