OBJECTIVE: To investigate the initial response to treatment and risk of radiographic disease progression in current smokers (S), ex-smokers (EX), and nonsmokers (NS) in a prospective early arthritis cohort and to analyze the influence of smoking cessation on arthritis outcome. METHODS: The ESPOIR cohort is a prospective cohort study monitoring clinical, biologic, and radiographic data for patients with inflammatory arthritis lasting 6 weeks to 6 months. We examined the influence of smoking status on disease presentation (baseline characteristics) and therapeutic response at 1 year. Risk of structural progression at 12 months, defined as change in the modified Sharp/van der Heijde score ≥1, was analyzed by multivariate regression adjusted for potential confounders (age, sex, joint erosion at inclusion, educational level, positivity for rheumatoid factor or anti-cyclic citrullinated peptide 2 antibodies, and shared HLA-DRB1 epitope). RESULTS: A total of 813 patients were included; 641 (79%) fulfilled the 2010 American College of Rheumatology/European League Against Rheumatism (EULAR) criteria for rheumatoid arthritis (RA). At inclusion, 138 (21.5%) were S patients, 168 (26.2%) were EX patients, and 335 (52.3%) were NS patients. Baseline acute-phase indicator values were significantly lower for S patients than EX and NS patients (mean ± SD erythrocyte sedimentation rate was 24.2 ± 18.2 mm/hour versus 33.4 ± 28.0 and 31.4 ± 25.0 [P = 0.02], respectively, and mean ± SD C-reactive protein level was 17.7 ± 28.0 mg/dl versus 28.5 ± 42.5 and 21.4 ± 29.0 [P = 0.01], respectively). Smoking status had no influence on Disease Activity Score in 28 joints, Health Assessment Questionnaire score, EULAR response, or use of disease-modifying antirheumatic drugs and biologic therapy in the first 12 months of followup (P > 0.05). The adjusted risk for structural disease progression was associated with active smokers (odds ratio 0.50 [95% confidence interval 0.27-0.93], P = 0.028). Sixteen patients had stopped smoking at 12 months, with no significant difference in observed outcomes from other patients. CONCLUSION: In this large prospective cohort of patients with early arthritis, smoking status had no significant effect on disease activity and disability but did reduce 1-year radiographic disease progression. The antiinflammatory role of nicotine may explain the lower systemic inflammation and structural disease progression in current smokers with early RA.
OBJECTIVE: To investigate the initial response to treatment and risk of radiographic disease progression in current smokers (S), ex-smokers (EX), and nonsmokers (NS) in a prospective early arthritis cohort and to analyze the influence of smoking cessation on arthritis outcome. METHODS: The ESPOIR cohort is a prospective cohort study monitoring clinical, biologic, and radiographic data for patients with inflammatory arthritis lasting 6 weeks to 6 months. We examined the influence of smoking status on disease presentation (baseline characteristics) and therapeutic response at 1 year. Risk of structural progression at 12 months, defined as change in the modified Sharp/van der Heijde score ≥1, was analyzed by multivariate regression adjusted for potential confounders (age, sex, joint erosion at inclusion, educational level, positivity for rheumatoid factor or anti-cyclic citrullinated peptide 2 antibodies, and shared HLA-DRB1 epitope). RESULTS: A total of 813 patients were included; 641 (79%) fulfilled the 2010 American College of Rheumatology/European League Against Rheumatism (EULAR) criteria for rheumatoid arthritis (RA). At inclusion, 138 (21.5%) were S patients, 168 (26.2%) were EX patients, and 335 (52.3%) were NSpatients. Baseline acute-phase indicator values were significantly lower for S patients than EX and NSpatients (mean ± SD erythrocyte sedimentation rate was 24.2 ± 18.2 mm/hour versus 33.4 ± 28.0 and 31.4 ± 25.0 [P = 0.02], respectively, and mean ± SD C-reactive protein level was 17.7 ± 28.0 mg/dl versus 28.5 ± 42.5 and 21.4 ± 29.0 [P = 0.01], respectively). Smoking status had no influence on Disease Activity Score in 28 joints, Health Assessment Questionnaire score, EULAR response, or use of disease-modifying antirheumatic drugs and biologic therapy in the first 12 months of followup (P > 0.05). The adjusted risk for structural disease progression was associated with active smokers (odds ratio 0.50 [95% confidence interval 0.27-0.93], P = 0.028). Sixteen patients had stopped smoking at 12 months, with no significant difference in observed outcomes from other patients. CONCLUSION: In this large prospective cohort of patients with early arthritis, smoking status had no significant effect on disease activity and disability but did reduce 1-year radiographic disease progression. The antiinflammatory role of nicotine may explain the lower systemic inflammation and structural disease progression in current smokers with early RA.
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