Gut bacteria boost? new trial tests probiotics to help immunotherapy fight stubborn colorectal cancer
NCT ID NCT06865521
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This early-phase study tests whether adding Akkermansia probiotics to standard immunotherapy and chemotherapy can safely help patients with advanced colorectal cancer that hasn't responded to prior treatments. The trial enrolls 22 adults whose tumors are MSS/pMMR type, which typically don't respond well to immunotherapy alone. Researchers will monitor side effects and measure tumor shrinkage, as well as changes in gut bacteria.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Akkermansia probiotics (Songke) combined with anti-PD-1 monoclonal antibody and standard treatments (chemotherapy, TKI, or bevacizumab)
- What this could lead to
- If it works, this could point toward a way to make immunotherapy more effective for hard-to-treat colorectal cancers.
- What could go wrong
- This is a very early, small (22 people) single-center trial with no control group. The probiotics may not improve outcomes, and side effects from the combination are unknown.
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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About 22 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Feb 2025
- Expected to finish
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Mar 2027
An estimate. End dates often move.
- 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 75 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: * • Age 18-75 years * ECOG performance status score of 0-2 * Histopathologically confirmed colorectal cancer; tumor tissue immunohistochemistry or genetic testing showing pMMR or MSS/MSI-L type * Metastatic colorectal adenocarcinoma that has failed standard treatments (including irinotecan, oxaliplatin, fluorouracil, bevacizumab, cetuximab, etc.) * No prior use of immunotherapy (such as immune checkpoint inhibitors, adoptive cell immunotherapy, etc.) * At least one evaluable lesion according to RECIST version 1.1 criteria * No intestinal obstruction and good oral compliance * Adequate bone marrow, liver, and kidney function to receive treatment * Signed informed consent Exclusion Criteria: * • History of allergic diseases, severe drug allergies, or known allergies to probiotic drugs * Use of antibiotics or probiotic drugs/health products within the last 3 months * History of other malignancies with a disease-free interval of less than 5 years (except for cured basal cell carcinoma of the skin, cured cervical carcinoma in situ, and gastrointestinal tumors cured by endoscopic mucosal resection) * Presence of any active autoimmune disease or history of autoimmune disease * Current use of immunosuppressants or hormone therapy, continued within 2 weeks prior to enrollment * Concurrent severe infections * Congenital or acquired immune deficiency, or active hepatitis * Concurrent severe complications
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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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Colorectal Cancer, West China Hospital
Chengdu, Sichuan, 610041, China
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Colorectal Cancer, West China Hospital
Chengdu, Sichuan, China
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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