We recorded insignificant relationships between COMP with BMI (r = 0.02, p = 0.350) and CRP (r = −0.20, p = 0.231) as well as COMP with ESR (r = −0.18, p = 0.184) in patients with JIA whose clinical condition had stabilized (inactive disease). This evidence concerns the gene COMP and juvenile idiopathic arthritis.