Radiation Therapy to Treat Musculoskeletal Tumors

Inclusion Criteria: * Age less than or equal to 25 years (new enrollments only). No age limit on participants who reconsent or reenroll. * Musculoskeletal tumor involving the primary site of origin requiring definitive, pre-operative or post-operative irradiation to that primary site. * No prior therapeutic irradiation at the primary site except for emergent radiation to the primary site lasting 1 week or less (5 treatment days) that can be dosimetrically accounted for in the analysis. * Negative serum or urine beta-HCG for females of child bearing age. * Patients will be stratified into 2 groups for evaluation of secondary objective endpoints based on the absence or presence of metastatic disease. * Patients may enter this study in specific clinical situations often defined by multimodality protocols that include the use of radiation therapy, including irradiation alone or combined with surgery (following surgical resection that may be macroscopically complete or incomplete, with positive or negative histologic margins) and/or chemotherapy (following neoadjuvant chemotherapy or combined with post-irradiation adjuvant chemotherapy).Patients requiring regional nodal irradiation and/or metastatic site irradiation are allowed as long as the primary site requires radiation.Patients with recurrent tumors or second malignant neoplasms are allowed on this study if the current primary tumor site requiring irradiation has not previously been irradiated. The treatment plan detailed in…