Principles and Practice of Radiation Oncology 2007_Perez , Brady Editors: Halperin, Edward C.; Perez, Carlos A.; Brady, Luther W. Radiation oncology is the discipline of human medicine which addresses the causes, prevention, and treatment of human cancer with special emphasis on the role of ionizing radiation. Approximately 60% of all cancer patients receive radiation therapy as a component of their treatment. According to American Cancer Society estimat ...