The Investigators at MGH are committed to improving the delivery of radiotherapy to our patients and improving the outcome for these patients. MGH has an on-site cyclotron for proton radiotherapy in order to provide the most advanced care for patients in need. Proton therapy possesses a clinical advantage over standard photon therapy in that its optimal dose distribution delivers the bulk of radiation to the tumor site. This method spares the greatest volume of normal tissue, resulting in decreased short-term and long-term morbidity.