Decreased progression to systemic lupus erythematosus in patients with cutaneous lupus erythematosus under European League Against Rheumatism/American College of Rheumatology criteria

To the Editor: Patients with cutaneous lupus erythematosus (CLE) are at the risk of developing systemic lupus erythematosus (SLE). Most studies have used the 1982 American College of Rheumatology (ACR) criteria to identify patients with CLE who progress to SLE, reporting progression rates of 12% to 17%.1,2 We found a lower progression rate with the 2012 Systemic Lupus International Collaborating Clinics (SLICC) criteria than with the ACR criteria in our patient cohort.3 Because the 2019 European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) criteria is yet to be utilized for studying CLE-to-SLE progression, we sought to compare the progression rates, baseline risk factors, and criteria gained among all 3 criteria.