• ERA patients with positive HLA-B27 had significantly higher levels of inflammatory markers with lower hemoglobin and hematocrit at initial diagnosis, increased disease activity assessed by the Juvenile Spondyloarthritis Disease Activity (JSpADA) score at 6 and 12 months of follow-up, greater utilization of bridging systemic corticosteroids and anti-TNF, and longer duration of methotrexate use. The gene discussed is TNF; the disease is spondyloarthropathy.