The study consists of the following: 1) a screening period of up to 28 days; 2) a treatment period of radiation with daily temozolomide that lasts approximately 6 weeks, 3) a study treatment period that will last until either your tumor grows or you experience unacceptable side effects; and 4) a 30-day follow-up period after treatment has ended. Additionally, basic information concerning your condition will be collected every 2 months after the follow-up period for the rest of your life.