Engineering Immune Organoids to Study Pediatric Cancer

Inclusion Criteria: * Age at diagnosis ≤ 25 years except for patients with malignant gliomas and renal tumors for whom no upper age limit is applied * Medical suspicion or diagnosis of one of the following diseases, regardless of stage: * Brain tumors * Renal tumors * Neuroblastoma * Sarcomas * Adult patient or parents or guardians should understand, sign and date the appropriate written informed consent from prior to any protocol-specific procedures performed. Patient should be able and willing to comply with study visits and procedures as per protocol. * Affiliated to a social security system or beneficiary of the same. Exclusion Criteria: * Any histology not mentioned in the inclusion criteria * Adult patient or parents/guardians incapable/incapable of giving its/their consent * Patients deprived of their liberty by a judicial or administrative decision