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Alpha1-antitrypsin phenotypes in patients with cryptogenic fibrosing alveolitis: a case-control study

R Hubbard, Y Baoku, N Kalsheker, J Britton, I Johnston
European Respiratory Journal 1997 10: 2881-2883; DOI:
R Hubbard
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Y Baoku
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N Kalsheker
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J Britton
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I Johnston
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Abstract

Cryptogenic fibrosing alveolitis (CFA) is an interstitial lung disease, which by definition is of unknown aetiology. Recent evidence has suggested that smoking and occupational exposure to dusts may be environmental risk factors for the disease, but there has been little research into potential host risk factors. One previous study has suggested that the prevalence of abnormal alpha1-antitrypsin phenotypes may be increased in patients with CFA. Since alpha1-antitrypsin is important in regulating inflammation within the lung in response to environmental exposures, such abnormalities may be of aetiological importance in this disease. We have compared the alpha1-antitrypsin phenotypes of 189 patients with CFA with 189 age-, sex-, and community-matched controls. This sample size was sufficient to provide more than 95% power to detect an odds ratio (OR) of 2.5. Alpha1-antitrypsin phenotype was established by isoelectric focusing, and the prevalence of abnormal phenotypes in cases and controls was compared by conditional logistic regression. Personal smoking histories were obtained by postal questionnaire. The prevalence of abnormal alpha1-antitrypsin phenotypes was similar in cases and controls (12.7 versus 15.3%; OR 0.88; 95% confidence interval 0.49-1.57; p=0.66). No interaction was found between the presence of abnormal alpha1-antitrypsin phenotypes and a history of smoking. We conclude that cryptogenic fibrosing alveolitis is not associated with abnormal alpha1-antitrypsin phenotypes.

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Alpha1-antitrypsin phenotypes in patients with cryptogenic fibrosing alveolitis: a case-control study
R Hubbard, Y Baoku, N Kalsheker, J Britton, I Johnston
European Respiratory Journal Dec 1997, 10 (12) 2881-2883;

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Alpha1-antitrypsin phenotypes in patients with cryptogenic fibrosing alveolitis: a case-control study
R Hubbard, Y Baoku, N Kalsheker, J Britton, I Johnston
European Respiratory Journal Dec 1997, 10 (12) 2881-2883;
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