The relative abundance of intact CXCL8(1-77) and elongated CXCL8(-2-77) in JIA synovial fluids was 37.4 ± 9.1% (mean ± SEM) and 14.2 ± 4.4% (mean ± SEM), respectively. This evidence concerns the gene CXCL8 and juvenile idiopathic arthritis.