Efficacy and Safety Trends with Continuous, Long-Term Crisaborole Use in Patients Aged ≥ 2 Years with Mild-to-Moderate Atopic Dermatitis.

ABSTRACT

INTRODUCTION: Atopic dermatitis (AD) is a chronic inflammatory skin disease often requiring long-term treatment. Crisaborole significantly improved global AD signs and symptoms in 28-day phase 3 studies of patients aged ≥ 2 years with mild-to-moderate AD (Investigator's Static Global Assessment [ISGA] 2 or 3). A post hoc analysis of a long-term, open-label extension study was conducted to assess efficacy and safety trends of crisaborole in patients stratified by the number of initial consecutive crisaborole treatment cycles, defined as the number of treatment cycles completed before achievement of ISGA 0 (clear)/1 (almost clear). METHODS: Patients completing phase 3 studies without drug-related safety issues that precluded further crisaborole treatment were analyzed. Patients with ISGA 0/1 at baseline (the end of a 28-day cycle) did not receive crisaborole for the next 28-day cycle (off-treatment), whereas patients with ISGA ≥ 2 received crisaborole for the next 28-day cycle (on-treatment). Patients were stratified by number of initial consecutive crisaborole treatment cycles. Efficacy was assessed by achievement and maintenance of ISGA 0/1, and safety was assessed by incidence of treatment-emergent adverse events (TEAEs) and treatment-related AEs (TRAEs). RESULTS: Overall, 418 patients were included in exclusive cohorts based on number of consecutive on-treatment cycles (1 on-treatment cycle, n = 133; 2 consecutive on-treatment cycles, n = 106; 3 consecutive on-treatment cycles, n = 106; 4 consecutive on-treatment cycles, n = 73). After one to four initial consecutive on-treatment cycles, 77.6, 76.3, 59.4, and 43.1% of patients, respectively, achieved ISGA 0/1. Of these patients, 49.5, 37.8, 44.4, and 45.2%, respectively, maintained ISGA 0/1 at the end of a 28-day cycle off-treatment. Incidence of TRAEs was 4.5, 4.7, 3.8, and 1.4% for patients receiving one to four consecutive on-treatment cycles, respectively. One patient discontinued because of AEs. CONCLUSION: These results support the efficacious and safe continuous, long-term use of crisaborole for the management of mild-to-moderate AD. TRIAL REGISTRATION ClinicalTrials.gov NCT02118766, NCT02118792.

Eczema is a skin disease that often requires long-term treatment. Crisaborole ointment improved mild-to-moderate eczema after 28 days of continuous use in two phase 3 clinical trials that included patients aged ≥ 2 years. In the study reported here we tested whether eczema improved with continuous crisaborole use after one to four back-to-back treatment periods, or 28­112 days. Patients who completed either of the aforementioned phase 3 clinical trials were included in this study. Patients received crisaborole for the next 28-day period if they had eczema rashes. Patients with clear or almost clear skin did not receive crisaborole for 28 days. Our study included a total of 418 patients. After one to four treatment periods, 78, 76, 59, and 43% of patients, respectively, had clear or almost clear skin. Of these patients, 50, 38, 44, and 45% still had clear or almost clear skin after stopping treatment for 28 days. Fewer than one in 20 patients had side effects related to crisaborole after one to four treatment periods. The most common side effect at the application site that was related to crisaborole was pain, particularly stinging and burning. Up to one in 50 patients had application site pain. One patient stopped taking crisaborole because of side effects. In conclusion, these results suggest that long-term crisaborole use is effective and safe.