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Background/Aims Power Doppler ultrasound (PDUS) is a sensitive non-invasive imaging tool to visualize a wide range of articular and periarticular inflammation in psoriatic arthritis (PsA). ULTIMATE (NCT02662985) is the first large RCT that used ultrasound with Global OMERACT ultrasound synovitis score (GLOESS) as the primary endpoint, to demonstrate early benefits of secukinumab on synovitis in patients with PsA through 12 weeks. Here we report the responsiveness of ultrasound on synovitis and enthesitis, clinical efficacy, and safety of secukinumab up to 52 weeks. Methods This was a 52-week study with 12-week double-blind placebo-controlled treatment followed by 12-week open-label treatment and 6-month open-label extension treatment in all patients. Synovitis and ultrasound enthesitis response were measured by GLOESS and Global OMERACT enthesitis score (definitions 1 and 2) at patient level, respectively. Other assessments across key PsA manifestations of joints (ACR responses), enthesitis, (SPARCC), skin (PASI responses), dactylitis (LDI) and physical function (HAQ-DI) were also evaluated. Data are presented as observed. Results A total of 166 patients were enrolled, of which 90% (75/83) of secukinumab and 83% (69/83) of placebo-secukinumab participants completed 52 weeks. A continued improvement in GLOESS was observed in both secukinumab and placebo-secukinumab groups after switching to active therapy at Week 12 through Week 52 and a similar trend of improvement in Global OMERACT enthesitis score (definition 1 and 2) was observed up to 52 weeks in both groups (Table). At 52 weeks, sustained clinical response rates were observed in secukinumab (ACR20, 89%; ACR50, 68%; ACR70, 48%; PASI 90, 59%; PASI 100, 55%) and placebo-secukinumab groups (ACR20, 84%; ACR50, 72%; ACR70, 47%; PASI 90, 74%; PASI 100, 48%). Mean changes from baseline at Week 52 in HAQ-DI and SPARCC were -3.0 and -0.8 and -3.6 and -0.7 for secukinumab and placebo-secukinumab, respectively. There were no new or unexpected safety findings. Conclusion ULTIMATE demonstrated the responsiveness of ultrasound on both synovitis and enthesitis outcomes in PsA supporting its use in clinical trials, and confirmed the rapid and continued benefits of secukinumab through 52 weeks. Sustained efficacy was also observed across key clinical PsA manifestations with a safety profile consistent with previous reports. Disclosure P.G. Conaghan: Consultancies; AbbVie, AstraZeneca, BMS, Eli Lilly, Galapagos, Gilead, Novartis, Pfizer. Member of speakers’ bureau; AbbVie, AstraZeneca, BMS, Eli Lilly, Galapagos, Gilead, Novartis, Pfizer. M.A. D’Agostino: Consultancies; Sanofi, Novartis, BMS, Janssen, Celgene, Roche, AbbVie, UCB, Eli Lilly. Member of speakers’ bureau; Sanofi, Novartis, BMS, Janssen, Celgene, Roche, AbbVie, UCB, Eli Lilly. G. Schett: Member of speakers’ bureau; AbbVie, BMS, Celgene, Janssen, Eli Lilly, Novartis, Roche, UCB. C. Guerrero: None. P. Hanova: None. T. Cazenave: None. M.S. Stoenoiu: Honoraria; Roche, AbbVie, BMS, Gilead, Jonsson, MSD, Novartis, Pfizer, UCB. Member of speakers’ bureau; Roche, AbbVie, UCB. Grants/research support; Roche, AbbVie, UCB. M. Backhaus: Honoraria; Roche, AbbVie, BMS, Gilead, Jonsson, MSD, Novartis, Pfizer, UCB. Member of speakers’ bureau; Roche, AbbVie, UCB. Grants/research support; Roche, AbbVie, UCB. G. Mouterde: Consultancies; AbbVie, Lilly. Honoraria; AbbVie, BMS, Lilly, Novartis, Pfizer, Roche, Chugai, UCB. Grants/research support; Celgene, Pfizer. M. Boers: Consultancies; BMS, Novartis, Pfizer, GSK. A. Duggan: Other; Employee of Novartis. P. Goyanka: Other; Employee of Novartis MSD. C. Gaillez: Shareholder/stock ownership; Novartis, BMS. Other; Employee of Novartis.

rheumatology

P253 Ultrasound demonstrates continued improvement in psoriatic arthritis synovitis and enthesitis with secukinumab: 52-week results from a Phase 3 study