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  • Title: The effectiveness and toxicity of cyclosporin A in rheumatoid arthritis: longitudinal analysis of a population-based registry.
    Author: Marra CA, Esdaile JM, Guh D, Fisher JH, Chalmers A, Anis AH.
    Journal: Arthritis Rheum; 2001 Jun; 45(3):240-5. PubMed ID: 11409664.
    Abstract:
    OBJECTIVE: To determine factors associated with response or toxicity to cyclosporin A (CSA) in a population-based inception cohort with rheumatoid arthritis (RA). METHODS: Prospectively collected longitudinal measures including tender joint count (JC), duration of morning stiffness (MS), systolic and diastolic blood pressure (SBP, DBP), and serum creatinine (SCr) were modeled using generalized estimating equations. Survival methods were used to estimate CSA continuation time and its determinants. RESULTS: Of 133 patients (75% female, median RA duration 13 years), 37 discontinued CSA because of ineffectiveness (19) or because of toxicity (18) including increased SCr in 10, hypertension in 4, infections in 3, and gingival hyperplasia in 1. Patients remained on CSA a median of 75 months (95% confidence interval [CI] 38-112). Those receiving concomitant methotrexate (MTX) were more than 4 times as likely to continue on CSA therapy (hazard ratio 0.22, 95% CI 0.10-0.94). A lower final JC was predicted by a longer CSA treatment duration (relative risk [RR] 0.99 per month, 95% CI 0.98-0.99) and concomitant MTX therapy (RR 0.79, 95% CI 0.63-0.99); decreased MS was predicted only by longer CSA treatment duration (reduction of 2.0 minutes per month, 95% CI 1.1-3.0). Each previous disease-modifying antirheumatic drug (DMARD) exposure predicted a rise in SCr (35 micromole/liter, 95% CI 22-48), SBP (7.2 mm Hg, 95% CI 2.7-11.7), and DBP (3.8 mm Hg, 95% CI 3.0-6.4). CONCLUSIONS: Combination CSA/MTX prolongs therapy and reduces JC. Long-term CSA treatment was fairly well tolerated. Previous DMARD use appears to be a determinant for the development of toxicity.
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