How important is the pathological margin distance in vulvar cancer?

Purpose: The ideal pathological margin in vulvar squamous cell carcinoma (VSCC) is still debated. Our aim was to analyze the value of tumor-free pathological margin distance with regard to local recurrence in VSCC.
Methods: We analyzed a series of 205 patients who were treated for VSCC from January 1980 to November 2007. Patients were categorized into 3 groups, based on pathological free margin (PFM): <3 mm (n = 18); ≥3 and <8 mm (n = 61); and ≥8 mm (n = 126).
Results: The median age was 69 years. The median PFM was 10 mm (range: 1-65). Of 168 patients who underwent lymphadenectomy, 64 (38.1%) developed LN metastasis. After a median follow-up of 36.2 months, 78 (38%) cases recurred-47 (60.2%) experienced a local recurrence (LR). LR occurred in 16.7% of patients with a PFM of <3 mm, 24.6% with a PFM ≥3 and <8 mm, and 22.2% of those with a PFM ≥8 mm (p = 0.77). PFM did not correlate with LR when analyzed continuously (p = 0.98). The 5-year disease-free survival (DFS) for LR was 79.6%. Margin distance did not negatively impact DFS (p = 0.94); the presence of perineural invasion was the only variable that negatively influenced DFS (p = 0.009).
Conclusions: Although our results suggest no correlation between LR and pathological margin distance, the tumor-free resection margin remains significant with regard to locoregional control in vulvar cancer. A more conservative surgical approach may be considered in certain situations, such as margins near the clitoris, urethra, and anus.
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