Incidence of Psoriatic Arthritis Up With More Severe Psoriasis

Progression to psoriatic arthritis (PsA) is common among patients with psoriasis, with increased incidence observed among those with more severe disease, according to a study published in the Journal of the American Academy of Dermatology. Researchers found that PsA incidence was 2.9 events per 100 patient-years overall during the year following psoriasis diagnosis. For mild, moderate, and severe psoriasis, as determined by receiving nonsystemics, non biologic systemic therapy, and biologics, the incidence was 2.1, 9.9, and 17.6 events per 100 patient-years, respectively. Overall incidence was lower when excluding patients diagnosed with PsA 1 year after psoriasis diagnosis (1.7 events per 100 patient-years), with similar trends noted for treatment-severity surrogates.