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Association between baseline hyperplastic polyps and metachronous serrated lesions.

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Area of Science:

  • Gastroenterology
  • Colorectal Cancer Prevention
  • Endoscopic Surveillance

Background:

  • Current guidelines often do not recommend surveillance colonoscopy for individuals with numerous small (<10-mm) rectosigmoid hyperplastic polyps (HPs).
  • Limited data exist on the risk of metachronous neoplasia associated with small HPs located proximal to the sigmoid colon.

Purpose of the Study:

  • To compare the risk of metachronous neoplasia in patients with small HPs versus those with normal colonoscopies.
  • To investigate the impact of HP location (proximal vs. distal) and number on the risk of developing future colorectal neoplasia.

Main Methods:

  • Retrospective review of colonoscopy and pathology reports from 1795 patients undergoing at least two colonoscopies between 2004 and 2014.
  • Exclusion criteria included specific age ranges, inpatient status, and history of colorectal cancer, IBD, previous surgery, or polyps/lesions (adenoma, SSL, HP ≥10 mm) on prior exams.
  • Risk of metachronous neoplasia (adenomas and SSLs) was compared between patients with normal index colonoscopies and those with <10-mm HPs, stratified by location and number.

Main Results:

  • Patients with small proximal or distal hyperplastic polyps (<10 mm) showed a significantly increased risk of metachronous sessile serrated lesions (SSLs).
  • The odds ratio for metachronous SSLs was 3.82 for proximal HPs and 2.23 for distal HPs, compared to normal colonoscopies.
  • No increased risk of metachronous adenomas was observed in patients with small HPs.

Conclusions:

  • Small hyperplastic polyps (HPs), regardless of location (proximal or distal), are associated with an elevated risk of developing metachronous sessile serrated lesions (SSLs).
  • These findings suggest that current surveillance recommendations for patients with small HPs may need revision.
  • Further research in larger cohorts is warranted to confirm these preliminary findings and refine surveillance strategies.