Clinical and Therapeutic Impact of Large Genomic Studies at Diagnosis in Pediatric Solid Cancers

Inclusion criteria * Patients of pediatric age up to 22 years included at the time of molecular analysis * Histological carcinological diagnosis performed at HUS * Carcinological follow-up performed at HUS * Patients with a solid tumor of unfavorable prognosis, refractory or in relapse * Molecular analysis performed on tumor or blood samples * Adult patients who do not object to the re-use of their personal data for medical research purposes * Minor patients and their parents who do not object to the re-use of their personal data for scientific research purposes. Criteria for non-inclusion * Molecular biology results not usable due to poor sample quality or insufficient genetic material * Patients who have expressed their opposition to participate in the study * Parental authority holders who have expressed their opposition to participate in the study