2019 European League Against Rheumatism/American College of Rheumatology Classification Criteria for Systemic Lupus Erythematosus
Authors: Aringer Martin , Costenbader Karen , Daikh David , Brinks Ralph , Mosca Marta , Ramsey‐Goldman Rosalind , Smolen Josef S. , Wofsy David , Boumpas Dimitrios T. , Kamen Diane L. , Jayne David , Cervera Ricard , Costedoat‐Chalumeau Nathalie , Diamond Betty , Gladman Dafna D. , Hahn Bevra , Hiepe Falk , Jacobsen Søren , Khanna Dinesh , Lerstrøm Kirsten , Massarotti Elena , McCune Joseph , Ruiz‐Irastorza Guillermo , Sanchez‐Guerrero Jorge , Schneider Matthias , Urowitz Murray , Bertsias George , Hoyer Bimba F. , Leuchten Nicolai , Tani Chiara , Tedeschi Sara K. , Touma Zahi , Schmajuk Gabriela , Anic Branimir , Assan Florence , Chan Tak Mao , Clarke Ann Elaine , Crow Mary K. , Czirják László , Doria Andrea , Graninger Winfried , Halda‐Kiss Bernadett , Hasni Sarfaraz , Izmirly Peter M. , Jung Michelle , Kumánovics Gábor , Mariette Xavier , Padjen Ivan , Pego‐Reigosa José M. , Romero‐Diaz Juanita , Rúa‐Figueroa Fernández Íñigo , Seror Raphaèle , Stummvoll Georg H. , Tanaka Yoshiya , Tektonidou Maria G. , Vasconcelos Carlos , Vital Edward M. , Wallace Daniel J. , Yavuz Sule , Meroni Pier Luigi , Fritzler Marvin J. , Naden Ray , Dörner Thomas , Johnson Sindhu R. 
Published: August 2019

ObjectiveTo develop new classification criteria for systemic lupus erythematosus (SLE) jointly supported by the European League Against Rheumatism (EULAR) and the American College of Rheumatology (ACR).MethodsThis international initiative had four phases. 1) Evaluation of antinuclear antibody (ANA) as an entry criterion through systematic review and meta‐regression of the literature and criteria generation through an international Delphi exercise, an early patient cohort, and a patient survey. 2) Criteria reduction by Delphi and nominal group technique exercises. 3) Criteria definition and weighting based on criterion performance and on results of a multi‐criteria decision analysis. 4) Refinement of weights and threshold scores in a new derivation cohort of 1,001 subjects and validation compared with previous criteria in a new validation cohort of 1,270 subjects.ResultsThe 2019 EULAR/ACR classification criteria for SLE include positive ANA at least once as obligatory entry criterion; followed by additive weighted criteria grouped in 7 clinical (constitutional, hematologic, neuropsychiatric, mucocutaneous, serosal, musculoskeletal, renal) and 3 immunologic (antiphospholipid antibodies, complement proteins, SLE‐specific antibodies) domains, and weighted from 2 to 10. Patients accumulating ≥10 points are classified. In the validation cohort, the new criteria had a sensitivity of 96.1% and specificity of 93.4%, compared with 82.8% sensitivity and 93.4% specificity of the ACR 1997 and 96.7% sensitivity and 83.7% specificity of the Systemic Lupus International Collaborating Clinics 2012 criteria.ConclusionThese new classification criteria were developed using rigorous methodology with multidisciplinary and international input, and have excellent sensitivity and specificity. Use of ANA entry criterion, hierarchically clustered, and weighted criteria reflects current thinking about SLE and provides an improved foundation for SLE research.