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Background/Aims Guselkumab (GUS), a human monoclonal antibody targeting the interleukin-23p19-subunit, has demonstrated efficacy at Week 24 (W24) in the Phase IIIb COSMOS clinical trial of patients with active psoriatic arthritis (PsA) and inadequate response or intolerance to one or two tumour necrosis factor inhibitors (TNFis). This post hoc analysis aimed to identify predictors of minimal disease activity (MDA) with GUS at W24 in this population. Methods Multiple logistic regression analysis was performed to identify potential predictors of MDA with GUS at W24 in TNFi-refractory patients with PsA; odds ratios, 95% confidence intervals and p-values were calculated. Baseline characteristics assessed as predictors included sex, body mass index (BMI), C-reactive protein (CRP), other medication use and disease duration; clinical features included tender and swollen joint counts (TJC/SJC), affected joint location, dactylitis, enthesitis, spondylitis, Psoriasis Area Severity Index (PASI) score and psoriasis (PsO) localisation (Table). Missing data for MDA at W24 were imputed as non-response; missing baseline values were imputed for two patients. Results Patients (n = 187; female, 54.6%; mean disease duration, 8.3 years) had mean TJC 0-68 and SJC 0-66 of 21.0 and 10.3, respectively, mean PASI score of 11.6, and mean BMI of 28.9; 67.9% had enthesitis and 35.8% had dactylitis at baseline. One prior TNFi had been received by 88.2% of patients, with two received by 11.8%. At W24, 17.1% (32/187) of patients achieved MDA. Wrist involvement (p = 0.031) and scalp PsO (p = 0.049) were positive predictors of MDA. Women were significantly less likely to achieve MDA vs. men; other negative predictors included hand small joints or shoulder involvement and hand/foot PsO (all p &amp;lt; 0.05). Age, BMI, CRP, TJC/SJC, HAQ-DI, PASI, spondylitis, enthesitis, dactylitis, other medication and number of prior TNFis were not predictive of MDA (Table). Conclusion Baseline characteristics and clinical features may be positively (wrist involvement, scalp PsO) or negatively (female sex, hand small joints or shoulder involvement, hand/foot PsO) associated with achieving MDA with GUS at W24 in a TNFi-refractory population. Though the low patient number limits the generalisability of this analysis, assessment of Week 48 data may further elucidate potential predictors of MDA after longer-term treatment. Disclosure W. Tillett: Other; William Tillett has received research grants and consulting or speaker fees from AbbVie, Amgen, Celgene, Eli Lilly, Janssen, MSD, Novartis, Pfizer and UCB. S. Ohrndorf: Other; Sarah Ohrndorf has received fees from AbbVie, BMS, Janssen, Novartis and Pfizer. J. Ramírez: Other; Julio Ramírez has received consulting or speaker fees from AbbVie, Amgen, Eli Lilly, Janssen, Novartis and UCB. M. Neuhold: Other; Marlies Neuhold is an employee of Janssen and owns stocks in Johnson &amp; Johnson. R. Wapenaar: Other; Robert Wapenaar is an employee of Janssen and owns stocks in Johnson &amp; Johnson. E. Theander: Other; Elke Theander is an employee of Janssen and owns stocks in Johnson &amp; Johnson. C. Contre: Other; Christine Contre is an employee of Janssen and owns stocks in Johnson &amp; Johnson. M. Sharaf: Other; Mohamed Sharaf is an employee of Janssen and owns stocks in Johnson &amp; Johnson. M. Shawi: Other; May Shawi is an employee of Janssen and owns stocks in Johnson &amp; Johnson. M. Vis: Other; Marijn Vis has received research grants and consulting or speaker fees from AbbVie, Amgen, Eli Lilly, Janssen, Novartis, Pfizer, UCB and the Dutch Arthritis Foundation.

rheumatology

P271 To what extent are baseline characteristics in biologic-experienced patients with psoriatic arthritis associated with achievement of minimal disease activity at week 24 of guselkumab treatment: a post hoc analysis of the phase IIIb COSMOS clinical trial