<p> Aims and intended learning outcomes </p> <p>Radiotherapy has been used as a treatment modality for cancer patients since 1895 (Holmes 1988). The aim of this article is to explain the use of radiotherapy, highlight the importance of the nurse’s role in caring for radiotherapy patients and to discuss some of the more common side- effects of treatment. After reading this article you should be able to:</p> ■ <p>Understand the principles of radiotherapy</p> ■ <p>Understand the main methods of delivering radiotherapy</p> ■ <p>Develop your understanding of the side-effects of radiotherapy</p> ■ <p>Be aware of the importance of patient education</p> ■ <p>Increase your awareness of the nurse's role in radiation oncology.</p>