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Missed Follow-Up colonoscopies: do they raise the risk of advanced growths?

NCT ID NCT05355363

Knowledge-focused Sponsor: Centre hospitalier de l'Université de Montréal (CHUM) Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 18, 2026 · Last updated Sep 18, 2026

Summary

Researchers are studying whether delays in follow-up colonoscopies after certain polyp findings raise the risk of advanced growths or colorectal cancer. The study looks at medical records of adults aged 45 to 80 who had serrated lesions or high-grade dysplasia found during a colonoscopy at a Montreal hospital between 2009 and 2022, and who did not receive follow-up within the recommended time. By comparing outcomes, the team aims to understand how gaps in care affect the risk of later advanced neoplasia.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If delayed follow-up raises the risk of advanced growths, the findings could support stricter scheduling and reminders for people with serrated lesions or high-grade dysplasia.
What could go wrong
This is a retrospective review of past records, so it can show links but not prove cause and effect. The results may not apply to other hospitals or to people with different polyp types.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

727 people

The number who actually took part.

Started

Feb 2023

Finished

Dec 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

45 to 80 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Patients 45-80 who underwent colonoscopy from 2009 to 2022 at the Montreal University Hospital Center (CHUM) with 1+ SL or HGD detected at index colonoscopy and lacking follow-up within or beyond the surveillance interval recommended by 2020 USMSTF guidelines. Exclusion Criteria: * 1\) Patients with a diagnosis of inflammatory bowel disease; * 2\) Hereditary CRC syndromes; * 3\) CRC at index colonoscopy; * 4\) Serrated polyposis syndrome; * 5\) Life expectancy too short to benefit from colonoscopy; * 6\) Follow-up colonoscopy not yet due according to USMSTF guidelines. Patients with concomitant HRA and SL at index will be invited to participate if the index (or last) colonoscopy was performed more than 1 year ago. This is based on the high rates of HRA we identified in our retrospective study posing increased risks for these patients.

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Conditions

The condition(s) this trial relates to.

colon adenoma colorectal neoplasm colorectal cancer prevention target

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Colon adenoma Colorectal cancer

Contacts and locations

Locations

  • Centre Hospitalier de l'Université de Montréal

    Montreal, Quebec, Canada

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