One task of the Mass Screening Registry is to evaluate cancer screenings. Population-based screenings are based on the effectiveness of reliable evidence. In addition, the downsides of screening, its costs and its impact on the quality of life are studied. (See section on research)

The Mass Screening Registry evaluates not only the existing screening programmes, but also updates them and monitors new cancer screening evidence (See Cancer in Finland). If necessary, the Mass Screening Registry plans and implements new screening programmes.

The effect of screening on cancer morbidity and mortality can be investigated by combining screening data with information from the Finnish Cancer Registry. Using registry information it has been possible, for instance, to reliably investigate the effect of screening on the decline in breast cancer mortality.