Vulvar Paget disease: A national retrospective cohort study.

Background: Vulvar Paget disease (VPD) is a rare skin disorder that is considered premalignant.

Objective: To assess the clinical course, treatment schedules, and effect of invasion and treatment on recurrence and survival in patients with VPD.

Methods: Data on women with VPD were retrieved from the medical files and pathology reports in all Dutch tertiary university medical centers. Disease-free survival and 5-year disease-specific survival were estimated by using Kaplan-Meier curves.

Results: Data on 113 patients whose VPD was diagnosed between 1991 and 2016 were analyzed; 77% had noninvasive VPD. Most of the women (65%) underwent a surgical procedure. Recurrences were reported in 40%. Of the women with noninvasive VPD, 8% developed invasion. There were no disease-specific deaths reported in the women with noninvasive VPD. The 5-year disease-specific survival rate was greater than 98% in noninvasive and microinvasive VPD, but significantly worse in invasive VPD (50% [P < .0005]).

Limitations: The main limitations of this study are its retrospective character and the fact that original pathology samples were not available for reassessment.

Conclusions: VPD is extremely rare, and the recurrence rates are high. Most patients have noninvasive VPD, which does not affect survival and should be considered a chronic disorder with limited invasive potential. In cases of invasive disease, survival decreases significantly.