[Kummar S] Stanford Cancer Center, Stanford University, Palo Alto, California, USA. [Shen L] Department of Gastrointestinal Oncology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital and Institute, Beijing, China. [Hong DS] The University of Texas MD Anderson Cancer Center, Houston, Texas, USA. [McDermott R] St. Vincent’s University Hospital and Cancer Trials Ireland, Dublin, Ireland. [Keedy VL] Vanderbilt University Medical Center, Nashville, Tennessee, USA. [Casanova M] Paediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy. [Gallego Melcón S] Servei d’Hematologia i Oncologia Pediàtriques, Vall d’Hebron Hospital Universitari, Barcelona, Spain