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Systemic Lupus Erythematosus Classification and Diagnosis.

Martin Aringer1, Sindhu R Johnson2

  • 1Division of Rheumatology, Department of Medicine III, University Medical Center, Faculty of Medicine Carl Gustav Carus at the TU Dresden, Fetscherstrasse 74, Dresden 01037, Germany.

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Summary

The 2019 European League Against Rheumatism/American College of Rheumatology classification criteria for systemic lupus erythematosus (SLE) demonstrate strong international validation, performing well in diverse populations including East Asian and pediatric cohorts. While antinuclear antibody (ANA) status was debated, its impact is minimal given the small ANA-negative patient group.

Keywords:
Antinuclear antibodiesClassification criteriaCutaneous lupus erythematosusNeuropsychiatric SLESensitivitySpecificitySystemic lupus erythematosus

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Area of Science:

  • Rheumatology
  • Immunology
  • Clinical Classification

Background:

  • The 2019 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria for systemic lupus erythematosus (SLE) were introduced to improve diagnostic accuracy.
  • External validation studies are crucial to assess the generalizability and performance of new classification criteria across diverse populations.

Purpose of the Study:

  • To evaluate the external validity and performance of the 2019 EULAR/ACR SLE classification criteria.
  • To assess the criteria's effectiveness in various ethnic and age groups, including East Asian and pediatric cohorts.
  • To analyze the impact of antinuclear antibody (ANA) status on the criteria's performance.

Main Methods:

  • Systematic review and external validation of the 2019 EULAR/ACR SLE classification criteria using worldwide cohorts.
  • Analysis of criterion performance across different demographic groups (e.g., East Asian, pediatric).
  • Assessment of the role of ANA as an entry criterion and its implications for ANA-negative SLE patients.

Main Results:

  • The 2019 EULAR/ACR SLE classification criteria have been successfully validated by international research groups.
  • The criteria demonstrated good performance in East Asian and pediatric patient cohorts.
  • The inclusion of ANA as an entry criterion was discussed, but the impact on overall performance is limited due to the small proportion (<5%) of ANA-negative SLE patients.

Conclusions:

  • The 2019 EULAR/ACR SLE classification criteria are robust and perform well globally, including in specific subpopulations.
  • While ANA-negative SLE patients represent a small subset, their classification needs careful consideration.
  • The criteria offer valuable insights for diagnostic considerations, though they are intended for classification, not standalone diagnosis.