Supplementary Material for: Brodalumab is Effective for Psoriasis Patients with Difficult-to-treat Body Regions: Results from an Observational Clinical Study

Introduction: Brodalumab, a human monoclonal antibody that selectively inhibits the interleukin (IL)-17 receptor subunit A, has been approved for the treatment of moderate-to-severe plaque psoriasis. The treatment benefit of brodalumab has been clearly demonstrated in multiple clinical studies. However, data on effectiveness for difficult-to-treat body regions, especially in everyday clinical practice, are still limited.
Methods: In this exploratory observational clinical study, psoriasis patients suffering from nail and scalp involvement who received brodalumab during routine clinical care were enrolled at 7 centers in Germany. Patients were observed over 60 weeks. The co-primary endpoints were 75% improvement in Psoriasis Scalp Severity Index (PSSI75) at week 12 and 75% improvement in Nail Psoriasis Severity Index (NAPSI75) at week 24. Secondary endpoints included assessment of general skin and disease outcomes, quality-of-life, and patient satisfaction with treatment.
Results: Eighty-seven patients were included. Mean age was 46.8 years, 70.1% patients were male, and mean body mass index was 28.9 kg/m². The co-primary endpoints were achieved by more than 90% of patients who met criteria for effectiveness analyses (n=62): 93.6% of patients achieved PSSI75 at week 12 and 90.3% of patients achieved NAPSI75 at week 24. Median body surface area involvement improved from 14% at baseline to 1.5% and 1% at weeks 12 and 24, respectively. Median Dermatology Life Quality Index scores improved from 16 at baseline to 2 and 1 at weeks 12 and 24, respectively. Improvements were maintained in the majority of patients throughout the 60-week study. Brodalumab was well tolerated and patients were highly satisfied with treatment.
Conclusion: Outcomes assessed in this study, including assessments of scalp and nail symptoms, improved following initiation of brodalumab therapy. This study of psoriasis patients in a real-world setting supports the long-term clinical effectiveness of brodalumab on difficult-to-treat body regions.