Effectiveness and safety of treat-to-target strategy in elderly-onset rheumatoid arthritis: a 3-year prospective observational study.

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To evaluate three-year outcomes of following a treat-to-target (T2T) strategy targeting low disease activity (LDA) for patients with elderly-onset rheumatoid arthritis (EORA) and to confirm safety profile of T2T.Treatment was adjusted to target LDA with conventional synthetic DMARDs, followed by biological DMARDs (bDMARDs) in 197 MTX-naïve EORA patients (mean age 74.9 years) with moderate-to-high disease activity. Non-implementation of T2T was evaluated at week 12, 24, 36, 52, 76, 104, and 128. To evaluate risks of using MTX, bDMARDs, and glucocorticoids, 2122 periods of 3 months each were analyzed using Bayesian hierarchical logistic regression models.84.7% of patients received methotrexate, 34.0% glucocorticoids with DMARDs and 41.6% bDMARDs during the observation period. Sixty-nine of the 197 patients failed to adhere to T2T because of comorbidities or the patient´s own decision: 33 failed once, 19 twice, 10 three times, and 6 four times or more. Simplified disease activity index (SDAI) remission and HAQ Disability Index (HAQ-DI) ≤0.5 at 3 years were achieved in 57.8% and 70.3% of the 128 patients adhering to T2T, and 34.8% and 43.5% of the 69 patients who did not adhere to T2T, respectively, and these were significantly different. Eighty-nine SAEs of any type were reported in 61 patients. MTX, bDMARDs, and glucocorticoid were not associated with SAEs when adjusted for mean SDAI during the observation period and comorbidities at baseline.T2T strategy for EORA by using MTX and bDMARDs was effective with acceptable safety profile. Adhering to T2T led to better outcomes.

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