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Participants will receive guselkumab 100 milligram (mg) Subcutaneous (SC) injection at Weeks 0, 4, 12, 20, 28, 36, and 44 and placebo SC at Week 24 to maintain the blind. At Week 16, Participants who meet the early escape criteria will receive placebo at Week 16 and guselkumab at Week 20, then guselkumab every 8 weeks (q8w).

Participants will receive placebo SC injection at Weeks 0, 4, 12, and 20, and will crossover to receive guselkumab 100 mg SC injection at Weeks 24, 28, 36, and 44. At Week 16, Participants who meet the early escape criteria will receive guselkumab at Weeks 16 and 20, then guselkumab q8w.

Participants will receive guselkumab 100mg as SC injection.

Guselkumab 100 mg

Participants will receive placebo as SC injection.

Placebo

Janssen Pharmaceutica N.V., Belgium Clinical Trial

The purpose of this study is to evaluate guselkumab efficacy versus placebo in participants with active psoriatic arthritis (PsA) and an inadequate response to Anti-Tumor Necrosis Factor Alpha (TNF-alpha) therapy by assessing the reduction in signs and symptoms of joint disease.

Psoriatic arthritis is a multi-faceted disease that impacts the joints, soft tissues, and skin, all of which not only results in functional disability and impaired quality of life, but participants with this disease also have increased mortality. Guselkumab is a monoclonal antibody that binds to human interleukin 23 (IL-23) and inhibits IL-23 specific intracellular signaling and subsequent activation and cytokine production. Investigation of guselkumab in this Phase 3b PsA clinical study is supported by the favorable efficacy and safety results from Phase 2 study of guselkumab in PsA and Phase 2 and Phase 3 studies in psoriasis including the subset of participants with PsA. The primary hypothesis is that guselkumab 100 milligram (mg) at Weeks 0, 4, and every 8 weeks (q8w) thereafter is superior to placebo which will be assessed by the proportion of participants achieving an American College of Rheumatology (ACR 20) response at Week 24. The study includes 2 periods: A 24-week double-blind, placebo-controlled period for the primary analysis of the efficacy and safety of guselkumab, compared with placebo and a 32-week active-treatment and safety follow-up period for additional analysis of the efficacy and safety of guselkumab. Safety will be monitored throughout the study (Up to Week 56).

A Study of Guselkumab in Participants With Active Psoriatic Arthritis and an Inadequate Response to Anti-Tumor Necrosis Factor Alpha (Anti-TNF Alpha) Therapy

Phase 3b, Multicenter, Randomized, Double-blind, Placebo-controlled Study to Evaluate the Efficacy and Safety of Guselkumab Administered Subcutaneously in Participants With Active Psoriatic Arthritis and an Inadequate Response to Anti-Tumor Necrosis Factor Alpha (Anti-TNFα) Therapy

The data sharing policy of the Janssen Pharmaceutical Companies of Johnson \& Johnson is available at www.janssen.com/clinical-trials\\transparency.

As noted on this site, requests for access to the study data can be submitted through Yale open Access (YODA) Project site at yoda.yale.edu

The ACR 20 Response is defined as greater than or equal to (\>=) 20 percent (%) improvement in swollen joint count (66 joints) and tender joint count (68 joints) and \>=20 percent improvement in 3 of following 5 assessments: participant's assessment of pain using Visual Analog Scale (VAS; 0-10 millimeter \[mm\], 0 mm=no pain and 10 mm=worst possible pain), participant's global assessment of disease activity by using VAS (scale ranges from 0 mm to 100 mm, \[0 mm=no pain to 100 mm=worst possible pain\]), physician's global assessment of disease activity using VAS, participant's assessment of physical function measured by Health Assessment Questionnaire-Disability Index (HAQ-DI, defined as a 20-question instrument assessing 8 functional areas. The derived HAQ-DI ranges from 0, indicating no difficulty, to 3, indicating inability to perform a task in that area) and C-reactive protein (CRP).

The HAQ-DI is a 20-question instrument that assesses the degree of difficulty a person has in accomplishing tasks in 8 functional areas (dressing, arising, eating, walking, hygiene, reaching, gripping and activities of daily living). Responses in each functional area are scored from 0 to 3 (0=no difficulty and 3=inability to perform a task in that area). Overall score is computed as the sum of domain scores and divided by the number of domains answered. Total possible score range 0-3 where 0 = least difficulty and 3 = extreme difficulty.

The ACR 50 Response is defined as greater than or equal to (\>=) 50 percent improvement in swollen joint count (66 joints) and tender joint count (68 joints) and \>=50 percent improvement in 3 of following 5 assessments: participant's assessment of pain using Visual Analog Scale (VAS; 0-10 millimeter \[mm\], 0 mm=no pain and 10 mm=worst possible pain), participant's global assessment of disease activity by using VAS (scale ranges from 0 mm to 100 mm, \[0 mm=no pain to 100 mm=worst possible pain\]), physician's global assessment of disease activity using VAS, participant's assessment of physical function measured by Health Assessment Questionnaire-Disability Index (HAQ-DI, defined as a 20-question instrument assessing 8 functional areas. The derived HAQ-DI ranges from 0, indicating no difficulty, to 3, indicating inability to perform a task in that area) and C-reactive protein (CRP).

The SF-36 is a generic health survey with 36 items that measure functional health and well-being from the participant's perspective. The survey is summarized into 8 dimensions/scales: physical functioning (PF), role-physical (RP), bodily pain (BP), general health (GH), vitality (VT), social functioning (SF), role-emotional (RE), and mental health (MH). The physical component summary measure is derived from 4 of the 8 health dimensions (aggregate of PF, RP, BP, and GH scales). The minimum score is 0 and the maximum score is 100. A higher score indicates a better health state.

PASI 100 response is defined as 100% improvement in PASI score from baseline (PASI score of 0). The PASI is a system used for assessing and grading the severity of psoriatic lesions and their response to therapy. In the PASI scoring system, the body is divided into 4 regions: the head, trunk, upper extremities, and lower extremities. Each of these areas is assessed separately for the percentage of the area involved, which translates to a numeric score that ranges from 0 (indicates no involvement) to 6 (90%-100% involvement), and for erythema, induration, and scaling, which are each rated on a scale of 0 to 4. The PASI produces a numeric score that could range from 0 (no psoriasis) to 72. A higher score indicates more severe disease.

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization	Link
A Study of Guselkumab in Participants With Active Psoriatic Arthritis and an Inadequate Response to Anti-Tumor Necrosis Factor Alpha (Anti-TNF Alpha) Therapy	NCT03796858	Arthritis, Psor...	Guselkumab 100 ... Placebo	18 Years -	Janssen Pharmaceutica N.V., Belgium
A Study of Guselkumab in Participants With Active Psoriatic Arthritis and an Inadequate Response to Anti-Tumor Necrosis Factor Alpha (Anti-TNF Alpha) Therapy	NCT03796858	Arthritis, Psor...	Guselkumab 100 ... Placebo	18 Years -	Janssen Pharmaceutica N.V., Belgium

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