This diversity of registration practices is also reflected in
differing systems of data collection. Reporting of cancers to
the national registry is a legal obligation in Sweden, while in
some countries it is voluntary but passive, and others employ
tumour registration staff in active registration of all cancers.
The latter active registration policy exists in Ireland where
state-funded staff actively collect histological data from hospitals,
pathology laboratories and general practitioners, ensuring
comprehensive and accurate data relating to the national incidence
of skin cancer.