A Study of Tildrakizumab in Pediatric Subjects With Chronic Plaque Psoriasis

Inclusion Criteria: * Subject must be 6 to \< 18 years of age, of either sex, of any race/ ethnicity, must weight greater than or equal to 15Kg. * Diagnosis of predominantly plaque psoriasis for ≥6 months (as determined by subject interview and confirmation of diagnosis through physical examination by investigator). * Moderate to severe psoriasis at baseline defined as: at least 10% Body Surface Area (BSA) involvement, PGA score ≥ 3, and PASI score ≥ 12 * Subject must be considered a candidate for systemic therapy and/or phototherapy. * Subject is considered to be eligible according to tuberculosis (TB) screening criteria * 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: * 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 * 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…