Exercise may alter gut bacteria in colon cancer survivors, small study hopes to find out
NCT ID NCT05930496
First seen Jun 25, 2026 · Last updated Sep 03, 2026 · Updated 3 times
Summary
This study tests whether a moderate-to-vigorous exercise program can change the gut bacteria of people who have survived stage II or III colorectal cancer. Researchers will enroll 30 survivors and randomly assign them to either an exercise group or a health education group. The main goal is to see if the study is feasible, while also exploring how exercise affects gut bacteria and whether those changes relate to cancer outcomes and quality of life.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Exercise intervention
- What this could lead to
- If it works, this could show that exercise improves gut bacteria in colorectal cancer survivors, pointing toward a way to enhance cancer prognosis and quality of life.
- What could go wrong
- This is a small pilot study with only 30 participants, so results may not apply to everyone. It focuses on feasibility, not proving health benefits, and the effects on gut bacteria may be minimal or unclear.
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
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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
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10 people
The number who actually took part.
- Started
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Jul 2025
- Finished
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Jun 2026
- Lead sponsor
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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
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18 to 70 years
- Sex
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Anyone
- Healthy volunteers
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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 Hide 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: * 18-70 years of age * Previous diagnosis of stage II-III CRC cancer * No known current, recurrent, or metastatic disease * No comorbid or physical limitations that would limit participation at the discretion of the treating provider * At least 60 days to 3 years from last cancer-directed treatment (including surgery, chemotherapy, and radiation. Elective surgery, including ileostomy reversal, is not counted in this timing but patients must be able to eat a normal diet, without post-operative dietary limitations) * Body mass index (BMI) 18.5-35 kg/m\^2 * Able to understand and willing to sign written informed consent in English * Access to phone for study contacts * Access to a smart phone or tablet to connect to the Polar H10 Heart rate sensor during remote exercise sessions and attend virtual exercise sessions * Be willing and able to attend up to 24 sessions in-person at the Fred Hutch Exercise Research Center Shared Resource or virtually via phone, Zoom, or Microsoft Teams, based on participant preference * Access to internet (internet access may be provided on a case-by-case basis to participants where access to internet would otherwise be the only barrier to participation) * Willingness to participate in all study activities * Completion of all run-in activities * Participants must have an Eastern Cooperative Oncology Group (ECOG) Scale of Performance Status score of 0 or 1 for performance status * Women must not be pregnant, breastfeeding, or planning to become pregnant Exclusion Criteria: * Use of oral or intravenous antibiotics, antifungals, or antiparasitics during the past 6 months * Presence of an ileostomy or colostomy because of known changes to the gut microbiome with ileostomies and colostomies * Current status of underweight (BMI \< 18.5 kg/m\^2) or class II/III obesity (BMI ≥ 35.0 kg/m\^2) * Presence of inflammatory bowel diseases such as Crohn's disease or ulcerative colitis as these are known to baseline have differences in gut microbiome composition * Women who are pregnant, breastfeeding, or planning to become pregnant * Physician notification to not approach patient for the study
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Fred Hutch/University of Washington Cancer Consortium
Seattle, Washington, 98109, United States
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