With data starting from 1999 and around 500,000 cancer patients being added each year, the population-based cancer registries in each German federal state transfer data to the German Centre for Cancer Registry Data (ZfKD). ZfKD estimates national cancer incidence, prevalence and survival rates after assessing the completeness of the data recorded in the individual registries. The basic method is that the data are first checked for completeness of incidence and of vital status. Then, data from registries that meet certain predefined criteria are used to calculate the corresponding statistics for Germany.
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