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  • Title: Current smoking status is a strong predictor of radiographic progression in early rheumatoid arthritis: results from the SWEFOT trial.
    Author: Saevarsdottir S, Rezaei H, Geborek P, Petersson I, Ernestam S, Albertsson K, Forslind K, van Vollenhoven RF, SWEFOT study group.
    Journal: Ann Rheum Dis; 2015 Aug; 74(8):1509-14. PubMed ID: 24706006.
    Abstract:
    OBJECTIVES: To study clinical predictors for radiographic progression after 1 year in an early rheumatoid arthritis (RA) trial. METHODS: In the SWEFOT trial population, disease modifying antirheumatic drug (DMARD) naïve RA patients started methotrexate; 3-month responders (DAS28 <3.2) continued (n=147), while non-responders were randomised to addition of sulfasalazine+hydroxychloroquine (n=130) or infliximab (n=128). X-rays were scored by the Sharp-van der Hejde score (SHS) method and radiographic progression was defined as a ≥5 increase after 1 year. Potential baseline predictors of radiographic progression were tested using multivariable logistic regression, adjusted for potential confounders. RESULTS: 79 of 311 patients with available radiographs at baseline and follow-up had radiographic progression. The following baseline parameters were independent predictors of radiographic progression at 1 year: baseline erosions (adjusted OR=2.29, 95% CI 1.24 to 4.24), erythrocyte sedimentation rate (adjusted OR per tertile increase=1.72, 95% CI 1.12 to 2.65) and C-reactive protein (adjusted OR per tertile increase=1.52, 95% CI 1.03 to 2.26). Current smoking was an independent predictor of radiographic progression (adjusted OR=2.17, 95% CI 1.06 to 4.45). These results remained after further adjustment for treatment strategy. Three-dimensional matrix including current smoking status, erosions and C-reactive protein tertiles showed a 12-63% risk gradient from patients carrying none compared with all predictors. Rheumatoid factor (RF)/anti-cyclic citrullinated peptide (anti-CCP) positivity did not significantly predict radiographic progression using SHS increase ≥5 as cut-off. In a secondary exploratory analysis using cut-off >1, both RF and anti-CCP positivity were significant predictors in the unadjusted, but not the adjusted analyses. The other parameters also remained significant using this lower cut-off. CONCLUSIONS: In addition to previously described predictors, we identified smoking as a strong independent risk factor for radiographic progression in early RA. TRIAL REGISTRATION NUMBER: NCT00764725.
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