A Study of Tildrakizumab in Pediatric Subjects With Chronic Plaque Psoriasis

Inclusion Criteria:

1. Subject must be 6 to < 18 years of age, of either sex, of any race/ ethnicity, must weight greater than or equal to 15Kg.
2. Diagnosis of predominantly plaque psoriasis for ≥6 months (as determined by subject interview and confirmation of diagnosis through physical examination by investigator).
3. Moderate to severe psoriasis at baseline defined as: at least 10% Body Surface Area (BSA) involvement, PGA score ≥ 3, and PASI score ≥ 12
4. Subject must be considered a candidate for systemic therapy, meaning psoriasis inadequately controlled by topical treatments (corticosteroids), and/or phototherapy, and/or previous systemic therapy
5. Subject is considered to be eligible according to tuberculosis (TB) screening criteria
6. A maximum of 2 QuantiFERON tests will be allowed. A re-test is only permitted if the first is indeterminate; the result of the second test will then be used.

Exclusion Criteria:

1. Subject has predominantly non-plaque forms of psoriasis specifically erythrodermic psoriasis, predominantly pustular psoriasis, medication-induced or medication-exacerbated psoriasis, or new-onset guttate psoriasis
2. Subject has laboratory abnormalities at screening including any of the following: Alanine transaminase (ALT) or aspartate transaminase, (AST) ≥2X the upper limit of normal, Creatinine ≥1.5X the upper limit of normal serum direct bilirubin ≥ 1.5 mg/dL, white blood cell count < 3.0 x 103/μL, and any other laboratory abnormality, which, in the opinion of the Investigator, will prevent the subject from completing the study or will interfere with the interpretation of the study results
3. Subject who is expected to require topical therapy, phototherapy, or additional systemic therapy for psoriasis during the trial
4. Female subjects of childbearing potential who are pregnant, intend to become pregnant (within 6 months of completing the trial), or are lactating. (Sexually active adolescent girls will be required to use contraception)
5. Subject with presence of any infection or history of recurrent infection requiring treatment with systemic antibiotics within 2 weeks prior to Screening, or severe infection (e.g. pneumonia, cellulitis, bone or joint infections) requiring hospitalization or treatment with IV antibiotics within 8 weeks prior to Screening
6. Positive human immunodeficiency virus (HIV) test result, hepatitis B surface (HBS) antigen, or hepatitis C virus (HCV) test result