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The Puerto Rico and New York State tumor registries: problems associated with the use of cancer incidence data in migrant studies.

This paper discusses specific problems pertaining to compatibility of data between the Puerto Rico and New York State tumor registries, which is applicable to other studies comparing cancer incidence rates from two distinct tumor registries. Discrepancies in the data between the two tumor registries were due to differences in quality control, under and overreporting of cancer cases, reliability indicators, and case criteria. A study comparing stomach cancer incidence rates between Puerto Rico and Puerto Rican migrants to New York City provided the foundation for this investigation.