A matter of margins: Surgical and pathologic risk factors for recurrence in extramammary Paget's disease

Highlights

  • Positive margins after primary surgery for EMPD conferred higher recurrence risk.
  • Compared to MMS, WLE was significantly more likely to result in positive margins.
  • With negative margins, there is a trend toward higher recurrence risk after WLE compared to MMS.
  • Males were more likely than females to undergo MMS for EMPD.

Abstract

Objectives

To determine surgical and pathologic variables associated with recurrence in extramammary Paget's disease (EMPD).

Methods

Medical records of patients seeking care for EMPD from 1/1992–9/2015 were reviewed. Follow-up was restricted to 5 years following primary surgery. Recurrence-free survival (RFS) was estimated using the Kaplan-Meier method. Risk factors were evaluated for an association with recurrence and positive margins, respectively, using Cox proportional hazards regression and logistic regression.

Results

Of 154 patients, 90 (58.4%) were female and 65 (41.6%) were male. Treatment consisted of wide local excision (WLE, includes WLE or radical vulvectomy, 77.3%), Mohs micrographic surgery (MMS, 19.5%), and abdominoperineal resection (3.2%). RFS at 1, 3, and 5 years was 84.5% (95% confidence interval (CI), 78.2–91.4%), 66.1% (95% CI, 57.5–75.9%), and 56.1% (95% CI, 46.9–67.1%), respectively. Positive surgical margins were univariately associated with higher risk of recurrence (HR 3.55, 95% CI 1.74, 7.24). Margin status significantly correlated with procedure type (33.3% vs. 3.4% had positive margins with WLE vs. MMS, p = 0.01). Among patients with negative margins, there was a 2.5 fold increased risk of recurrence after WLE compared to MMS (95% CI, 0.57–10.9, p = n.s.).

Conclusion

Inclusion of males allowed us to examine the influence of a different surgical approach (MMS) on margin status and recurrence rates in EMPD. In contrast to prior studies including solely vulvar EMPD, we observed strong association between margin status and recurrence risk. Risk of positive margins was significantly higher after WLE compared to MMS. MMS should be explored to improve outcomes in gynecologic patients with EMPD.