The incidence rate of central nervous system tumors in the USA is 14.8/100,000 people per year.1 Within these, the malignant CNS tumors are accountable for at least 12,760 deaths for the year 2005 (1). The CNS tumors incidence in the USA is associated with male gender, Caucasian race, metropolitan area residents, and the elderly population (2). CNS tumor incidence in the USA has been studied an...