The treatment is usually given once a day from Monday to Friday with a rest over the weekend. However, it can be given in other amounts, such as a single treatment as a course of five treatments each week for a number of weeks. Radiation therapy is not a systemic therapy. It is a localized therapy, thereby affecting cells only in the treated area. Radiation from high-energy rays is used to destroy cancer cells and shrink tumors during radiation therapy.
Radiation therapy is available in two ways, either externally or internally.