Safety and Efficacy Study for the Field-directed Treatment of Actinic Keratosis (AK) With Photodynamic Therapy (PDT)

BF-200 ALA was applied over 1-2 fields of approximately 20 cm² in total, allowed to dry for approximately 10 minutes, and covered with occlusive tape material for 3 h.

The reference product was a placebo (a nanoemulsion gel formulation similar to the Investigational Medicinal Product (IMP), but without the active ingredient). The placebo was packaged, assigned to each patient, and administered in the same way as the IMP.

After cleaning the lesions, the entire treatment field(s) were illuminated using the novel narrow spectrum BF-RhodoLED lamp, a red light illumination source (approximately 635 nm) developed by Biofrontera, until a total light dose of 37 J/cm² (per treated field) was achieved.