1 Mei-Yin C. Polley, PhD, NRG Oncology Statistics and Data Management Center, Philadelphia, PA; Thierry Gorlia, PhD, EORTC, Brussels, Belgium; Andy B. Lassman, MD, Division of Neuro-Oncology, Department of Neurology, Columbia University Vagelos College of Physicians and Surgeons, Herbert Irving Comprehensive Cancer Center, NewYork-Presbyterian Hospital, New York, NY; and Martin J. van den Bent, MD, Department of Neurology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands.