Pediatric Study in Children and Adolescents With Severe Plaque Psoriasis

Depending on weight group subject will receive per dose a) 75 mg if weighing less than 50 kg b) 150 mg if weighing 50 kg or more. Secukinumab injections (one or two per dose, depending on the weight group) will be administered subcutaneously at Randomization, Weeks 1, 2, 3, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, and 48, and Placebo secukinumab at Weeks 13, 14 and 15 during the blinded phase of the study; thereafter at Week 52 and every 4 weeks during the extension treatment period until Week 232.

Depending on weight group subject will receive per dose a) 75 mg if weighing less than 25 kg b) 150 mg if weighing between 25 and less than 50 kg c) 300 mg if weighing more than 50 kg. Secukinumab injections (one or two per dose, depending on the weight group) will be administered subcutaneously at Randomization, Weeks 1, 2, 3, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, and 48, and Placebo secukinumab at Weeks 13, 14 and 15 during the blinded phase of the study; thereafter at Week 52 and every 4 weeks during the extension treatment period until Week 232.

Placebo secukinumab (one or two subcutaneous injections per dose, depending on weight group) at Randomization and Weeks 1, 2, 3 4 and 8. At Week 12, subjects in the placebo group based on their PASI 75 response status at Week 12 will proceed as follows: • PASI 75 responders will discontinue study treatment at Week 12 and enter the treatment-free follow-up period • PASI 75 non-responders will receive high dose or low dose secukinumab, according to the pre-assignment at the Randomization visit. They will receive their treatment based on the weight category(\<25 kg, 25- \<50kg, ≥50 kg), on Weeks 12, 13, 14, 15, and then every four weeks starting at Week 16 until Week 48 during the maintenance period; thereafter at week 52 and every 4 weeks during the extension treatment period until Week 232.

Etanercept 0.8 mg/kg of subject weight and up to a maximum of 50 mg per dose. Subcutaneous etanercept 0.8 mg/kg (one or two injections per dose) once per week, for 51 weeks administered at home (self-injected or by caregiver) or at the study site. At Wk 52 subjects in the etanercept group will move into the treatment-free follow up period and terminate the study.