| Summary: | The article is devoted to the development and evaluation of the effi ciency of photodynamic therapy (PDT) with photosensitizer photolon with additional interstitial laser irradiation in patients with head and neck basal cell skin cancer (BCSC). Treatment was performed in 55 patients. On the fi rst stage, all patients underwent photodynamic therapy with interstitial irradiation using fl exible optical fi bers with cylindrical diffuser, on the second stage PDT with distant delivery of laser at a dose of 50-300 J/cm2 was carried out. During the follow- up period of 6 months to 4 years in 13 (23.6%) of the 55 patients a recurrence of the disease was diagnosed. A higher rate of recurrence was in the group of patients who underwent PDT for recurrent neoplasms compared with patients with primary disease (37.5% and 4.3%, respectively), in patients with endophytic growth of the tumor compared to patients with exophytic component (30.0% and 16.0%,respectively) and in patients with large tumors (up to 2.0 cm – 14.3%, from 2.0 to 5.0 cm – 16.7% and more than 5.0 cm – 54.4%).
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