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Endoscopy 2021; 53(10): 1023-1033
DOI: 10.1055/a-1322-6574
Original article

Risk of a post-colonoscopy colorectal cancer diagnosis in patients with inflammatory bowel disease: a population-based cohort study

Frederikke Schønfeldt Troelsen 
1   Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
,
Henrik Toft Sørensen
1   Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
2   Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts, USA
,
Lars Pedersen
1   Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
,
Rune Erichsen
1   Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
› InstitutsangabenGefördert durch: Aarhus University, Kræftens Bekæmpelse R247-A14719
Gefördert durch: Novo Nordisk Fonden NNF19OC0058609
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Einführung zu diesem Artikel:

Interpreting post-colonoscopy colorectal cancer rates in inflammatory bowel diseaseEndoscopy 2021; 53(10): 1034-1036
DOI: 10.1055/a-1395-7536

Abstract

Background Post-colonoscopy colorectal cancers (PCCRCs) may account for up to 50 % of all colorectal cancers (CRCs) diagnosed in patients with inflammatory bowel disease (IBD). This may reflect a high colonoscopy frequency; however, evidence remains limited.

Methods We conducted a cohort study of IBD and non-IBD patients undergoing colonoscopy. We calculated cumulative incidence proportions (CIPs) of PCCRC at 7–36 months after first-time and subsequent colonoscopies. We also computed crude and adjusted hazard ratios (HRs) of PCCRC, comparing IBD with non-IBD patients undergoing first-time and subsequent colonoscopies. Separate analyses were conducted for consecutive colonoscopies. We calculated 3-year rates of PCCRC to estimate the proportion of IBD and non-IBD CRC patients experiencing PCCRC.

Results We observed 138 and 1909 PCCRCs among 34 688 IBD and 358 217 non-IBD patients who underwent colonoscopy. The CIP of PCCRC after first-time colonoscopy was 0.21 % (95 % confidence interval [CI] 0.17 %–0.27 %) for IBD patients and 0.37 % (95 %CI 0.35 %–0.39 %) for non-IBD patients. The adjusted HR of PCCRC after a first-time colonoscopy was 0.96 (95 %CI 0.75–1.22) and the adjusted HRs after subsequent colonoscopies had point estimates around 1.0. The 3-year PCCRC rate was 24.3 % (95 %CI 20.4 %–28.7 %) for IBD and 7.5 % (95 %CI 7.2 %–7.8 %) for non-IBD patients.

Conclusions Although PCCRCs accounted for a substantial proportion of all IBD-related CRCs, IBD patients had a low CIP of PCCRC. The elevated 3-year PCCRC rates may, among other factors, stem from the increased colonoscopy frequency in IBD patients.

Figs. 1s–2s, Tables 1s–18s



Publikationsverlauf

Eingereicht: 03. Juli 2020

Angenommen nach Revision: 25. November 2020

Accepted Manuscript online:
25. November 2020

Artikel online veröffentlicht:
18. Februar 2021

© 2020. Thieme. All rights reserved.

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

Einführung zu:

Author commentary on Frederikke Schønfeldt Troelsen et al.Endoscopy 2021; 53(10): v49-v49
DOI: 10.1055/a-1379-6400

 

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