Dr Mark Porter visits the radiotherapy department at University College London Hospital, to discuss the latest developments in using radiation to treat cancer. He talks to doctors, radiographers and patients about the modern practice and experience of harnessing radiation to kill malignant tumours. Radiotherapy is sometimes described as the 'Cinderella' of cancer treatment. Its public profile is lower than the new generation of anti-cancer drugs. Yet doctors are continually finding ways of improving its effectiveness and accuracy.