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The National Registry of Childhood Tumours contains population-based data on childhood cancers diagnosed throughout Great Britain from 1962 onwards. This paper describes the methodology of the Registry, presents incidence rates for 1978-1987 and describes other uses of the data. Total age-standardised annual incidence was 118.3 per million. The most frequent diagnostic groups were leukaemias (age-standardised rate 39.8), brain and spinal tumours (27.0), lymphomas (11.1), sympathetic nervous system tumours (8.3), kidney tumours (7.7) and soft-tissue sarcomas (7.5). Incidence rates were similar to those reported from other Western industrialised countries. The data are also used for a wide range of epidemiological and other studies. These include analyses of geographical variations in incidence, trends in survival, health of long-term survivors and their offspring and the genetics of childhood cancer. Information is frequently provided for clinicians and research workers, and series of specific types of cancer are compiled for further study. The Registry depends for the completeness and accuracy of its data on a wide range of organisations and individuals, and it is essential that this cooperation continues if the Registry is to be maintained.