The International Society of Paediatric Oncology (SIOP) is the only global multidisciplinary society entirely devoted to paediatric and adolescent cancer. The society has over 1800 members worldwide including doctors, nurses, other health-care professionals, scientists and researchers. Our members are dedicated to increasing knowledge about all aspects of childhood cancer. SIOP’s vision is that no child should die of cancer and that cure can be achieved with no or minimal late effects.