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In this retrospective cohort study, the authors compared the 10-year cumulative colorectal cancer (CRC) mortality among patients who complied with diagnostic colonoscopy versus those who did not after a positive faecal immunochemical test (FIT). The cumulative mortality for CRC was 6.8 per 1000 (95% CI, 5.9–7.6) for patients who complied with colonoscopy and 16.0 per 1000 (95% CI, 13.1–18.9) for those who did not. The risk of dying from CRC among noncompliant patients was more than double that of compliant patients (aHR, 2.03; 95% CI, 1.68–2.44).
The results of this study highlight the importance of undergoing colonoscopy after a positive FIT, as well as the need for interventions to engage this high-risk population in order to increase compliance and decrease mortality from CRC.
The risk of colorectal cancer (CRC) among subjects with a positive faecal immunochemical test (FIT) who do not undergo a colonoscopy is unknown. We estimated whether non-compliance with colonoscopy after a positive FIT is associated with increased CRC incidence and mortality.
The FIT-based CRC screening programme in the Veneto region (Italy) invited persons aged 50 to 69 years with a positive FIT (>20 µg Hb/g faeces) for diagnostic colonoscopy at an endoscopic referral centre. In this retrospective cohort study, we compared the 10-year cumulative CRC incidence and mortality among FIT positives who completed a diagnostic colonoscopy within the programme (compliers) and those who did not (non-compliers), using the Kaplan-Meier estimator and Cox-Aalen models.
Some 88 013 patients who were FIT positive complied with colonoscopy (males: 56.1%; aged 50-59 years: 49.1%) while 23 410 did not (males: 54.6%; aged 50-59 years: 44.9%).The 10-year cumulative incidence of CRC was 44.7 per 1000 (95% CI, 43.1 to 46.3) among colonoscopy compliers and 54.3 per 1000 (95% CI, 49.9 to 58.7) in non-compliers, while the cumulative mortality for CRC was 6.8 per 1000 (95% CI, 5.9 to 7.6) and 16.0 per 1000 (95% CI, 13.1 to 18.9), respectively. The risk of dying of CRC among non-compliers was 103% higher than among compliers (adjusted HR, 2.03; 95% CI, 1.68 to 2.44).
The excess risk of CRC death among those not completing colonoscopy after a positive faecal occult blood test should prompt screening programmes to adopt effective interventions to increase compliance in this high-risk population.