Clinicopathologic features and surgical management in vulvovaginal melanoma – A retrospective single-center study

Abstract

Background and AimsVulvovaginal melanoma is a rare malignancy characterized with poor prognosis. The aim of this study was to review vulvovaginal melanoma patients treated in Helsinki University Hospital. Objective was to evaluate the clinicopathologic features, treatment and factors affecting outcome. MethodsSingle-center retrospective review on patients treated between 2001 and 2021 was conducted. Data were collected from medical records. Clinicopathologic features, treatment, survival, and prognostic factors were analyzed. ResultsA total of 21 patients were included in the analysis. Localization was vulvar in 86% (n=18) and vaginal in 14% (n=3). Median age at diagnosis was 80 years. Initial treatment included surgery in 18 patients (86%); wide local excision in 19%, radical excision in 62%, and pelvic exenteration in 4.8%. Negative margins were achieved in 83% (n=15). Eleven (52%) patients underwent inguinal treatment: sentinel lymph node biopsy in 33%, direct lymphadenectomy in 14%, and both in 4.8%. Nine patients experienced melanoma recurrence. Recurrences were locoregional (n=1), distant (n=4), and both locoregional and distant (n=4). Median disease-free survival was 18.9M and median overall survival (OS) was 36.5M. 5-year relative OS was 20%. Melanoma was cause of death for seven patients (33%). Vaginal localization tended to worsen prognosis. Nodal status was the only melanoma characteristic significantly associated with survival. Surgical radicality did not affect survival. ConclusionsVulvovaginal melanoma is associated with an extremely poor survival and high rates of recurrence, primarily involving distant metastasis. In local control, wide local excision seems to be viable alternative to more radical surgery. Nodal status is a key prognostic factor emphasizing the importance of further research into the applicability of sentinel lymph node biopsy for vulvovaginal melanoma.