1. From INSERM Unité 830, Unité de Génétique Somatique, and Departments of Pediatrics and Pathology, Institut Curie; Programme Cartes d'Identité des Tumeurs, Ligue Nationale Contre le Cancer, Paris; Department of Pediatric and Adolescent Oncology, Institut Gustave Roussy, Villejuif, France; Molecular Cytogenetics and Paediatric Oncology, The Institute of Cancer Research, Sutton, Surrey, United Kingdom.