The changing pattern of cervical cancer in Northern Ireland 1965-1989.

There was a change in pattern of an increased prevalence of cervical cancer in Northern Ireland from 1965 to 1989, characterised by an increased incidence in women under 40 years. These changes occurred despite special screening of younger women, although the screening programme has probably prevented an even greater increase in incidence of the disease. To reduce the incidence of cervical cancer, not only systematic screening but also cervical smears at more frequent intervals would be required.