Patient profiles in randomised controlled trials versus a real-world study, in psoriatic arthritis: scoping review and meta-analysis.

Objective: Patients with psoriatic arthritis (PsA) in randomised controlled trials (RCTs) may not reflect patients in clinical practice. The objective was to perform a meta-analysis of PsA patients' characteristics in RCTs of biologic disease-modifying antirheumatic drugs (bDMARDs), and to compare them to patient profiles in a real-world study.

Methods: Data sources: (a) Scoping literature review of phase III RCTs of bDMARDs in PsA published 2015-2020; (b) International observational study of PsA patients starting a bDMARD enrolled in 2015-2018 (PsABio: NCT02627768). Data collected at baseline included swollen and tender joint counts (SJC/TJC), enthesitis, skin involvement (body surface area -BSA-), C-reactive protein (CRP), physician global assessment (PhGA) and patient-reported outcomes (HAQ, pain). Univariate random-effects meta-analysis was conducted to calculate pooled means and proportions.

Results: Overall, 5654 patients from 10 RCTs were compared to 930 PsABio patients. Demographic data were similar. SJC/TJC were higher in RCTs than in PsABio (pooled means, 11.8/21.5 vs 5.7/11.9 respectively); enthesitis was more frequent in RCTs (64.7% vs 48.2%); as were patients with a BSA≥3% (62.2% vs 54.0%). PhGA was higher in RCTs (59.7mm vs 54.1mm). In contrast, patient-reported outcomes were similar, while CRP was significantly higher in PsABio (1.1 vs 1.4mg/dl).

Conclusion: PsA patients starting a bDMARD in RCTs had highly active disease and a high patient-reported disease burden. In contrast, PsABio real-world patients starting a bDMARD had lower joint counts, skin disease and PhGA, but presented with similar patient-reported disease burden. The extrapolation of RCT data in clinical practice should take these elements into account.