Long-term recurrence of nonmelanoma skin cancer after topical methylaminolevulinate photodynamic therapy in a dermato-oncology department.

Background: Most available studies on the efficacy of topical photodynamic therapy focus on short-to medium-term results. Long-term data are scarce.

Objective: To evaluate the long-term efficacy of photodynamic therapy with topical methylaminolevulinate to treat Bowen's disease and basal cell carcinoma in the clinical practice setting of a dermato-oncology department.