A Double-blind, Randomized, Placebo-controlled Trial to Evaluate the Efficacy, Pharmacokinetics and Safety of Remibrutinib (LOU064) for 24 Weeks in Adolescents From 12 to Less Than 18 Years of Age With Chronic Spontaneous Urticaria Inadequately Controlled by H1-antihistamines Followed by an Optional Open-label Extension for up to Another 3 Years and an Optional Safety Long-term Treatment-free Follow-up Period for up to an Additional 3 Years
The purpose of this trial is: 1. to assess the efficacy, pharmacokinetics, and safety of remibrutinib vs. placebo in adolescents from 12 to \< 18 years of age suffering from chronic spontaneous urticaria inadequately controlled by H1-antihistamines 2. to collect long-term efficacy, safety and tolerability data on remibrutinib in adolescents after having completed 24 weeks of treatment 3. to collect safety data in this population for up to three years after the last dose of study treatment
• Male and female adolescent participants aged \>= 12 to \< 18 years of age at the time of signing the informed consent
• CSU duration for \>= 6 months prior to screening (defined as the onset of CSU determined by the investigator based on all available supporting documentation)
• Diagnosis of CSU inadequately controlled by second-generation H1-AH at the time of randomization defined as:
• The presence of itch and hives for ≥ 6 consecutive weeks prior to screening despite the use of second-generation H1-AH during this time period according to local treatment guidelines
• UAS7 score (range 0 - 42) \>= 16, ISS7 score (range 0 - 21) \>= 6 and HSS7 score (range 0 - 21) \>= 6 during the 7 days prior to randomization (Day 1)
• Documentation of hives within three months before randomization (either at screening and/or at randomization; or documented in the participants' medical history)