A nurse is explaining the principles of radiation therapy to a patient. Which statement should the nurse include in the teaching?
1
"Radiotherapy uses high-energy particles to treat cancers, and it only affects cancer cells."
2
"Radiotherapy is typically given in one large dose and has minimal side effects."
3
"Radiotherapy may be given externally or internally and can be used in combination with other treatments."
4
"Radiotherapy is not effective for treating tumors in areas that are difficult to reach."