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Smoking cigarettes is a predictor of RA and may negatively impact on efficacy of anti-TNFs
Date:6/17/2010

Rome, Italy, Thursday 17 June 2010: Smoking cigarettes is a significant risk factor for developing rheumatoid arthritis (RA) and may have a negative impact on the effectiveness of anti-tumour necrosis factor (anti-TNF) inhibitors in RA patients taking these treatments, according to results of two studies presented today at EULAR 2010, the Annual Congress of the European League Against Rheumatism in Rome, Italy. A further study has shown that smoking interferes with the expression of several genes which, when over-expressed can contribute to processes which exacerbate disease activity.

Results of a Swedish study1 showed that for both men and women, smoking at the time of study initiation was shown to be a predictor for future diagnosis with RA (Odds Ratio (OR) 1.55 95% CI 1.20-2.01). Socio-economic status also had an impact on the risk of developing RA with "Blue-collar workers" (those who do manual labour and earn an hourly wage) having an increased risk compared with white-collar workers (salaried professionals or educated workers) (OR 1.41: CI 1.02-1.94).

"The results of our study have confirmed that whether or not an individual smokes cigarettes, and the type of job that they do are surprisingly robust predictors of developing RA," said Dr Ulf Bergstrm, Department of Rheumatology, Skne University Hospital, Malm, Sweden, and lead author of the first study. "Investigating the impact of socio-economic factors on the development of RA could help us to understand disease mechanisms and identify preventative strategies in the future."

Results of a second Swedish study2 showed that smoking predicted a poor response to anti-TNFs, as measured by two indices of disease activity: A 'poor' EULAR response (based on the assessment of disease activity) at 3 months (OR 0.53, (95% CI 0.32-0.87), p=0.012) A poor Simplified Disease Activity Index (SDAI) response at 6 months (OR 0.45 (CI 0.27-0.77), p=0.0003) and at 6 months (OR 0.47, (CI 0.25-0.8
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Contact: Rory Berrie
eularpressoffice@uk.cohnwolfe.com
44-790-151-3297
European League Against Rheumatism
Source:Eurekalert

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