The efficacy of a photolyase-based device on the cancerization field: a clinical and thermographic study

BACKGROUND At skin level, a cancerization field (CF) indicates some chronically photoexposed areas in which, besides a primary tumor, histological or biomolecular modifications without clinical signs are present. Active telethermography (ATT) allows us to observe the imaging of a hyperthermic halo (HH) surrounding the tumor . The Authors hypothesize HH as a possible expression of CF. OBJECTIVES The aim of this study were to verify whether HHs have the same histological or immunohistochemical characteristics as the CF and, secondly, to evaluate the efficacy of a device containing the enzyme photolyase in modifying thermographic parameters in these area. METHODS The study included 30 patients affected by actinic keratosis, evaluated clinically and by ATT at time 0 and after 3, 6 and 9 months. RESULTS The ATT showed the presence of HHs in all the patients and, after the treatment, a significant modification of both the extension of these areas and the thermal parameters. In 5 patients for whom, while operated, two other biopsies were performed, respectively on the HH and on a perilesional non-hyperthermic area, in the HH, we detected a p53 and Ki 67 over-expression. CONCLUSIONS Our results indicate that ATT could represent a useful paraclinic method in identifying CFs in subjects at risk.