Applying SLICC and ACR/EULAR systemic lupus erythematosus classification criteria in a cohort of patients with undifferentiated connective tissue disease.

Background/objective: New classification criteria for SLE have recently been developed. How these criteria affect the classification of patients with the SLE-mimicking condition UCTD is poorly understood. This study investigated the reclassification of UCTD patients using newly derived SLE criteria.