Randomised controlled trial of faecal-occult-blood screening for colorectal cancer

Lancet
J D HardcastleC M Mangham

Abstract

There is growing evidence that faecal-occult-blood (FOB) screening may reduce colorectal cancer (CRC) mortality, but this reduction in CRC mortality has not been shown in an unselected population-based randomised controlled trial. The aim of this study was to assess the effect of FOB screening on CRC mortality in such a setting. Between February, 1981, and January, 1991, 152,850 people aged 45-74 years who lived in the Nottingham area of the UK were recruited to our study. Participants were randomly allocated FOB screening (76,466) or no screening (controls; 76,384). Controls were not told about the study and received no intervention. Screening-group participants were sent a Haemoccult FOB test kit with instructions from their family doctor. FOB tests were not rehydrated and dietary restrictions were imposed only for retesting borderline results. Individuals with negative FOB tests at the first screening, together with those who tested positive but in whom no neoplasia was found on colonoscopy, were invited to take part in further screening every 2 years. Screening was stopped in February, 1995, by which time screening-group participants had been offered FOB tests between three and six times. Screening-group participants who ha...Continue Reading

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