Study Combining Dinutuximab Beta With Two Chemotherapy Regimens in Neuroblastoma

The goal of this clinical trial is to to assess the dose level of dinutuximab Beta (DB) when combined with 2 different induction chemotherapy regimens (named GPOH or rapid COJEC) in newly diagnosed high-risk neuroblastoma patients. The main question is: • to assess the safety and tolerability and identifying the recommended phase II dose and/or the maximum tolerable dose of dinutiximab Beta when combined with 2 standard induction chemotherapy regimens Participants will receive: * GPOH + dinutuximab beta infusion duration = 10 mg/m2 × 5 days (50 mg/m2/course) in 21-day treatment intervals. * Rapid COJEC + dinutuximab beta infusion duration = 10 mg/m2 × 3 days (30 mg/m2/course) in 10-day treatment intervals.