Effectiveness and safety of adalimumab in treating moderate to severe psoriasis patients with psoriatic arthritis in Taiwan

Background/ObjectiveThe incidence of psoriasis vulgaris in Asians is estimated at 0.05–0.30%. Studies in North America and Europe demonstrated that adalimumab, a fully human monoclonal IgG1 antibody, is an efficacious treatment for psoriatic arthritis and chronic plaque psoriasis. The aim of this study was to evaluate the efficacy and safety of adalimumab in treating psoriatic arthritis (PsA) in patients who have moderate to severe psoriasis.MethodsThis was a retrospective study comprising 12 patients with chronic plaque psoriasis and psoriatic arthritis who were treated with adalimumab between October 2008 and February 2013. All had failed treatment with conventional systemic agents. Patients were started on adalimumab 40 mg every other week.ResultsAt week 12, 3 of 12 patients (25%) achieved a 75% improvement in their Psoriasis Area and Severity Index (PASI 75). With regard to PsA, at week 12, the improved Psoriatic Arthritis Response Criteria (PsARC) response was experienced by 75% (9 of 12) of the patients. Mean improvement in Dermatology Life Quality Index (DLQI) was 42%. Five of 12 patients (42%) experienced adverse events, which were generally mild.ConclusionPatients with refractory psoriatic arthritis appeared to be responsive to adalimumab. The achievement rate of PsARC in our study was comparable to the efficacy reported in previous literature. Detection of antinuclear antibodies was not associated with the responsiveness in this trial, nor did it influence the potential for adverse effects. Adalimumab as a monotherapy is generally effective and safe.