Malignant primary brain tumors cause more than 15 000 deaths annually in the US. JAMA Fishbein Fellow Revital Marcus, MD, interviews Ingo Mellinghoff, MD, PhD, neuro-oncologist and chair of the department of neurology at Memorial Sloan Kettering Cancer Center in New York, about the epidemiology, diagnosis, and treatment of various primary malignant brain tumors in adults. Related Content: Glioblastoma and Other Primary Brain Malignancies in Adults