Luu, Q.Day, J.Hall, A.Limaye, V.Major, G.2025-12-182025-12-182020Annals of the Rheumatic Diseases, 2020; 81(4):1-10003-49671468-2060https://hdl.handle.net/11541.2/143394Link to a related website: https://ard.bmj.com/content/annrheumdis/early/2020/07/28/annrheumdis-2020-217568.full.pdf, Open Access via UnpaywallWe have read with great interest the article published by Jinnin et al, which was an external validation of sensitivity and specificity of the EULAR/ACR (European League Against Rheumatism / American College of Rheumatology) classification criteria for idiopathic inflammatory myopathies with a Japanese cohort. The title and article claim that this is the first external validation study. While this may be true for a Japanese cohort, our intention is to alert the readers to the earlier published validation studies that preceded this and help highlight the complete body of evidence that should be considered.enCopyright 2020 Author(s) (or their employer(s))HumansMyositisRheumatic DiseasesSensitivity and SpecificityRheumatologyJapanJournal article10.1136/annrheumdis-2020-2175682-s2.0-85084975703Limaye, V. [0000-0002-8142-9532]