Organised vs. spontaneous pap-smear screening for cervical cancer: A case-control study

To compare the effect of organised pap-smear screening for cervical cancer with that of the spontaneous one on the incidence of invasive cervical canc er, we performed a case-control study within the catchment area of the Hels inki University Hospital (Helsinki, Finland). The study material consisted of 179 incident cases of invasive cervical cancer and 1,507 population cont rols. Data an lifetime pap smears before the year of the cancer diagnosis w ere collected using a self-administered questionnaire. The questionnaire in formation was obtained for 82% of the cases and 73% of the controls. The ma in outcome measure was relative risk of invasive cervical cancer among thos e with history of organised or spontaneous screening compared with risk amo ng those with no history of screening for cervical cancer, measured as odds ratios (OR) with 95% confidence intervals (CI) and computed with logistic regression. Odds ratio of invasive cervical cancer among those who particip ated in the organised screening programme was 0.38 (CI 0.26-0.56) whereas a ny lifetime spontaneous pap smear had an OR value of 0.82 (CI 0.53-1.26), i n terms of unit risk for those not subjected to any screening and adjusted for age and the other type of the screening activity. Our results indicate that the substantial decrease in the incidence of and mortality due to cerv ical cancer in Finland is mainly due to the organised mass-screening. (C) 1 999 Wiley-Liss, Inc.