A Dose-Finding Study of Resiquimod Evaluating Safety and Efficacy in Patients with Multiple Actinic Keratosis Lesions

Prospective, randomized, partly blinded, in part placebo-controlled, multicenter dose-finding trial with patients suffering from AK. Patients were observed for efficacy, local tolerability and safety. A total of 14 sites in Switzerland and Germany enrolled male and female patients over 18 years of age with clinically diagnosed AK lesions Patients were randomized to receive resiquimod gel (Treatment Arms 1, 2, 3, 4, or 5) or matching vehicle (Treatment Arms 1-Pla, 2-Pla, or 3-Pla):

Treatment Arms 1, 2 and 3: The patient was randomly assigned to one of three treatment groups and within each group there was one randomly assigned placebo patient for every two treatment patients (parallel-group randomization; 2:1 active vs placebo).

Treatment Arms 4 and 5: The patient was randomly assigned to one of two treatment groups (parallel-group randomization, 1:1).

Inclusion Criteria:

• Signed informed consent
• Male or nonpregnant, nonlactating female, ≥18 years
• A minimum of 2 clinically diagnosed AK-lesions within a defined area (25 cm2 contiguous treatment area). One AK-lesion must have a diameter of at least 6 mm (indicator lesion)
• AK-lesions on balding scalp, forehead or face

Exclusion Criteria:

• Known allergy or hypersensitivity to any of the trial gel ingredients
• Dermatological disease or condition that might be exacerbated by resiquimod gel treatment or may impair trial assessments
• Evidence of unstable or uncontrolled clinically significant medical conditions, active infection, immunosuppression or systemic cancer