The Danish Cancer Registry was founded in 1942. The Cancer Registry contains data on the incidence of cancer in the Danish population since 1943. Validity of the Cancer Registry is secured by the application of manual quality control routines in the daily production of the Cancer Registry, the application of the automated cancer logic, and the use of multiple notifications from different data sources, which also secures a high degree of completeness. In 2008 the Cancer Registry finished a process of modernisation where reporting became electronic through integration with the patient administrative systems and manual coding was partly replaced by an automatic coding logic.