Abstract
OBJECTIVE: While sustained remission is the treatment goal for rheumatoid arthritis (RA), its long-term remission remains challenging. This real-world study aimed to assess the role of clinical deep remission (CliDR) in sustained remission and the risk of relapse, as well as its interaction with drug tapering. METHODS: Of the 541 patients enrolled in the cohort, 145 who achieved a Disease Activity Score in 28 joints using C reactive protein (CRP) remission with 5 years of follow-up after remission were included in this study. Participants were stratified by CliDR status (defined as no tender/swollen joints with normal CRP/erythrocyte sedimentation rate). Kaplan-Meier analysis was used to compare sustained remission rates. Multivariable Cox regression with time-dependent covariates was performed to identify independent predictors and to assess the interaction between CliDR and drug tapering. RESULTS: The sustained remission rate declined over time but was significantly higher in the CliDR group (62.5%; 95% CI 45.3% to 77.1%) than the non-CliDR group (38.1%; 95% CI 29.6% to 47.3%) at 5 years (p=0.014). In the non-CliDR group, tapering was associated with an 8.47-fold increase in the hazard of relapse (HR=8.47, 95% CI 5.01 to 14.32, p<0.001). The interaction between group and tapering was statistically significant (HR=0.26, 95% CI 0.07 to 0.98, p=0.046), indicating that the effect of tapering on relapse risk was significantly attenuated in the CliDR group compared with the non-CliDR group. CONCLUSIONS: Our findings suggest that achieving CliDR is associated with significantly higher sustained remission rates in RA and that the safety of treatment tapering is contingent on prior achievement of CliDR.