The Childhood Cancer Registry (ChCR) is a national registry that records cancer in children and adolescents. It records new cases and data about the entire course of the disease and its treatment. The Cancer Registration Act (in effect from January 2020) binds doctors and hospitals to report all cases of cancer diagnosed and treated in children and adolescents under 20 years of age to the Childhood Cancer Registry. Registration that is as complete as possible enables reliable conclusions to be drawn about the development of different types of cancer, their course and about the efficacy of treatments.