Apremilast Pediatric Study in Children With Active Juvenile Psoriatic Arthritis

Inclusion Criteria: * Male or Female participants 5 to \< 18 years of age at the time of randomization. * Participant must have a confirmed diagnosis of juvenile psoriatic arthritis (JPsA) according to the International League of Associations for Rheumatology (ILAR) Edmonton Revision (Petty, 2001) classification criteria of at least 6 months duration: * Arthritis and psoriasis, OR * Arthritis with at least 2 of the following: * Dactylitis * Nail pitting or onycholysis * Psoriasis in a first-degree relative * Active disease: at least 3 active joints. * Inadequate response (at least 2 months) or intolerance to ≥ 1 disease-modifying anti-rheumatic drugs (DMARD), (which may include methotrexate \[MTX\] or biologic agents). Exclusion Criteria: * Exclusions per ILAR Edmonton Revision (Edmonton, 2001) criteria for JPsA include: * Arthritis in an HLA-B27-positive male with arthritis onset after 6 years of age * Ankylosing spondylitis, sacroiliitis with inflammatory bowel disease, Reiter's syndrome, acute anterior uveitis, or a history of one of these disorders in a first-degree relative * History of IgM rheumatoid factor on at least 2 occasions at least 3 months apart * Presence of systemic juvenile idiopathic arthritis (JIA). * Rheumatic autoimmune disease other than psoriatic arthritis (PsA), including, but not limited to: systemic lupus erythematosus, mixed connective tissue disease, scleroderma, polymyositis, or fibromyalgia. * Prior history of or current inflammatory joint disease other than PsA (eg, gout, reactive arthritis, rheumatoid arthritis, ankylosing spondylitis, Lyme disease).