This clinical trial is focused on studying the effects of two treatments for moderate to severe plaque psoriasis in children and teenagers aged 6 to less than 18 years. Plaque psoriasis is a skin condition that causes red, scaly patches on the skin. The study will compare the effectiveness and safety of two medications: bimekizumab and ustekinumab. Bimekizumab, also known by its code name UCB4940, and ustekinumab are both given as a solution for injection under the skin.
The purpose of the study is to evaluate how well bimekizumab works compared to ustekinumab in treating children and adolescents with this condition. Participants will receive either bimekizumab, ustekinumab, or a placebo, which is a substance with no active medication. The study will last for a period of time, during which participants will receive regular injections and attend follow-up visits to monitor their progress and any side effects.
Throughout the study, doctors will assess the improvement in the skin condition using specific measures, such as the Psoriasis Area and Severity Index (PASI) and the Investigator’s Global Assessment (IGA). These assessments will help determine the effectiveness of the treatments. The study will also monitor any changes in the participants’ overall health, including growth and quality of life, to ensure the safety of the treatments being tested.



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