Characteristics and risk factors of relapses in patients with adult-onset still's disease: a long-term cohort study.

OBJECTIVES To describe the detailed characteristics and explore the potential risk factors of relapses in patients with adult-onset Still's disease (AOSD). METHODS We enrolled patients with AOSD admitted to the Department of Rheumatology and Immunology, Ruijin Hospital from August 2016 to September 2019. The Kaplan-Meier curves and log rank test were used to estimate the cumulative relapse probability and persistent remission rate before the first occurrence of relapse. The multivariate Cox proportional hazard method was utilized to identify risk factors associated with relapses of AOSD. RESULTS A total of 122 patients with AOSD were enrolled with a median follow-up of 12.6 months. Among them, 26 (21.3%) patients had at least one relapse. The cumulative relapse rates of AOSD patients were 14.42%, 21.79%, 24.81% and 28.57% at 6, 12, 18, 36 months, respectively. According to the multivariate analysis, intensive treatment group (OR: 6.848; 95%CI: 2.441-19.211) and macrophage activation syndrome (OR: 4.020, 95%CI: 1.564-10.322) were associated with increased risk of relapse. CONCLUSION Our study indicated that relapses occurred in at least one fifth of patients with AOSD, and patients with high disease severity at initial attack may have an increased risk of relapse, which need more intensive therapy and close follow-up.