Abstract
Objective: To analyze the efficacy of tocilizumab (TCZ) and the factors that influence achievement of Boolean-based remission in patients with rheumatoid arthritis (RA) treated with TCZ in daily clinical practice.Methods: The efficacy of TCZ at 24 weeks after initiation of TCZ in 80 patients with RA was analyzed by comparing achievement of “DAS28 remission” with that of “Boolean-based remission”. The predictive factors that influence achievement of Boolean-based remission were determined using multiple logistic regression analysis using a step-wise method.Results: DAS28 remission and Boolean-based remission were achieved in 50.0 and 12.5 % of patients, respectively. Significant differences in achieving Boolean-based remission were observed when patients were stratified by disease duration in tertiles (p < 0.05) and by physical function in tertiles (p < 0.05); no such differences were observed for achieving DAS28 remission. The least achievable component among the Boolean-based remission criteria was patient’s global assessment. The predictive factor for not achieving Boolean-based remission at 24 weeks was having a worse baseline physical function (odds ratio, 3.66; 95 % confidence interval, 1.17–14.48).Conclusions: This study suggests that baseline disability predicts a lack of achievement of Boolean-based remission. Thus, better responses to TCZ may be obtained when TCZ is initiated in RA patients before disability develops.
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