For the majority of cancer patients, radiotherapy is a crucial component of their treatment process. However, many patients experience anxiety before or during radiotherapy. This anxiety may be related not only to the cancer diagnosis and its prognosis, but also to unfamiliar aspects of the treatment process, equipment, and treatment environment. General or non-specific feelings of anxiety may also become associated with the radiotherapy setting, even when patients are not able to identify a specific treatment-related concern. Uncertainty about what will happen during treatment sessions can further increase anxiety and may affect patients' overall well-being.

This study investigates whether an additional simulation-based patient education session before radiotherapy improves patients' understanding of their treatment and reduces radiotherapy-related state anxiety. Participants receiving radiotherapy will be assigned by chance to one of two groups. All participants will receive the usual patient education provided before radiotherapy. In addition, participants in one group will receive the simulation-based education session before the beginning of the treatment process. The study will compare changes in radiotherapy-related state anxiety and health-related quality of life between the two groups. It will also assess whether the additional education session is feasible, well accepted, and practical to provide as part of routine radiotherapy care.