The primary objective of this study is to evaluate the efficacy of apremilast in children and adolescents (ages 6 through 17 years) with moderate to severe plaque psoriasis.

Inclusion Criteria:

• Japanese participants aged 6 to 17 years at screening
• Participants must have a weight of ≥ 15 kg
• Diagnosis of chronic plaque psoriasis for at least 3 months prior to screening
• Has moderate to severe plaque psoriasis at screening and baseline as defined by:
• PASI score ≥ 12; and
• BSA ≥ 10; and
• sPGA ≥ 3 (moderate to severe)
• Disease inadequately controlled by or contraindicated for ≥ 1 topical therapy for psoriasis
• Candidate for systemic therapy or phototherapy

Exclusion Criteria:

• Psoriasis flare or rebound within 4 weeks prior to screening
• Evidence of skin conditions, other than psoriasis, that would interfere with clinical assessments
• Other than psoriasis, history of any clinically significant (as determined by the investigator) cardiac, endocrinologic, pulmonary, neurologic, psychiatric, hepatic, renal, hematologic, immunologic disease, or other major uncontrolled disease
• Prior history of suicide attempt at any time in the participant's lifetime prior to screening or baseline in the study, or major psychiatric illness requiring hospitalization within 3 years prior to signing the assent and informed consent
• Guttate, erythrodermic, or pustular psoriasis at screening and baseline

De-identified individual patient data for variables necessary to address the specific research question in an approved data sharing request.

Data sharing requests relating to this study will be considered beginning 18 months after the study has ended and either 1) the product and indication have been granted marketing authorization in both the US and Europe or 2) clinical development for the product and/or indication discontinues and the data will not be submitted to regulatory authorities. There is no end date for eligibility to submit a data sharing request for this study.

Qualified researchers may submit a request containing the research objectives, the Amgen product(s) and Amgen study/studies in scope, endpoints/outcomes of interest, statistical analysis plan, data requirements, publication plan, and qualifications of the researcher(s). In general, Amgen does not grant external requests for individual patient data for the purpose of re-evaluating safety and efficacy issues already addressed in the product labelling. Requests are reviewed by a committee of internal advisors. If not approved, a Data Sharing Independent Review Panel will arbitrate and make the final decision. Upon approval, information necessary to address the research question will be provided under the terms of a data sharing agreement. This may include anonymized individual patient data and/or available supporting documents, containing fragments of analysis code where provided in analysis specifications. Further details are available at the URL below.