A Study Comparing Risankizumab to Placebo in Participants With Active Psoriatic Arthritis Including Those Who Have a History of Inadequate Response or Intolerance to Biologic Therapy(Ies)

The purpose of this study is to evaluate the safety and efficacy of risankizumab in adults with moderately to severely active psoriatic arthritis (PsA).

The study consists of a Screening Period (approximately 35 days), Period 1, Period 2, and a 20-week Follow-up Period. Period 1 is a 24-week randomized, double-blind, placebo-controlled, parallel-group period. Period 2 is the long-term period and starts at Week 24. To maintain the blind to the original treatment allocation, treatment at the Week 24 Visit is blinded: participants randomized to placebo receive blinded risankizumab 150 mg, and participants randomized to risankizumab receive blinded placebo. At Week 28 and for the remaining dosing visits (to Week 316), all participants receive open-label risankizumab 150 mg every 12 weeks. Participants remain blinded to the original randomization allocation for the duration of the study. The total study duration is 336 weeks including a telephone call 140 days (20 weeks) after last dose of study drug.

Inclusion Criteria: * Clinical diagnosis of psoriatic arthritis (PsA) with symptom onset at least 6 months prior to the Screening Visit and fulfillment of the Classification Criteria for PsA (CASPAR) at Screening Visit. * Participant has active disease defined as ≥ 5 tender joints (based on 68 joint counts) and ≥ 5 swollen joints (based on 66 joint counts) at both the Screening Visit and Baseline. * Diagnosis of active plaque psoriasis, with at least one psoriatic plaque of ≥ 2 cm diameter or nail changes consistent with psoriasis at Screening Visit. * Participant has demonstrated an inadequate response or intolerance to biologic therapy(ies) or conventional synthetic disease modifying anti-rheumatic drugs (csDMARD) therapy(ies). Exclusion Criteria: * Participant is considered by investigator, for any reason, to be an unsuitable candidate for the study. * Participant has a known hypersensitivity to risankizumab.