Efficacy, Safety, Pharmacokinetics and Immunogenicity Study of Abatacept Administered Intravenously to Treat Active Polyarticular-course Juvenile Idiopathic Arthritis in Japan

A Phase III, Multicenter, Open-Label Study to Assess Efficacy, Safety, Pharmacokinetics and Immunogenicity of Abatacept Administered Intravenously in Japanese Children and Adolescents With Active Juvenile Idiopathic Arthritis Who Have a History of an Inadequate Response or Intolerance to Methotrexate or Biologics

The purpose of this study is to assess the efficacy of Abatacept after intravenous administration in Japanese children and adolescents with active juvenile idiopathic arthritis who have a history of an inadequate response or intolerance to Methotrexate or biologics

Inclusion Criteria:

• Subjects who have a history of an inadequate therapeutic response or intolerance in the opinion of the examining physician to at least one biologics or Methotrexate (MTX).

• Diagnosis of Juvenile Idiopathic Arthritis (JIA) by International League of Associations for Rheumatology (ILAR) criteria as oligoarticular, polyarticular Rheumatoid Factor (RF+), polyarticular (RF-), or systemic with a polyarticular-course.

• Men and women, ages 4 to 17 years, inclusive at enrollment.

• Subjects must have a history of at least 5 joints with active disease and must have currently active articular disease as defined by:

  1. ≥2 active joints (e.g. presence of swelling, or if no swelling is present, limitation of motion (LOM) accompanied by pain, tenderness, or both) at screening and at Week 0 (Day 1).
  2. ≥2 joints with LOM at screening and at Week 0 (Day 1).

Exclusion Criteria:

• Systemic onset JIA with any of the following manifestations within the last 6 months prior to enrollment: intermittent fever due to JIA, rheumatoid rash, hepatosplenomegaly, pleuritis, pericarditis, or macrophage activation syndrome.
• Presence of any other rheumatic disease or major chronic infectious/inflammatory/immunologic disease (e.g. inflammatory bowel disease, psoriatic arthritis, spondyloarthropathy, hypogammaglobulinemia, or systemic lupus erythematosus, etc.)