Edward J. Estlin, BSc (Hons), PhD, MRCP, FRCPCHMacmillan Consultant in Paediatric Oncology, Department of Paediatric Oncology, Royal Manchester Children’s Hospital, Manchester, UK Richard J. Gilbertson, B.Med.Sci (Hons), MRCP, PhDCo-Leader, Neurobiology and Brain Tumor Program; Director, Molecular Clinical Trials Core, Departments of Developmental Neurobiology and Oncology, St Jude Children’s Research Hospital, Memphis, TN, USARobert F. Wynn, BA, MD, MRCP, FRCPathConsultant Paediatric Haematologist and Programme Director, Blood and Marrow Transplant Unit, Royal Manchester Children’s Hospital, Manchester, UK