SAT0432 Development of Positive Antinuclear Antibodies and Rheumatoid Factor in Systemic Juvenile Idiopathic Arthritis Points toward an Autoimmune Phenotype Later in the Disease Course

Abstract

BackgroundSystemic onset Juvenile Idiopathic Arthritis (JIA) is now commonly considered part of the group of autoinflammatory diseases. However, systemic inflammation tends to decrease over time, leading to a phenotype of...