1. Department of Pathology Necker‐Enfants Malades Hospital Paris France
2. Assistance Publique ‐ Hôpitaux de Paris Paris France
3. Sorbonne Université Paris France
4. Department of Histology, Embryology and Cytogenetics Necker‐Enfants Malades Hospital Paris France
5. Université de Paris Paris France
6. Department of Biopathology Centre Léon Bérard Lyon France
7. Cancer Research Center of Lyon CRCL Lyon UniversityClaude Bernard University Lyon 1INSERM 1052CNRS 5286 Lyon France
8. SIREDO Oncology Center (Care, Innovation and Research for Children and AYA with Cancer) Institut Curie PSL Research University Paris France