Abstract
Purpose
To clarify how often postoperative surveillance colonoscopy should be undertaken based on the risk factors for the development of metachronous cancer (MC) and advanced adenoma (AA) after surgery for colorectal cancer.
Methods
We collected data of consecutive patients who underwent curative resection for primary colorectal cancer between 2005 and 2012, with preoperative colonoscopy and surveillance colonoscopy at 1 year after surgery (406 patients, mean age: 69 years, 59% male). The detection rates of AA (with villous features, > 10 mm or high-grade dysplasia) and MC by surveillance colonoscopy were the primary outcomes.
Results
At 5 years, colonoscopy was performed as postoperative surveillance an average of 3.2 times. AA and MC were detected in 57 (14.0%) and 18 patients (4.4%), respectively. Both lesions were more common in the right colon (n = 43) than in the left colon (n = 28). The detection rate did not differ to a statistically significant extent according to the number of colonoscopies performed for surveillance (p = 0.21). However, after left-sided colectomy, both types of lesions were more commonly detected in those who received ≥ 3 colonoscopies than in those with one or two colonoscopies (p = 0.04).
Conclusion
A remaining right colon after left-sided colectomy was associated with a higher risk of develo** AA and MC. Physicians should consider performing surveillance colonoscopy more frequently if the right colon remains after surgery.
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Mitsuru Yokota and other co-authors declare no conflicts of interest in association with the present study.
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Yokota, M., Muto, J., Hashida, K. et al. The necessity of intensive surveillance colonoscopy for patients with a remaining right colon after resection of colorectal cancer: a retrospective cohort study. Surg Today 52, 502–509 (2022). https://doi.org/10.1007/s00595-021-02372-9
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DOI: https://doi.org/10.1007/s00595-021-02372-9