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Systemic juvenile idiopathic arthritis (sJIA) and adult-onset Still's disease (AOSD) are considered the same disease, but a common approach for diagnosis and management is still missing., Methods: In May 2022, EULAR and PReS endorsed a proposal for a joint task force (TF) to develop recommendations for the diagnosis and management of sJIA and AOSD. The TF agreed during a first meeting to address four topics: similarity between sJIA and AOSD, diagnostic biomarkers, therapeutic targets and strategies and complications including macrophage activation syndrome (MAS). Systematic literature reviews were conducted accordingly., Results: The TF based their recommendations on four overarching principles, highlighting notably that sJIA and AOSD are one disease, to be designated by one name, Still's disease.Fourteen specific recommendations were issued. Two therapeutic targets were defined: clinically inactive disease (CID) and remission, that is, CID maintained for at least 6 months. The optimal therapeutic strategy relies on early use of interleukin (IL-1 or IL-6 inhibitors associated to short duration glucocorticoid (GC). MAS treatment should rely on high-dose GCs, IL-1 inhibitors, ciclosporin and interferon-γ inhibitors. A specific concern rose recently with cases of severe lung disease in children with Still's disease, for which T cell directed immunosuppressant are suggested. The recommendations emphasised the key role of expert centres for difficult-to-treat patients. All overarching principles and recommendations were agreed by over 80% of the TF experts with a high level of agreement., Conclusion: These recommendations are the first consensus for the diagnosis and management of children and adults with Still's disease., Competing Interests: Competing interests: BF: AbbVie, Amgen, Biogen, BMS, Celltrion, Fresenius Kabi, Galapagos, Gilead, Janssen, Lilly, Medac, MSD, Nordic Pharma, Novartis, Pfizer, Roche-Chugai, Sandoz, Sanofi-Genzyme, SOBI, UCB, Viatris; SM: BMS, Lilly, SOBI; JA: Sobi, Novartis, Roche, Pfizer, AbbVie, Lilly; AB: Boehringer Ingelheim, Novartis, AbbVie, Fresenius Kabi, GlaxoSmithKline; CB: SOBI; TC: AbbVie, Novartis, Roche; LD: AbbVie, Amgen, Astra-Zeneca, Boehringer-Ingelheim, BMS, Lilly, Galapagos, GlaxoSmithKline, Janssen, Kiniksa, Novartis, Pfizer, SOBI; ADB: Lenovo; EF: AbbVie, BMS, Galapagos, Lilly, Medac, Novartis, Sanofi, UCB, Pfizer, Roche, SOBI; DF: Boehringer-Ingelheim, SOBI, Novartis, Werfen Innova; MG, SGL, FM, FOR, SV: Novartis, SOBI; RG, AG: Novartis; IJ: Amgen, Lilly, Novartis, SOBI; PN: BMS, Brickell Bio, Cerecor, Exo Therapeutics, Miach Ortho, Novartis, Pfizer, SOBI, UpToDate, American Academy of Pediatrics; SO: Novartis, SOBI, Pfizer; PQ: Amgen, AbbVie, BMS, Roche-Chugai, Lilly, Novartis, Pfizer, Sanofi, SOBI, Health Events; PR: AbbVie, BMS, Janssen, Novartis, SOBI; SS: Novartis, SOBI, CSL Behring, Takeda, BioCryst, Biotest; M-ET: Boehringer-Ingelheim, Pfizer, Lilly, MSD, SOBI, Janssen, BMS, Fresenius Kabi, Galapagos, AbbVie; CW: Novartis, SOBI, UCB; LC: Meda Pharma, Angelini Pharma, Pfizer, SANOFI-AVENTIS, Fresenius Kabi, Galapagos; FDB: SOBI, Novartis, Apollo, Kiniksa, Sanofi, Roche, Elixiron, Regeneron; ADM, SB, KL, CL, ES, T-CW: none., (© European Alliance of Associations for Rheumatology, EULAR 2024. Re-use permitted under CC BY-NC-ND. No commercial re-use. No derivatives. See rights and permissions. Published by BMJ on behalf of EULAR.)

Introduction: Although patient-reported outcome measures (PROMs) are increasingly used in clinical practice and research, it is unclear whether these instruments cover the perspective of young people with inflammatory arthritis (IA). The aims of this study were to explore whether PROMs commonly used in IA adequately cover the perspective of young people from different European countries., Methods: A multinational qualitative study was conducted in Austria, Croatia, Italy and the Netherlands. Young people with either rheumatoid arthritis (RA), juvenile idiopathic arthritis (JIA), Still's disease, psoriatic arthritis (PsA) or spondyloarthritis (SpA), aged 18-35 years, participated in semistructured focus group interviews. Thematic analysis was used and data saturation was defined as no new emergent concepts in at least three subsequent focus groups., Results: Fifty-three patients (21 with RA/JIA/Still's, 17 with PsA, 15 with SpA; 72% women) participated in 12 focus groups. Participants expressed a general positive attitude towards PROMs and emphasised their importance in clinical practice. In addition, 48 lower level concepts were extracted and summarised into 6 higher level concepts describing potential issues for improvement. These included: need for lay-term information regarding the purpose of using PROMs; updates of certain outdated items and using digital technology for data acquisition. Some participants admitted their tendency to rate pain, fatigue or disease activity differently from what they actually felt for various reasons., Conclusions: Despite their general positive attitude, young people with IA suggested areas for PROM development to ensure that important concepts are included, making PROMs relevant over the entire course of a chronic disease., Competing Interests: Competing interests: PS reports grants from AbbVie, outside the submitted work; IP reports personal fees from Abbvie, personal fees from Novartis, personal fees from Roche, personal fees from Sandoz, personal fees from Sanofi, outside the submitted work; SR reports personal fees from AbbVie, personal fees from Eli Lilly, personal fees from MSD, personal fees from Novartis, personal fees from Sanofi, personal fees from UCB, outside the submitted work; LG reports grants and personal fees from Amgen, grants from Galapagos, grants and personal fees from Janssen, grants and personal fees from Lilly, grants and personal fees from Pfizer, grants from Sandoz, grants from Sanofi, personal fees from AbbVie, personal fees from BMS, personal fees from Biogen, personal fees from Celgene, personal fees from Gilead, personal fees from Novartis, personal fees from Samsung Bioepis, personal fees from Sanofi-Aventis, personal fees from UCB, outside the submitted work; EN reports personal fees from Abbvie, personal fees from Celltrion, personal fees from Gilead, personal fees from Lilly, personal fees from Pfizer, personal fees from Sanofi, outside the submitted work; SS reports personal fees from Actelion, personal fees from CISCRP, personal fees from Janssen, personal fees from Parexel, outside the submitted work; TAS reports grants from AbbVie, grants and personal fees from Roche, personal fees from Sanofi Genzyme, personal fees from Takeda, outside the submitted work., (© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)