Interval cancers in a guaiac-based colorectal cancer screening programme: Consequences on sensitivity
2017
ObjectiveTo evaluate interval cancers in the population-based colorectal cancer screening programme of Stockholm/Gotland, Sweden.MethodsFrom 2008, individuals aged 60–69 were invited to colorectal cancer screening using biennial guaiac-based faecal occult blood test (Hemoccult®). Interval cancers, defined as colorectal cancer among participants not diagnosed by the screening programme but registered in the Swedish cancer register, were evaluated by cross-checking the screening histories for all cancers in the region 2008–2012.ResultsOf 203,848 individuals from nine different birth cohorts who participated (∼60%), 4530 (2.2%) tested positive. All invited individuals were followed up for 24 months after invitation. The cancer register reported 557 colorectal cancer, 219 (39.3%) screen-detected cancers and 338 (60.7%) interval cancers, generating both test- and episode sensitivities of approximately 40% and an interval cancer-rate of 17.1/10,000 tests. Among individuals with positive tests without colorectal...
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