Longitudinal study of prognostic factors for localized cutaneous melanoma in patients who have been disease-free for five years.

Most relapses in melanoma patients occur during the first five years after diagnosis. Identifying characteristics associated with recurrence after this period could help delineate guidelines, specifically for follow-up protocols. Objectives: The aim of this study was to identify the prognostic factors for relapse and death caused by melanoma in patients who have been disease-free for five years. We designed a longitudinal retrospective cohort to study Stage I/II cutaneous melanoma patients who have been free of disease for more than five years (late relapse cohort). Prognostic factors for disease-free and melanoma-specific survival were evaluated using the Kaplan-Meier method and Cox regression models. A series of 746 patients who had Stage I-II cutaneous melanoma and were free of disease for five years was selected. After a median follow-up of 64 months (124 months since melanoma diagnosis), 51 (6.8%) patients relapsed and 18 (2.4%) died from melanoma. Acral location and presence of ulceration, as well as intermediate growth rate (0.11-0.50 mm/month), were significantly associated with relapse or death due to melanoma. The initial recurrence site was associated with distant metastasis in 48% of the cases. In this study, we have identified melanoma characteristics in patients who have been disease-free for five years that may allow us to establish groups at increased risk of relapse or death due to melanoma, which could be helpful for melanoma management.