Astrocytomas, a form of brain cancer, account for 25% of all brain cancers. (Fields, R. Douglas, PhD. The Other Brain. p 74-75. NY: Simon & Schuster, 2009.)

The most common form of glial tumors, astrocytomas, most often grow in the frontal lobes. (Schramm, Derek D., PhD. The Creative Brain. p 14-16. CA: Institute for Natural Resources, Health Update. 2007.)