Cigarette smoking increases the risk of rheumatoid arthritis. Results from a nationwide study of disease-discordant twins
- PMID: 8639169
- DOI: 10.1002/art.1780390504
Cigarette smoking increases the risk of rheumatoid arthritis. Results from a nationwide study of disease-discordant twins
Abstract
Objective: To test the hypothesis that cigarette smoking is associated with susceptibility to rheumatoid arthritis (RA) by comparing smoking history between twins with RA and their unaffected co-twins.
Methods: Interview questionnaires on smoking history were administered to 79 identical (monozygotic [MZ]) and 71 same-sex nonidentical (dizygotic, [DZ]) twin pairs who were discordant for RA, recruited from the Arthritis and Rheumatism Council Twin Study. Results were expressed as odds ratios (OR) with 95% confidence intervals (95% CI).
Results: Although most twin pairs were concordant for smoking history, there was a strong association between ever smoking and RA in the MZ pairs (OR 12.0, 95% CI 1.78-513), with a similar trend observed in the DZ pairs (OR 2.5, 95% CI 0.92-7.87).
Conclusion: The discordance in cigarette smoking history for individuals who are at presumed identical genetic risk for RA supports other data suggesting the role of smoking in disease susceptibility.
Comment in
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Smoking and rheumatoid arthritis--observations from a multicase family study: comment on the article by Silman et al.Arthritis Rheum. 1997 Mar;40(3):594. doi: 10.1002/art.1780400335. Arthritis Rheum. 1997. PMID: 9082956 No abstract available.
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