Bevacizumab and Radiation Therapy for Sarcomas

* The dose of bevacizumab and radiation therapy will be the same for all participants throughout the study. * Bevacizumab will be given as an intravenous infusion every 2 weeks for a total of 4 doses. * Radiation therapy will begin 2 weeks after the first bevacizumab infusion and will be delivered 5 days per week over a period of 6 weeks. This is done as an outpatient procedure. Each 2 week period will be considered a separate treatment cycle. Participants will be treated with radiation therapy for a maximum of 3 cycles (6 weeks). * A surgeon will evaluate the participants tumor by radiologic studies before study treatment to determine if surgical removal is possible. After the completion of study treatment, a surgeon will repeat the evaluation of the tumor. Surgery will performed 6-7 weeks after the completion of radiation therapy.