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Classification of myositis.

Ingrid E Lundberg1,2, Marianne de Visser3, Victoria P Werth4

  • 1Division of Rheumatology, Department of Medicine, Solna, Karolinska Institutet, and Karolinska University Hospital, Stockholm, Sweden.

Nature Reviews. Rheumatology
|April 14, 2018
PubMed
Summary
This summary is machine-generated.

Idiopathic inflammatory myopathies (IIMs), or myositis, are muscle disorders affecting other organs. Myositis-specific autoantibodies offer a new classification for IIMs, improving diagnosis and treatment strategies.

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Area of Science:

  • Rheumatology
  • Immunology
  • Neurology

Background:

  • Idiopathic inflammatory myopathies (IIMs), also known as myositis, are characterized by chronic skeletal muscle inflammation and weakness.
  • These conditions frequently involve other organs, impacting patient morbidity and mortality.
  • Current subclassification (polymyositis, dermatomyositis, inclusion body myositis) has limitations due to overlapping features and exclusion of non-myopathic subgroups.

Purpose of the Study:

  • To introduce a novel subclassification of IIMs based on myositis-specific autoantibodies.
  • To highlight the association of these autoantibodies with distinct clinical features.
  • To emphasize the utility of this new classification in identifying IIM subsets with predominant extramuscular symptoms.

Main Methods:

  • Analysis of clinical and histopathological features in patients with IIMs.
  • Identification and characterization of myositis-specific autoantibodies.
  • Correlation of autoantibody profiles with clinical phenotypes, including extramuscular manifestations.

Main Results:

  • Myositis-specific autoantibodies provide a more precise method for subtyping IIMs.
  • These autoantibodies are linked to specific clinical presentations and extramuscular involvement.
  • This approach can identify patients where extramuscular symptoms dominate, even with mild muscle involvement.

Conclusions:

  • Subclassification of IIMs by myositis-specific autoantibodies offers a valuable alternative to current methods.
  • Recognition of IIM subphenotypes with predominant single-organ involvement is crucial for early diagnosis and management.
  • This classification aids in patient stratification for clinical studies and the development of targeted therapies.