AB136. SOH25_AB_027. Evaluating the oncological value of extended colorectal cancer surveillance after 5 years: a single-centre retrospective cohort study
Colorectal Session

AB136. SOH25_AB_027. Evaluating the oncological value of extended colorectal cancer surveillance after 5 years: a single-centre retrospective cohort study

Elise Pyne1, Matthew Davey2, William Joyce2

1Department of Surgery, Galway Clinic, Galway, Ireland; 2Department of Surgery, Royal College of Surgeons in Ireland, Dublin, Ireland

Background: The American Society of Colon and Rectal Surgeons (ASCRS) recommends surveillance for 5-year following colorectal cancer (CRC) resection. The oncological value of extended surveillance following CRC surgery remains controversial. This study aims to record the incidence of polyps, metachronous tumours or other pathologies and thus evaluate the value of CRC surveillance beyond standard 5-year period.

Methods: A retrospective cohort study was performed. Patients who underwent curative surgery for CRC between 2004 and 2023 with endoscopic and computed tomography (CT) surveillance were identified from a prospectively maintained database. A comprehensive review of electronic medical, endoscopic, and radiological records was performed. Descriptive statistics and Kaplan-Meier analysis were performed using SPSS v26.0.

Results: Overall, 217 patients were included, with mean age of 66 years (range, 28–93 years). The mean follow-up was 59.8 months. The overall incidence of polyps, metachronous tumours and distant metastasis discovered during surveillance were 17.6% (33/188), 7.4% (14/189), and 26.3% (47/179), respectively. Of these, 14.3% diagnosed with metachronous tumours were diagnosed after 5-year surveillance (2/14), as did 8.5% of those who developed distant recurrence (4/47). Furthermore, 33.3% of polyps were detected after 5-year surveillance (11/33). Kaplan-Meier analyses demonstrated a significant difference in survival when metachronous tumours and distant metastases were diagnosed after 5-year surveillance.

Conclusions: The current study challenges current ASCRS surveillance guidelines, suggesting CRC surveillance may be warranted beyond the standard 5-year follow-up. The provision of well-designed, prospective randomised clinical trials may further ratify these results.

Keywords: Colorectal cancer (CRC); distant metastasis; metachronous tumours; polyps; surveillance

Acknowledgments

None.

Footnote

Funding: None.

Conflicts of Interest: The authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.

doi: 10.21037/map-25-ab136
Cite this abstract as: Pyne E, Davey M, Joyce W. AB136. SOH25_AB_027. Evaluating the oncological value of extended colorectal cancer surveillance after 5 years: a single-centre retrospective cohort study. Mesentery Peritoneum 2025;9:AB136.

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