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Endoscopy
DOI: 10.1055/a-2463-1737
Original article

Association between colonoscopy and colorectal cancer occurrence and mortality in the older population: a population-based cohort study

Ji Young Lee
1   Health Screening and Promotion Center, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea (the Republic of)
,
Jae Myung Cha
2   Department of Internal Medicine, Kyung Hee University Hospital at Gang Dong, College of Medicine, Kyung Hee University, Seoul, Korea (the Republic of)
,
Jin Young Yoon
2   Department of Internal Medicine, Kyung Hee University Hospital at Gang Dong, College of Medicine, Kyung Hee University, Seoul, Korea (the Republic of)
,
Min Seob Kwak
2   Department of Internal Medicine, Kyung Hee University Hospital at Gang Dong, College of Medicine, Kyung Hee University, Seoul, Korea (the Republic of)
,
Hun Hee Lee
3   Big Data Center, Kyung Hee University Hospital at Gang Dong, Seoul, Korea (the Republic of)
› Author AffiliationsSupported by: Research Supporting Program of the Korean Association for the Study of Intestinal Diseases for 2021
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Abstract

Background

We aimed to evaluate the association between colonoscopy and colorectal cancer (CRC) occurrence and related mortality in an older population.

Methods

This retrospective, nationwide, population-based cohort study used data of adults aged ≥40 years from the Health Insurance Review and Assessment Service database. After excluding colonoscopy within 6 months of CRC diagnosis during enrollment, CRC occurrence and related mortality were compared between colonoscopy and non-colonoscopy groups using a time-dependent Cox proportional hazard model. Subgroup analysis was conducted among four age groups: young, middle-aged, old, and very old.

Results

Among 748986 individuals followed for 9.64 (SD 0.99) years, the colonoscopy group had a 65% lower CRC occurrence (adjusted hazard ratio [HRa] 0.35, 95%CI 0.32–0.38) and 76% lower CRC-related mortality (HRa 0.24, 95%CI 0.18–0.31) after 5 years compared with the non-colonoscopy group. Colonoscopy was associated with the most significant reduction in CRC occurrence in the middle-aged group (HRa 0.32, 95%CI 0.29–0.35) and in CRC-related mortality in the young group (HRa 0.04, 95%CI 0.01–0.33); the very old group had the least reduction in both CRC occurrence and CRC-related mortality (HRa 0.44, 95%CI 0.33–0.59 and HRa 0.28, 95%CI 0.15–0.53, respectively).

Conclusion

We found a significant association between colonoscopy and reduction in CRC occurrence and CRC-related mortality in adults aged ≥40 years after 5 years of follow-up; however, these associations were weaker in the very old group. More research is needed on the association between colonoscopy and older age.

Supplementary Material



Publication History

Received: 19 March 2024

Accepted after revision: 06 November 2024

Accepted Manuscript online:
06 November 2024

Article published online:
10 January 2025

© 2025. Thieme. All rights reserved.

Georg Thieme Verlag KG
Oswald-Hesse-Straße 50, 70469 Stuttgart, Germany

 

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