The influence of the surveillance time interval on the risk of advanced neoplasia after non-advanced adenoma removal

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Abstract

Objectives: To investigate the incidence of advanced neoplasia (colorectal cancer or advanced adenoma) at surveillance colonoscopy following removal of non-advanced adenoma; to determine whether the time interval before surveillance colonoscopy influences the likelihood of advanced neoplasia. Design: Retrospective cohort study. Setting, participants: Patients enrolled in a South Australian surveillance colonoscopy program with findings of non-advanced adenoma during 1999–2016 who subsequently underwent surveillance colonoscopy. Main outcome measures: Incidence of advanced neoplasia at follow-up surveillance colonoscopy. Results: Advanced neoplasia was detected in 169 of 965 eligible surveillance colonoscopies (18%) for 904 unique patients (median age, 62.0 years; interquartile range [IQR], 54.0–69.0 years), of whom 570 were men (59.1%). The median interval between the initial and surveillance procedures was 5.2 years (IQR, 4.4–6.0 years; range, 2.0–14 years). Factors associated with increased risk of advanced neoplasia at follow-up included age (per year: odds ratio [OR], 1.03; 95% CI, 1.01–1.05), prior history of adenoma (OR, 1.48; 95% CI, 1.01–2.15), two non-advanced adenomas identified at baseline procedure (v one: OR, 1.74; 95% CI, 1.18–2.57), and time to surveillance colonoscopy (OR, 1.21; 95% CI, 1.08–1.37). The estimated incidence of advanced neoplasia was 19% five years after non-advanced adenoma removal, and 30% at ten years. Conclusions: Increasing the surveillance colonoscopy interval beyond five years after removal of non-advanced adenoma increases the risk of detection of advanced neoplasia at follow-up colonoscopy.

Original languageEnglish
Number of pages6
JournalMedical Journal of Australia
DOIs
Publication statusE-pub ahead of print - 12 Aug 2021

Keywords

  • Colonoscopy
  • Colorectal neoplasms
  • Early detection of cancer
  • Surveillance

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