When children with polyarticular juvenile idiopathic arthritis (JIA) reach adulthood, they have a condition similar to that of patients with adult onset rheumatoid arthritis (RA). In the present study, the clinical and immunological characteristics of these two groups of patients are compared. The presence of autoantibodies, subcutaneous nodules, secondary Sjögren syndrome, and hypothyroidism, was determined in 20 adult patients with polyarticular JIA and in 50 patients with RA (paired for gender and duration of the disease), as well as the determination of functional and anthropometric indexes. Both groups had similar characteristics, except for the presence of rheumatoid factor (lower in the polyarticular JIA group; P = 0.026) and lower BMI in patients with polyarticular JIA (P < 0.001).
juvenile idiopathic arthritis; rheumatoid arthritis; rheumatoid factor; evolution
