International Journal of Epidemiology, Vol 28, 386-390, Copyright © 1999 by International Epidemiological Association
SM Moss, JD Hardcastle, DA Coleman, MH Robinson and VC Rodrigues
BACKGROUND: The sensitivity of unhydrated Haemoccult II has been examined
in the context of a randomized controlled trial of faecal occult blood
screening for colorectal cancer in Nottingham, UK. METHOD: Both traditional
and proportional incidence methods were used to calculate sensitivity
separately for both sexes, for two age groups at entry to the trial, for
first screen and repeat screens and for three subsites within the large
bowel. RESULTS: The traditional method of estimation yielded a sensitivity
of 59% whereas the corresponding figure obtained using the proportional
incidence method was 54%. The difference between the estimates using the
two methods was greatest in subjects aged > or = 65 at entry to the
trial and in cancers of the distal colon. CONCLUSIONS: The results suggest
that there may be a higher proportion of slower growing tumours in subjects
aged > or = 65 and that cancers occurring in the distal colon may have a
longer mean sojourn time than cancers proximal to the sigmoid colon.
ARTICLES
Interval cancers in a randomized controlled trial of screening for colorectal cancer using a faecal occult blood test
Cancer Screening Evaluation Unit, Institute of Cancer Research, Surrey, UK.
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