Conditions: Arthritis, Psoriatic
Keywords: Psoriatic arthritis Golimumab Simponi
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 480
Healthy volunteers: no

Brief summary:
The purpose of this study is to evaluate the efficacy of intravenously (administration of a fluid into the vein) administered golimumab 2 milligram per kilogram (mg/kg) in participants with active psoriatic arthritis (a chronic inflammatory arthritis that is associated with psoriasis).

Detailed description:
This is a Phase 3, multicenter (when more than one hospital or medical school team work on a medical research study), randomized (study drug assigned by chance), double-blind (neither the researchers nor the participants know what treatment the participant is receiving), placebo-controlled (an inactive substance; a pretend treatment \[with no drug in it\] that is compared in a clinical trial with a drug to test if the drug has a real effect) study of golimumab compared with placebo in participants with active psoriatic arthritis. The study will include 4 phases: Screening phase (up to 6 weeks), Double-blind placebo-controlled phase (Week 0 to Week 24), Active treatment phase (Week 24 to Week 52), and Safety follow-up phase (8 weeks from last study drug administration). Total duration of the study will be 60 weeks per participant. Eligible Participants will be randomly assigned to either Treatment Group 1: Placebo or Treatment Group 2: Golimumab. Participants randomized to Placebo Group, will receive intravenous infusions of placebo at Weeks 0, 4, 12 and 20. At Week 24, all participants receiving placebo will begin receiving intravenous infusions of golimumab (2 mg/kg) at Week 24, 28 and thereafter every 8 weeks up to Week 52. Participants randomized to Golimumab Group, will receive intravenous infusions of golimumab 2 mg/kg at Week 0, 4 and thereafter every 8 weeks up to Week 52. At Week 24, participants randomized to golimumab Group will receive a placebo infusion to maintain the blind. The efficacy will be assessed primarily by measuring percentage of participants who achieve a 20 percent improvement from baseline in the assessment used in active psoriatic arthritis at Week 14. Participants' safety will be monitored throughout the study.

Arms:
arm 1: Participants will receive intravenous infusions of placebo at Weeks 0, 4, 12 and 20. At Week 24, all participants receiving placebo will begin receiving intravenous infusions of golimumab 2 milligram per kilogram (mg/kg) at Week 24, 28 and thereafter every 8 weeks up to Week 52. arm 2: Participants will receive intravenous infusions of golimumab 2 mg/kg at Weeks 0, 4 and thereafter every 8 weeks up to Week 52. At Week 24, participants will receive a placebo infusion to maintain the blind.

Interventions: intervention 1: Placebo intervention 2: Golimumab
Intervention descriptions: intervention 1: Participants will receive intravenous infusions of placebo at Weeks 0, 4, 12 and 20 in treatment Group 1 and intravenous infusions of placebo at Week 24 to maintain the blind in treatment Group 2. intervention 2: Participants will receive intravenous infusions of golimumab 2mg/kg at Weeks 0, 4 and thereafter every 8 weeks up to Week 52 in treatment Group 2 and intravenous infusions of golimumab (2mg/kg) at Weeks 24, 28 and thereafter every 8 weeks up to Week 52 in treatment Group 1.

Protocol document: