An Efficacy and Safety of CNTO 1959 (Guselkumab) in Participants With Moderate to Severe Plaque-type Psoriasis

A Phase 3, Multicenter, Randomized, Double-blind, Placebo-controlled Study Evaluating the Efficacy and Safety of CNTO 1959 (Guselkumab) in the Treatment of Subjects With Moderate to Severe Plaque-type Psoriasis

The purpose of this study is to demonstrate the superiority of CNTO 1959 (guselkumab) to placebo in the treatment of participants with moderate to severe plaque-type psoriasis (A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches).

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 Investigator nor the participant know about the study treatment), placebo-controlled (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 CNTO 1959 (Guselkumab) in the treatment of participants with moderate to severe plaque-type psoriasis. Participants will receive either treatment of CNTO 1959 (guselkumab) 50 milligram (mg) or 100 mg or Placebo 50 mg or 100 mg. Participants will primarily be assessed for Investigator's Global Assessment (IGA) Score and Psoriasis Area and Severity Index (PASI). Participants' safety will be monitored throughout the study.

Inclusion Criteria:

• Have a diagnosis of plaque-type psoriasis with or without psoriatic arthritis for at least 6 months before Screening
• Have a PASI greater than or equal to (>=) 12 at Screening and at Baseline
• Have an IGA >= 3 at Screening and at Baseline
• Have an involved body surface area (BSA) >=10 percent (%) at Screening and at Baseline
• Be a candidate for phototherapy or systemic treatment for psoriasis (either naive or history of previous treatment)

Exclusion Criteria:

• Has a history of or current signs or symptoms of severe, progressive, or uncontrolled cardiac, vascular, pulmonary, gastrointestinal, endocrine, neurologic, hematologic, psychiatric, or metabolic disturbances
• Has unstable cardiovascular disease, defined as a recent clinical deterioration (example, unstable angina, atrial fibrillation) in the last 3 months or a cardiac hospitalization within the last 3 months before Screening
• Currently has a malignancy or has a history of malignancy within 5 years before screening (with the exception of a nonmelanoma skin cancer that has been adequately treated with no evidence of recurrence for at least 3 months before the first study drug administration or cervical carcinoma in situ that has been treated with no evidence of recurrence for at least 3 months before Screening
• Has a history of lymphoproliferative disease, including lymphoma; a history of monoclonal gammopathy of undetermined significance (MGUS); or signs and symptoms suggestive of possible lymphoproliferative disease, such as lymphadenopathy and/or splenomegaly
• Has a history of chronic or recurrent infectious disease, including but not limited to chronic renal infection, chronic chest infection (eg, bronchiectasis), recurrent urinary tract infection (recurrent pyelonephritis or chronic nonremitting cystitis), fungal infection (mucocutaneous candidiasis), or open, draining, or infected skin wounds or ulcers