Open-Label Safety Study to Evaluate Imiquimod Cream, 5% for Large Areas of Actinic Keratosis

This was a Phase 4, open-label, single-arm, multicenter study in male and female subjects aged 18 years or older with clinically diagnosed AK lesions, conducted at 31 investigational sites in the United States.

This study assessed the safety of imiquimod as a treatment for AK applied in doses ranging from one packet 12.5 mg) to 6 packets (75 mg) to either single or multiple body regions for up to 3 cycles, depending upon treatment success and AK lesion recurrence. Eligible subjects applied imiquimod 5% cream prior to normal sleeping hours 2 days per week to at least 4 clinically typical, visible, discrete, nonhypertrophic AK lesions in contiguous or noncontiguous treatment areas totaling greater than 25 cm2 at baseline. Multiple treatment areas could be exposed (i.e., head, torso and/or extremities), with the number of packets determined by the investigator but not to exceed one packet for each 25 cm2 treatment area, up to a maximum of 6 packets per dose. In each treatment cycle, dosing was to continue for 16 weeks (approximately 4 months), as instructed by the investigator, followed by a 2-month, treatment-free follow-up period.

Inclusion criteria

• Are at least 18 years of age.
• Have greater than 25 cm2 total treatment area(s) containing at least 4 actinic keratosis lesions.

Exclusion criteria

• Have any skin condition in the treatment area that may be made worse by treatment with imiquimod (e.g., rosacea, psoriasis, atopic dermatitis, eczema).
• Have received specific treatments/medications in the treatment area(s) within the designated time period prior to study treatment initiation.