Doctors treating Gary Carter have confirmed that he has glioblastoma, a form of cancer which affects the brain and central nervous system. Doctors say surgery "is not a good option given the location of the tumor." Instead of surgery, the doctors have discussed an "aggressive" treatment plan, including chemotherapy and radiation. "Mr. Carter's youth, strong physical condition and fighting spirit will be to his advantage as his treatment commences," Dr. Allan H. Friedman and Dr. Henry S. Friedman, co-deputy directors of the Preston Robert Tisch Brain Tumor Center at Duke said in a statement Tuesday.