Identification of Predictive Factors for Post-operative Recurrence and Clinical Outcomes of Primary Vulvar Extramammary Paget Disease

Background/Aim: Data regarding the clinicopathological factors predicting recurrence and prognosis in patients with vulvar extramammary Paget disease (VPD) are limited. Therefore, we aimed to identify predictive factors for recurrence and outcomes in patients with VPD.Patients and Methods: Forty-five patients with VPD were included in this study. We reviewed electronic medical records and pathology slides to collect clinicopathological information.Results: Eighteen cases (40.0%) had resection margin (RM) involvement. Twelve patients (26.7%) received adjuvant radiation therapy (RT). Ten patients (22.2%) experienced recurrence. The recurrence rate was higher in patients who underwent wide local excision or simple vulvectomy than in those who underwent radical vulvectomy. Positive RM involvement was a significant and independent predictive factor for worse recurrence-free survival (RFS). The overall survival rate of patients who received adjuvant RT was significantly higher than that of those who underwent surgery alone.Conclusion: A positive RM involvement independently predicted worse RFS. The recurrence rate was significantly associated with the type of surgical procedure performed. Additionally, adjuvant RT can improve the prognosis of patients with VPD.