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Oral contraceptives associated with increased risk of lupus
Date:4/7/2009

The ratio of women to men with the autoimmune disease systemic lupus erythematosus (SLE) is nine to one and the incidence increases after puberty. Hormones secreted by the body are therefore believed to play an important role in the origins of the disease. A new large, population-based observational study found that the use of oral contraceptives was associated with an increased risk of SLE, particularly among women who had recently started taking them. The study was published in the April issue of Arthritis Care & Research (http://www3.interscience.wiley.com/journal/77005015/home).

Led by Dr. Samy Suissa of the Centre for Clinical Epidemiology at Jewish General Hospital of McGill University in Montreal, researchers obtained data on more than 1.7 million women ages 18-45 from the U.K. General Practice Research Database, which contains more than 6 million people. The women all had prescriptions for combined oral contraceptives (COCs) containing estrogen and progestogen. During an average of eight years of follow-up, 786 women had a first-time diagnosis of SLE. Each case was matched with up to 10 controls among women without SLE at the time of the case's diagnosis.

The results showed that the use of COCs was associated with a significant increased risk of newly diagnosed SLE. This was mostly limited to the first three months of use with first- and second-generation contraceptives containing higher doses of estrogen, suggesting "an acute effect in susceptible women and possibly a dose-response effect of estrogen on SLE onset," according to the authors. They note that estrogen can directly modulate the immune response, which could complete the action of some sex-linked genes and contribute to the genetic predisposition of the disease, and it has also been shown to have an effect on the breakdown of immune tolerance seen in SLE.

Previous studies on the risk of SL
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Contact: Sean Wagner
medicalnews@bos.blackwellpublishing.com
781-388-8550
Wiley-Blackwell
Source:Eurekalert

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