Memorial Sloan Kettering Cancer Center - Department of Radiation Oncology, University of Pittsburgh - Hillman Cancer Center, - Section of Medical Oncology, Harvard University - Department of Medical Oncology, National Cancer Center Hospital East, Groupe d'Oncologie Radiothérapie Tête et Cou (GORTEC), NHS Foundation Trust - Royal Marsden Hospital, National Yang Ming University - Taipei Veterans General Hospital, Changhua Christian Hospital - Department of Radiation Oncology, University of Oklahoma - Stephenson Cancer Center, Instituto Português de Oncologia de Coimbra Francisco Gentil, Semmelweis University - Onkológiai Tanszék, Centre Hospitalier Prive Saint Grégoire - CHP Saint Grégoire, Costa del Sol Hospital - Department of Medical Oncology, Fudan University - Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, Budgetary Institution of Healthcare of the Omsk Region - Clinical Oncology Dispensary, Pfizer AG, Pfizer, Inc., Pfizer, Inc. and University of California, San Diego (UCSD) - Moores Cancer Center