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It was with much interest that we read the recent European League Against Rheumatism/American College of Rheumatology classification criteria for idiopathic inflammatory myopathies.1 These criteria include Jo-1 autoantibodies, and the authors discussed that future updates of the criteria should also include the more recently identified myositis-specific autoantibodies.1 2 The interest in autoantibodies for classification is also illustrated by a recent proposal for a new clinicoserological classification of adult autoimmune myositis, which is based on the association of autoantibodies with distinct clinical phenotypes.3 4 For example, antibodies to synthetases (eg, Jo-1, PL-7 and PL-12) define the antisynthetase syndrome, anti-MDA-5 antibodies are associated with myositis with overlap features such as interstitial lung disease, anti-TIF-1γ and anti-NXP-2 define a subgroup of dermatomyositis and anti-SRP and anti-HMGCR are associated with necrotising autoimmune myositis.2
As autoantibodies play a role in the newly proposed classifications,1 …
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