Glioblastoma (GBM) represents 47.1% of malignant primary brain tumors, making it the most common type of malignant primary brain tumor 1).
Incidence of primary central nervous system lymphoma (PCNSL) in the U.S.: 0.44 per 100,000, making it the third most common of malignant primary brain tumors (behind GBM & diffuse astrocytoma) 2).