If you are found to be eligible to take part in this study, you will receive 37 treatments of proton radiotherapy (Monday through Friday for 7 1/2 weeks). During the treatment, you will lie still on a table for about 30-45 minutes per day in the same position. The proton machine will deliver the dose according to the plan designed by the physician and controlled by a computer. You will not feel, see, or smell anything during the proton beam delivery. While on study, you will also be receiving weekly standard low-dose chemotherapy possibly followed by full-dose chemotherapy.