Study Description

Study Design

Groups and Cohorts

Outcome Measures

Primary Outcome Measures

1. Cohort 1: Steady-state Trough Serum Concentration of Ustekinumab at Week 28 by Baseline Age Groups [Week 28]
   Steady-state trough serum concentration of ustekinumab at Week 28 by baseline age groups will be reported.
2. Cohort 2: Steady-state Trough Serum Concentration of Guselkumab at Week 28 by Baseline Age Groups [Week 28]
   Steady-state trough serum concentration of guselkumab at Week 28 by baseline age groups will be reported.
3. Cohort 1: Area Under the Curve at Steady-state (AUCss) Over a 12-Week Dosing Interval of Ustekinumab at Week 28 by Baseline Age Groups [Week 28]
   AUCss is defined as area under the curve at steady-state over a 12-week dosing interval of ustekinumab at Week 28 by baseline age groups.
4. Cohort 2: AUCss Over a Dosing Interval (4 or 8 Weeks) of Guselkumab at Week 28 by Baseline Age Groups [Week 28]
   AUCss is defined as area under the curve at steady-state over a dosing interval (4 or 8 weeks) of guselkumab at Week 28 by baseline age groups.
5. Cohort 1: Percentage of Participants with Juvenile Psoriatic Arthritis (jPsA) Achieving American College of Rheumatology (ACR) Pediatric 30 Response at Week 24 [Week 24]
   Percentage of Participants with jPsA achieving ACR pediatric 30 response at Week 24 will be reported. The ACR pediatric 30 response criteria is defined as a 30 percent (%) improvement (that is, a decrease in score) from baseline in greater than or equal to (>=) 3 of the following 6 components, with worsening of >=30% in no more than 1 of the following components: physician global assessment (PGA) of disease activity, patient/participant assessment of overall well-being, number of active joints (defined as swelling or loss of motion with pain and/or tenderness), number of joints with limited range of motion, physician function by childhood health assessment questionnaire (CHAQ) and C-reactive protein (CRP).
6. Cohort 2: Percentage of Participants with jPsA Achieving ACR Pediatric 30 Response at Week 24 [Week 24]
   Percentage of Participants with jPsA achieving ACR pediatric 30 response at Week 24 will be reported. The ACR pediatric 30 response criteria is defined as a 30% improvement (that is, a decrease in score) from baseline in >=3 of the following 6 components, with worsening of >=30% in no more than 1 of the following components: PGA of disease activity, patient/participant assessment of overall well-being, number of active joints (defined as swelling or loss of motion with pain and/or tenderness), number of joints with limited range of motion, physician function by CHAQ and CRP.

Secondary Outcome Measures

1. Cohorts 1: Steady-state Trough Serum Concentration of Ustekinumab at Week 52 by Baseline Age Groups [Week 52]
   Steady-state trough serum concentration of ustekinumab at Week 52 by baseline age groups will be reported.
2. Cohorts 2: Steady-state Trough Serum Concentration of Guselkumabat at Week 52 by Baseline Age Groups [Week 52]
   Steady-state trough serum concentration of guselkumab at Week 52 by baseline age groups will be reported.
3. Cohort 1: AUCss Over a 12-Week Dosing Interval of Ustekinumab at Week 52 by Baseline Age Groups [Week 52]
   AUCss is defined as area under the curve at steady-state over a 12-week dosing interval of ustekinumab at Week 52 by baseline age groups.
4. Cohort 2: AUCss Over a Dosing Interval (4 or 8 Weeks) of Guselkumab at Week 52 by Baseline Age Groups [Week 52]
   AUCss is defined as area under the curve at steady-state over a dosing interval (4 or 8 weeks) of guselkumab at Week 52 by baseline age groups.
5. Cohorts 1 and 2: Percentage of Participants Achieving ACR Pediatric 30 Response at Weeks 4, 8, 12, 16, and 52 [Weeks 4, 8, 12, 16 and 52]
   The ACR pediatric 30 response criteria is defined as a 30% improvement (that is, a decrease in score) from baseline in >=3 of the following 6 components, with worsening of >=30% in no more than 1 of the following components: PGA of disease activity, patient/participant assessment of overall well-being, number of active joints (defined as swelling or loss of motion with pain and/or tenderness), number of joints with limited range of motion, physician function by CHAQ and CRP.
6. Cohorts 1 and 2: Percentage of Participants Achieving ACR Pediatric 50 and 70 Responses at Weeks 4, 8, 12, 16, 24, and 52 [Weeks 4, 8, 12, 16, 24, and 52]
   The ACR pediatric 50 and 70 responses are defined as a 50% improvement or 70% improvement (that is, a decrease in score) from baseline in >=3 of the following 6 components, with worsening of >=30% in no more than 1 of the following components: 1 of the following components: PGA of disease activity, patient/participant assessment of overall well-being, number of active joints (defined as swelling or loss of motion with pain and/or tenderness), number of joints with limited range of motion, physician function by CHAQ and CRP.
7. Cohorts 1 and 2: Time to Response Measured as Time to Achieving ACR Pediatric 30 [Baseline, up to Week 24]
   Time to response measured as time to achieving ACR pediatric 30 will be reported.
8. Cohorts 1 and 2: Change from Baseline in Clinical Juvenile Arthritis Disease Activity Score (cJADAS) 10 at Weeks 4, 8, 12, 16, 24, and 52 [Baseline, up to Weeks 4, 8, 12, 16, 24, and 52]
   Change from baseline in cJADAS 10 at Weeks 4, 8, 12, 16, 24, and 52 will be reported. The cJADAS is calculated as the sum of the scores of its 3 components: (1) physician global rating of overall disease activity, measured on a 10-cm horizontal visual analog scale; (2) parent/child ratings of well-being, assessed on a 10 cm horizontal line VAS; (3) number of active joints, assessed in 10 joints, for a total score ranging from 0 to 30 where 0=no activity and 30=maximum activity.
9. Cohorts 1 and 2: Change from Baseline in Juvenile Arthritis Disease Activity Score (JADAS) 10, 27 and 71 at Weeks 4, 8, 12, 16, 24, and 52 [Baseline, up to Weeks 4, 8, 12, 16, 24, and 52]
   Change from baseline in JADAS 10, 27 and 71 at Weeks 4, 8, 12, 16, 24, and 52 will be reported. The JADAS is calculated as the sum of the scores of its 4 components: (1) physician global rating of overall disease activity, measured on a 10-cm horizontal visual analog scale; (2) parent/child ratings of well-being, assessed on a 10 cm horizontal line VAS; (3) number of active joints, assessed in 71, 27, or 10 joints (for JADAS 71, JADAS 27, and JADAS 10, respectively); (4) CRP (truncated to 0-10 mg/dL).
10. Cohorts 1 and 2: Change from Baseline in Psoriasis Area Severity Index (PASI) Score at Week 24 [Baseline and Week 24]
    Change from baseline in PASI score at Week 24 among the participants with greater than or equal to (>=) 3% body surface area (BSA) psoriatic involvement and a PGA psoriasis score of >=2 (mild) at baseline will be reported. The PASI includes assessments of 4 areas of the body: the head and neck, the arms, the trunk, and the legs. The percentage of skin in each area affected by psoriasis is given a numeric score representing the proportion involved. The severity of the 3 plaque signs of erythema, thickness/induration, and desquamation/scaling, is assessed on a 5-point scale. The total PASI score is from 0-72, where 0=no disease and 72=more disease.
11. Cohorts 1 and 2: Percentage of Participants with Adverse Events (AEs) [Up to Week 68]
    An AE is any untoward medical occurrence in a participant participating in a clinical study that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study.
12. Cohorts 1 and 2: Percentage of Participants with Serious Adverse Events (SAEs) [Up to Week 68]
    A SAE is any untoward medical occurrence that at any dose results in any of the following outcomes: death; initial or prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly/birth defect; suspected transmission of any infectious agent via a medicinal product or medically important.
13. Cohorts 1 and 2: Percentage of Participants with Reasonably Related AEs [Up to Week 68]
    Percentage of participants with reasonably related AEs (including injection-site reactions and infections) will be reported.
14. Cohorts 1: Number of Participants with Antibodies to Ustekinumab [Weeks 52 and 68]
    Number of participants with antibodies to ustekinumab (including peak titers) will be reported.
15. Cohorts 2 : Number of Participants with Antibodies to Guselkumab [Weeks 52 and 68]
    Number of participants with antibodies to guselkumab (including peak titers) will be reported.

Eligibility Criteria

Contacts and Locations

More Information

Additional Relevant MeSH Terms

• Arthritis
• Arthritis, Psoriatic
• Arthritis, Juvenile
• Joint Diseases
• Musculoskeletal Diseases
• Spondylarthropathies
• Spondylarthritis
• Spondylitis
• Spinal Diseases
• Bone Diseases
• Psoriasis
• Skin Diseases, Papulosquamous
• Skin Diseases
• Rheumatic Diseases
• Connective Tissue Diseases
• Autoimmune Diseases
• Immune System Diseases