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Objective To investigate the longitudinal association between radiographic sacroiliitis progression and treatment with tumor necrosis factor inhibitors (TNFi) in patients with early axial spondyloarthritis (SpA) in a long-term inception cohort. Methods We included patients from the German Spondyloarthritis Inception Cohort who underwent radiographic assessment of the sacroiliac joints at baseline and at least once more during the 10-year follow-up. Two central readers scored the radiographs according to the modified New York criteria for ankylosing spondylitis. The sacroiliac sum score was calculated as a mean of the scores determined by both readers. TNFi use was assessed according to exposure in the current and/or previous 2-year radiographic interval. The association between TNFi use and radiographic sacroiliitis progression was examined by longitudinal generalized estimating equation analysis with adjustment for potential confounders. Results In this long-term inception cohort, 10-year follow-up data on 737 radiographic intervals assessed in 301 patients with axial SpA (166 patients with nonradiographic axial SpA and 135 patients with radiographic axial SpA) were obtained. Having received >= 12 months of treatment with TNFi in the previous 2-year radiographic interval was associated with a significant decrease in the sacroiliitis sum score (beta = -0.09 [95% confidence interval (95% CI) -0.18, -0.003]; analyses adjusted for age, sex, symptom duration, HLA-B27 status, Bath Ankylosing Spondylitis Disease Activity Index score, C-reactive protein, and nonsteroidal antiinflammatory drug intake). In contrast, among patients receiving TNFi in the current radiographic interval, there was no significant association with change in the sacroiliitis sum score (beta = 0.05 [95% CI -0.05, 0.14]). This effect of having received >= 12 months of treatment with TNFi in the previous 2-year radiographic interval was stronger in patients with nonradiographic axial SpA as compared to patients with radiographic axial SpA (beta = -0.16 [95% CI -0.28, -0.03] versus beta = -0.04 [95% CI -0.15, 0.07]). Conclusion Treatment with TNFi was associated with the reduction in radiographic sacroiliitis progression in patients with axial SpA. This effect became evident between 2 and 4 years after treatment was initiated.

BackgroundPatients (pts) with axial spondyloarthritis (axSpA) are classified into radiographic axSpA (r-axSpA) and non-radiographic axSpA (nr-axSpA) based on the presence or absence of radiographic sacroiliitis. Approximately 20% to 80% of newly diagnosed axSpA pts have nr-axSpA and 8% to 40% progress to r-axSpA over the next 2 to 10 years.ObjectivesTo evaluate progression from nr-axSpA to r-axSpA over 5 years in a prospective multicentre cohort.MethodsPROOF was a global, real-world, prospective, observational study conducted in rheumatology clinical practices in 29 countries across 6 different geographic regions.1 The study enrolled adults with chronic back pain for ≥3 months and onset before 45 years of age. This analysis included pts diagnosed with axSpA who also fulfilled the Assessment of SpondyloArthritis international Society (ASAS) classification criteria for axSpA. Study visits occurred at baseline (BL) and yearly thereafter. Baseline and follow-up radiographs of sacroiliac joints (SIJ) were evaluated for pts with initial nr-axSpA diagnosis independently by 2 central readers according to the modified New York criteria. In the case of disagreement on the classification (nr- or r-axSpA), images were adjudicated by a third reader. Radiographic progression from nr-axSpA to r-axSpA over 5 years was evaluated by Kaplan-Meier analysis. Cox proportional hazards regression analyses for time to radiographic progression from nr-axSpA to r-axSpA were conducted. For model 1, ‘imaging arm vs clinical arm’ was used as an independent variable, and for model 2, ‘active inflammation on magnetic resonance imaging highly suggestive of sacroiliitis associated with SpA’ was used. Further, potential predictive factors included in the models were age, gender, back pain duration, number of SpA parameters, smoking status, CRP, good response to NSAIDs, HLA-B27 status, and current use of NSAIDs and TNF inhibitors.ResultsAmong 2633 enrolled pts, 2165 (82%) were diagnosed with axSpA and fulfilled the ASAS classification criteria. Among these, 1612 (74%) were classified as having r-axSpA (1050 [65%]) or nr-axSpA (562 [35%]) by central reading. The majority of nr-axSpA pts (77%) fulfilled the ASAS classification criteria due to positive findings on imaging (plus ≥1 SpA feature) and 23% were classified according to the clinical arm. A total of 246 nr-axSpA pts who had ≥1 follow-up SIJ radiograph were included in this analysis. Among these 246 pts, progression from initial nr-axSpA to r-axSpA at any of the follow-up visits was observed in 40 pts (16%) over 5 years. Mean time to radiographic progression was 2.4 years (ranging from 0.9 to 5.1 years) in descriptive analysis (Kaplan-Meier curve shown in Figure 1). In model 1 of the Cox regression analysis, male gender (hazard ratio [HR]: 3.16 [95% CI: 1.22–8.17]; P=0.0174), fulfilment of the imaging arm (HR: 6.64 [1.37–32.25]; P=0.0188), and good response to NSAIDs, (HR: 4.66 [1.23–17.71]; P=0.0237), were significantly associated with progression to r-axSpA (Figure 1). In model 2, HLA-B27 positivity showed a significant association with progression (HR: 3.99 [1.10–14.49]; P=0.0353; Figure 1).ConclusionIn this study, 16% of nr-axSpA pts progressed to r-axSpA within 5 years. The mean time to disease progression was 2.4 years. Predictors of radiographic progression were male gender, good response to NSAIDs, and fulfilment of the imaging arm as well as HLA-B27 positivity.References[1]Poddubnyy D. et al, Rheumatology (Oxford). 2021; doi: 10.1093/rheumatology/keab901Disclosure of InterestsDenis Poddubnyy Speakers bureau: AbbVie, Bristol Myers Squibb, Eli Lilly, MSD, Novartis, Pfizer, and UCB, Consultant of: AbbVie, Biocad, Eli Lilly, Gilead, GlaxoSmithKline, MSD, Novartis, Pfizer, Samsung Bioepis, and UCB, Grant/research support from: AbbVie, Eli Lilly, MSD, Novartis, and Pfizer, Joachim Sieper Speakers bureau: AbbVie, Janssen, Merck, Novartis, Pfizer, Roche, and UCB, Consultant of: AbbVie, Janssen, Lilly, Merck, Novartis, Pfizer, and UCB, Servet Akar Speakers bureau: AbbVie, Lilly, MSD, Novartis, Pfizer, Roche, Janssen, and UCB, Consultant of: AbbVie, Lilly, MSD, Novartis, Pfizer, Roche, Janssen, and UCB, Grant/research support from: AbbVie, Lilly, MSD, Novartis, Pfizer, Roche, Janssen, and UCB, Santiago Muñoz-Fernández Speakers bureau: AbbVie, BMS, Galapagos, Janssen, MSD, Novartis, Pfizer, Roche, and UCB., Consultant of: AbbVie, BMS, Galapagos, Janssen, MSD, Novartis, Pfizer, Roche, and UCB., Grant/research support from: AbbVie, BMS, Galapagos, Janssen, MSD, Novartis, Pfizer, Roche, and UCB, Hildrun Haibel Speakers bureau: AbbVie, Janssen, MSD, Pfizer, Sobi, Novartis, and Roche, Consultant of: Boehringer, Janssen, MSD, Novartis, and Roche, Torsten Diekhoff Paid instructor for: Novartis, MSD, Canon MS, Consultant of: Eli Lilly, Mikhail Protopopov: None declared, Elisabeth Altmaier Consultant of: AbbVie, Fabiana Ganz Shareholder of: Owns AbbVie stock or stock options., Employee of: AbbVie, Robert Inman Consultant of: AbbVie, Amgen, Janssen, Lilly, Novartis, Pfizer, and Sandoz, Grant/research support from: AbbVie, Amgen, and Janssen

Objective To identify clusters of peripheral involvement according to the specific location of peripheral manifestations (ie, arthritis, enthesitis and dactylitis) in patients with spondyloarthritis (SpA) including psoriatic arthritis (PsA), and to evaluate whether these clusters correspond with the clinical diagnosis of a rheumatologist. Methods Cross-sectional study with 24 participating countries. Consecutive patients diagnosed by their rheumatologist as PsA, axial SpA or peripheral SpA were enrolled. Four different cluster analyses were conducted: one using information on the specific location from all the peripheral manifestations, and a cluster analysis for each peripheral manifestation, separately. Multiple correspondence analyses and k-means clustering methods were used. Distribution of peripheral manifestations and clinical characteristics were compared across the different clusters. Results The different cluster analyses performed in the 4465 patients clearly distinguished a predominantly axial phenotype (cluster 1) and a predominantly peripheral phenotype (cluster 2). In the predominantly axial phenotype, hip involvement and lower limb large joint arthritis, heel enthesitis and lack of dactylitis were more prevalent. In the predominantly peripheral phenotype, different subgroups were distinguished based on the type and location of peripheral involvement: a predominantly involvement of upper versus lower limbs joints, a predominantly axial enthesitis versus peripheral enthesitis, and predominantly finger versus toe involvement in dactylitis. A poor agreement between the clusters and the rheumatologist € s diagnosis as well as with the classification criteria was found. Conclusion These results suggest the presence of two main phenotypes (predominantly axial and predominantly peripheral) based on the presence and location of the peripheral manifestations. publishersversion published

Objectives: To characterise peripheral musculoskeletal involvement in patients with spondyloarthritis (SpA) including psoriatic arthritis (PsA), across the world. Methods: Cross-sectional study with 24 participating countries. Patients with a diagnosis of axial SpA (axSpA), peripheral SpA (pSpA) or PsA according to their rheumatologist were included. The investigators were asked which diagnosis out of a list of six (axSpA, PsA, pSpA, inflammatory bowel disease-associated SpA, reactive arthritis or juvenile SpA (Juv-SpA)) fitted the patient best. Peripheral manifestations (ie, peripheral joint disease, enthesitis, dactylitis and root joint disease), their localisation and treatments were evaluated. Results: A total of 4465 patients were included (61% men, mean age 44.5 years) from four geographic areas: Latin America (n=538), Europe plus North America (n=1677), Asia (n=975) and the Middle East plus North Africa (n=1275). Of those, 78% had ever suffered from at least one peripheral musculoskeletal manifestation; 57% had peripheral joint disease, 44% had enthesitis and 15% had dactylitis. Latin American had far more often peripheral joint disease (80%) than patients from other areas. Patients with PsA had predominantly upper limb and small joint involvement (52%). Hip and shoulder involvement was found in 34% of patients. The prevalence of enthesitis ranged between 41% in patients with axSpA and 65% in patients with Juv-SpA. Dactylitis was most frequent among patients with PsA (37%). Conclusion: These results suggest that all peripheral features can be found in all subtypes of SpA, and that differences are quantitative rather than qualitative. In a high proportion of patients, axial and peripheral manifestations coincided. These findings reconfirm SpA clinical subtypes are descendants of the same underlying disease, called SpA. publishersversion published

Additional file 1: Detailed description of the monitoring process in RABBIT-SpA.

Supplemental material, sj-docx-1-tab-10.1177_1759720X211057975 for Axial Involvement in Psoriatic Arthritis cohort (AXIS): the protocol of a joint project of the Assessment of SpondyloArthritis international Society (ASAS) and the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) by Denis Poddubnyy, Xenofon Baraliakos, Filip Van den Bosch, J��rgen Braun, Laura C. Coates, Vinod Chandran, Torsten Diekhoff, Floris A. van Gaalen, Lianne S. Gensler, Niti Goel, Alice B. Gottlieb, D��sir��e van der Heijde, Philip S. Helliwell, Kay Geert A. Hermann, Deepak Jadon, Robert G. Lambert, Walter P. Maksymowych, Philip Mease, Peter Nash, Fabian Proft, Mikhail Protopopov, Joachim Sieper, Murat Torgutalp and Dafna D. Gladman in Therapeutic Advances in Musculoskeletal Disease

Supplemental material, sj-docx-2-tab-10.1177_1759720X211057975 for Axial Involvement in Psoriatic Arthritis cohort (AXIS): the protocol of a joint project of the Assessment of SpondyloArthritis international Society (ASAS) and the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) by Denis Poddubnyy, Xenofon Baraliakos, Filip Van den Bosch, J��rgen Braun, Laura C. Coates, Vinod Chandran, Torsten Diekhoff, Floris A. van Gaalen, Lianne S. Gensler, Niti Goel, Alice B. Gottlieb, D��sir��e van der Heijde, Philip S. Helliwell, Kay Geert A. Hermann, Deepak Jadon, Robert G. Lambert, Walter P. Maksymowych, Philip Mease, Peter Nash, Fabian Proft, Mikhail Protopopov, Joachim Sieper, Murat Torgutalp and Dafna D. Gladman in Therapeutic Advances in Musculoskeletal Disease

Supplemental material, sj-docx-1-tab-10.1177_1759720X20987700 for Sustained clinical response and safety of etanercept in patients with early axial spondyloarthritis: 10-year results of the ESTHER trial by Fabian Proft, Anja Weiß, Murat Torgutalp, Mikhail Protopopov, Valeria Rios Rodriguez, Hildrun Haibel, Olaf Behmer, Joachim Sieper and Denis Poddubnyy in Therapeutic Advances in Musculoskeletal Disease