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Low birth weight and childhood infections predict ankylosing spondylitis

Data suggest role of environmental factors in AS

2015-06-11
(Press-News.org) Rome, Italy, 11 June 2015: The results of a study presented today at the European League Against Rheumatism Annual Congress (EULAR 2015) Press Conference showed that a diagnosis of ankylosing spondylitis (AS) can be predicted by low birth weight, having older siblings and hospitalisation for infection between the ages of 5-16 years. These data suggest that these factors play an important role in the pathogenesis of the disease.

AS is a painful and progressive form of arthritis caused by chronic inflammation of the joints in the spine. Prevalence of AS varies globally, and is estimated at 23.8 per 10,000 in Europe and 31.9 per 10,000 in North America.

The cause of AS is unknown. Although AS is strongly associated with the genotype HLA-B27, not everyone testing positive for the marker goes on to develop the disease.

"A link between AS and the HLA-B27 genotype was established more than three decades ago, yet studies on the environmental risk factors are few," said study investigator Dr. Ulf Lindström, Institute of Medicine, Rheumatology and Inflammation Research, Sahlgrenska Academy, Sweden. "Our research has identified three factors associated with significantly increased risk of the disease in later life. These data strengthen our understanding of the interplay between genetics and environment in AS, and bring us closer to pinpointing the underlying cause of the disease."

Statistically significant increased risks were observed for birth weight under 3,000g (18% vs. 15%), having older siblings (63% vs. 58%) and for hospitalisation due to infections at age 5-12 (5% vs. 3%) and age 13-16 (2% vs. 1%). These factors have been implicated in other, associated disease; the triggering effect of infections in reactive arthritis has been established, birth weight has been shown to predict development of autoimmune disease (diabetes and rheumatoid arthritis), and a link between older siblings and disease risk has been demonstrated in asthma.

Data from several Swedish national registers were used for this study, with five matched controls (sex, age, county) identified for each case of AS. Exposures assessed were birth weight, gestational age, type of birth (single/multiple), number of older siblings and exposure to infections.

INFORMATION:

Abstract Number: OP0275 NOTES TO EDITORS: For further information on this study, or to request an interview with the study lead, please do not hesitate to contact the EULAR congress Press Office in Room 5B of Fiera Roma during EULAR 2015 or on:
Email: eularpressoffice@cohnwolfe.com
Onsite tel: +44 (0) 7738 890 799/ +44 (0) 20 7331 5442
Twitter: @EULAR_Press
Youtube: Eular Pressoffice

About EULAR The European League Against Rheumatism (EULAR) is an umbrella organisation which represents scientific societies, health professional associations and organisations for people with rheumatic diseases throughout Europe.

EULAR aims to promote, stimulate and support the research, prevention, and treatment of rheumatic diseases and the rehabilitation of those it affects.

With 45 scientific member societies, 35 People with Arthritis and Rheumatism in Europe (PARE) organisations, 19 health professionals associations and 21 corporate members, EULAR highlights the importance of combating rheumatic diseases through both medical means and patient care.

EULAR 2015 is set to be the biggest rheumatology event in Europe with around 14,000 scientists, physicians, allied health professionals and related audiences in attendance from more than 120 countries. Over the course of the congress there will be some 300 oral and just under 2,000 poster abstract presentations, more than 150 sessions, 400 lectures, 40 poster tours and 350 invited speakers.

To find out more about the activities of EULAR, visit: http://www.eular.org



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[Press-News.org] Low birth weight and childhood infections predict ankylosing spondylitis
Data suggest role of environmental factors in AS