Please click the links below to go to the CSF review of each paper2019 was another remarkable year in cytokine signalling. We can be optimistic that clinical practice for inflammatory arthritis will continue to improve, with promising long-term safety data supporting the use of established JAK inhibitors; tofacitinib and baricitinib, in addition to exciting phase III clinical data for filgotinib and newly approved upadacitinib. You can find the most notable papers, as selected by CSF Steering Committee Chair Professor Iain McInnes, with links to their respective detailed summaries below: Phase III Efficacy and Safety of Filgotinib for Patients With Rheumatoid Arthritis With Inadequate Response to Methotrexate: FINCH 1 Primary Outcome Results EULAR Abstract Presentation Combe BG, Kivitiz AJ, Tanaka Y, et al. Efficacy and Safety of Filgotinib for Patients With Rheumatoid Arthritis Naïve to Methotrexate Therapy: FINCH 3 Primary Outcome Results EULAR Abstract Presentation Westhovens R, Rigby WFC, van der Heijde D et al. Upadacitinib as Monotherapy in Patients with Active Rheumatoid Arthritis and Inadequate Response to Methotrexate (SELECT-MONOTHERAPY): A Randomised, Placebo-Controlled, Double-Blind Phase 3 Study LancetSmolen JS, Pangan AL, Emery P, et al. Efficacy and Safety of Peficitinib (ASP015K) in Patients with Rheumatoid Arthritis and an Inadequate Response to Methotrexate: Results of a Phase III Randomised, Double-Blind, Placebo-Controlled Trial (RAJ4) in JapanAnnals of Rheumatic Diseases Takeuchi T, Tanaka Y, Tanaka S, et al. Long Term Safety: Tofacitinib in Combination with Methotrexate in Patients with Rheumatoid Arthritis: Clinical Efficacy, Radiographic and Safety Outcomes from the 24-Month Phase 3 ORAL Scan Study Arthritis & Rheumatologyvan der Heijde D, Strand V, Tanaka Y, et al. Changes in Lipid Levels and Incidence of Cardiovascular Events Following Tofacitinib Treatment in Patients with Psoriatic Arthritis: A Pooled Analysis Across Phase 3 and Long-Term Extension Studies Arthritis Care & ResearchGladman D, Charles-Schoeman C, McInnes IB, et al. Efficacy and Safety Data Based on Historical or Pre-Existing Conditions at Baseline for Patients with Active Rheumatoid Arthritis Who Were Treated with Baricitinib Annals of Rheumatic DiseasesCombe B, Balsa A, Sarzi-Puttini P, et al.Switching: Clinical Outcomes in Patients Switched from Adalimumab to Baricitinib Due to Non-Response and/or Study Design: Phase III Data in Patients with Rheumatoid Arthritis Annals of Rheumatic Diseases Tanaka Y, Fautrel B, Keystone EC, et al. Safety and Effectiveness of Upadacitinib or Adalimumab Plus Methotrexate in Patients with Rheumatoid Arthritis Over 48 Weeks with Switch to Alternate Therapy in Patients with Insufficient Response Annals of Rheumatic Diseases Fleischmann RM, Genovese MC, Enejosa JV, et al.Pre-clinical: Comparison of Baricitinib, Upadacitinib, and Tofacitinib Mediated Regulation of Cytokine Signalling in Human Leukocyte Subpopulations Arthritis Research and Therapy McInnes IB, Byers NL, Higgs RE, et al.