RecruitingClinical trialWeb-Based Application for Monitoring Radiation Therapy Complications in Cancer PatientsCancer treatment is multidisciplinary and may include radiotherapy. Treatment-related complications represent a burden for patients and the healthcare system. Early recognition of radiotherapy-related side effects is important for timely clinical interventions and improved quality of care. This study aims to improve comprehensive patient management during and after radiotherapy through development and implementation of a web-based application using standardized electronic patient-reported outcome questionnaires (PROMs). Patients will report radiotherapy-related symptoms and quality of life through web-based questionnaires that will be securely transmitted to the Institute of Oncology Ljubljana for review by healthcare professionals. Responses will be categorized using a traffic-light system to guide clinical actions and optimize follow-up visits.