Support WBURJohn McCain Was Diagnosed With A Glioblastoma, Among The Deadliest Of CancersPlay03:12Download AudioJon HamiltonJuly 20, 2017 ShareGlioblastomas are the most common malignant brain tumor. About 12,000 people in the U.S. are diagnosed with the cancer every year. (Sherbrooke Connectivity Imaging Lab/Science Source)
