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Allergy and autoimmune disease: a registry-based study

 

 

 

Clin Exp Allergy. 2008 Dec 2. [Epub ahead of print]

 

Allergy and autoimmune disease: a registry-based study.

 

Lindelöf B, Granath F, Tengvall-Linder M, Lindelöf H, Ekbom A. Department of Dermatology and Venereology, The Children's Hospital at Westmead, Sydney, Australia.

 

 

Background: Allergy and autoimmunity are two potential outcomes of a dysregulated immune system, but the relationship between them is unclear. It has been hypothesized that they could be inversely associated because of different T helper cell reactivity patterns. However, both positive and negative associations have been reported. Therefore, our aim was to perform a large epidemiological study with a defined allergic disease cohort.

 

Methods: During the years 1990-2002, 68 770 subjects were tested for total serum IgE (Total-IgE) and 72 228 were tested with Phadiatop for diagnosing allergic disease at Karolinska University Hospital, Stockholm, Sweden. This cohort was then linked with the Swedish Inpatient Registry 1968-2004 for a follow-up with regard to recorded discharges for 28 autoimmune diseases. We then used Cox regression and logistic regression to estimate the risk of autoimmune diseases in general in the allergy-tested subjects.

 

Results: Subjects with positive Phadiatop test were at a statistically decreased risk of subsequent autoimmune disease in comparison with subjects with negative test; hazard ratio (HR): 0.80 [95% (Confidence interval) CI: 0.68-0.94). Prior autoimmune disease was associated with a decreased risk of positive Phadiatop test [odds ratio: 0.83 (95% CI: 0.72-0.96)] in comparison with negative test. Subjects with highly elevated Total-IgE were at a statistically increased risk of a subsequent autoimmune disease in comparison with subjects with normal levels [HR: 1.36 (95% CI: 1.09-1.70)], but no association was found between prior autoimmune disease and different Total-IgE levels.

 

Conclusion: The study supports the hypothesis that allergy, defined as positive Phadiatop test, could be inversely related to autoimmune disease but this association is weak.

 

PMID: 19068101 [PubMed - as supplied by publisher]

 


 

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