Clinical Research Directory

Inclusion Criteria: * For patients with JIA * A diagnosis of JIA according to the ILAR criteria by the treating pediatric rheumatologist * Classification in one of the following ILAR JIA categories: oJIA, RF-pJIA, PsA, or undifferentiated arthritis * Age \< 6 years at onset * Onset of JIA symptoms no more than 6 months before enrolment * Duly executed, written, informed consent/assent obtained from the parents/patient. For control subjects * A diagnosis of Iridocyclitis not correlated to JIA by the treating pediatric ophtalmologist * Age ≤ 17 years at diagnosis * Duly executed, written, informed consent/assent obtained from the parents/patient. Exclusion Criteria: * For patients with JIA * Classification in one of the following ILAR JIA categories: systemic arthritis, RF-positive polyarthritis, enthesitis-related arthritis * Previous treatment with any synthetic or biologic DMARD before biologic sample collection. For control subjects ● Previous treatment with any synthetic or biologic DMARD before biologic sample collection.