RT Book, Section A1 Chan, Yvonne A1 Goddard, John C. SR Print(0) ID 1172372020 T1 Radiation Therapy for Head and Neck Cancer T2 K.J. Lee’s Essential Otolaryngology: Head and Neck Surgery, 12e YR 2019 FD 2019 PB McGraw-Hill Education PP New York, NY SN 9781260122237 LK accesssurgery.mhmedical.com/content.aspx?aid=1172372020 RD 2024/04/25 AB Radiation induced double-strand breaks within DNA kill tumor cells.Normal tissues have a greater ability to repair radiation-induced damage as compared to tumor cells.This difference is exploited in radiation oncology.Radiation is usually given in small daily fractions, given 5 days a week over 6 to 7 weeks.This allows for maximal normal tissue healing.