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Environmental factors preceding illness onset differ in phenotypes of the juvenile idiopathic inflammatory myopathies

Lisa G Rider1, Lan Wu, Gulnara Mamyrova

  • 1Environmental Autoimmunity Group, National Institute of Environmental Sciences, National Institutes of Health, DHHS, Clinical Research Center Room 4-2352, 10 Center Drive, MSC 1301, Bethesda, MD 20892-1301, USA. riderl@mail.nih.gov

Rheumatology (Oxford, England)
|August 31, 2010
PubMed
Abstract

Insights

Environmental exposures preceding juvenile idiopathic inflammatory myopathies (JIIMs) vary by phenotype. Infections, medications, and immunizations were common triggers, suggesting multiple factors contribute to JIIM development.

Area of Science:

  • Pediatric Rheumatology
  • Environmental Medicine
  • Immunology

Background:

  • Juvenile idiopathic inflammatory myopathies (JIIMs) are rare autoimmune diseases.
  • The role of environmental factors in JIIM onset is not fully understood.
  • Understanding potential triggers is crucial for diagnosis and management.

Purpose of the Study:

  • To investigate if environmental exposures differ based on JIIM phenotypes.
  • To identify specific factors temporally associated with JIIM onset.

Main Methods:

  • A case-control study involving 285 patients with JIIM.
  • Physicians completed questionnaires on exposures (infections, medications, immunizations, etc.) within 6 months pre-onset.
  • Phenotypes were determined by clinical and laboratory criteria.

Main Results:

  • 60% of JIIM patients reported at least one exposure before illness onset.
  • Infections were the most frequent exposure (44%), followed by medications (18%) and immunizations (11%).
  • Exposures varied significantly by age at diagnosis, race, disease course, and autoantibody presence.

Conclusions:

  • Multiple environmental exposures may contribute to JIIM development.
  • The pattern of these exposures appears to be phenotype-specific.
  • Further research into specific triggers could inform prevention and treatment strategies.

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