Alongside the EORTC scientific and clinical programme, the EORTC collaborates with a number of international organisations, including the US National Cancer Institute, National Cancer Institute Canada, and other countrywide groups. Also a number of academic societies such as European Society for Therapeutic Radiation Oncology, European Society of Surgical Oncology, European Society of Medical Oncology and European Society of Paediatric Oncology. In order to follow changing regulatory requirements, the EORTC regularly converses with the US Food and Drug Administration and the European Medicines Evaluation Agency.