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Summary

Cytology screening, used in New Zealand since 1955 at an intensity comparable to that in Canada generally, has not favourably affected incidence and mortality rates for cervical cancer; these have actually risen significantly in 20 to 34-year-old New Zealand women. Canadian claims that mortality falls are related to intensity of cytological screening are not justifiable, so that the significance of the‘pre-cancers’revealed by cytology and the value ofpopulation screening would seem to be doubtful.