• Disease flare, defined as demonstrating at least a 30% worsening in at least 3 of the 6 JIA Core Set parameters with no more than 1 improving by more than 30% [ Time Frame: Measured at nine study visits over 14 months ] [ Designated as safety issue: No ]
  

Juvenile arthritis is a chronic disease affecting approximately 250,000 people younger than 16 years of age in the United States. Its symptoms include swelling, pain, and damage in the joints. Juvenile arthritis can take four different forms, including poly JIA. Poly JIA affects five or more joints, generally the smaller ones in wrists and fingers, causing stiffness, joint damage, and sometimes eye inflammation in the children and adolescents who suffer from it. Approximately 30% of people with juvenile arthritis have Poly JIA.

Treatment for juvenile arthritis involves drugs with escalating strength, depending on what each individual responds to best. The first treatment option is non-steroidal anti-inflammatory drugs (NSAIDs), such as Motrin IB and Aleve. The second treatment option is methotrexate (MTX). About 30% to 50% of poly JIA patients are effectively treated with MTX. Only if the patient does not respond to MTX is an anti-TNF drug used. Anti-TNF drugs often result in profound disease improvement, but unfortunately, they can have toxic side effects and are expensive.

For people whose poly JIA is inactive or minimally active on MTX or anti-TNF drugs, 50% to 80% experience a worsening of symptoms once they stop taking the medications. Most of these flare-ups occur within 8 months of stopping treatment. Currently, there is no way to predict which people with poly JIA can safely stop anti-TNF medications. This study will evaluate two different factors—levels of certain calcium binding proteins and production of TNF—for their use in predicting whether people with poly JIA are likely to experience a disease flare-up once they stop anti-TNF treatment. The study will also look for genetic markers that can serve as predictors of safe discontinuation of anti-TNF treatment.

Participation in this study will last up to 14 months and involve up to nine study visits. Visits will be conducted at study entry and after 3, 6, 7, 8, 9, 10, 12, and 14 months. The first three study visits will involve tests to determine baseline health indicators and to ensure inactive disease. If, after 6 months, participants continue to have inactive disease, they will be taken off their anti-TNF medications. For the remainder of the study, visits will be used to monitor disease activity. If participants experience any clinically defined disease flare-ups, they will immediately stop participating in the study and begin additional treatment as prescribed by their health care providers. At all study visits, participants will undergo a general physical examination, a joint examination, questionnaires about how the disease affects their lives, and blood collection for research samples.