Association Between Enthesitis and Health-related Quality of Life in Psoriatic Arthritis in Biologic-naive Patients from 2 Phase III Ustekinumab Trials.

OBJECTIVE: Evaluate enthesitis, physical function, and health-related quality of life (HRQOL) among patients with psoriatic arthritis (PsA) who are naive to anti-tumor necrosis factor agents. METHODS: In PSUMMIT 1 and 2, patients with PsA were randomized to placebo or ustekinumab 45 mg or 90 mg. Enthesitis was assessed at weeks 0 and 24 (Maastricht Ankylosing Spondylitis Enthesitis Score). Assessments included Health Assessment Questionnaire-Disability Index (HAQ-DI), Medical Outcomes Study Short Form-36 (SF-36) physical component summary/mental component summary (PCS/MCS), and American College of Rheumatology 20 (ACR20). RESULTS: At Week 24, 21 had worsened enthesitis, 158 had improved enthesitis, and 412 had unchanged enthesitis. Improved enthesitis was associated with improvements in HAQ-DI and SF-36 MCS. Results were similar for ACR20 responders and nonresponders. CONCLUSION: Improvement in enthesitis at Week 24 was associated with improvements in physical function/HRQOL regardless of ACR20 response.