Bacteria cocktail aims to boost cancer immunotherapy
NCT ID NCT04208958
First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study tested a combination of an oral bacterial product (VE800) and the immunotherapy drug nivolumab in 56 people with advanced or metastatic cancers like melanoma, stomach, and colorectal cancer. The goal was to see if the bacteria could help the immune system fight tumors better. Researchers measured safety and how many patients saw their tumors shrink.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- VE800 (a mix of 11 live bacteria) plus nivolumab (Opdivo)
- What this could lead to
- If it works, this could point toward a new way to boost the immune system to fight advanced cancers.
- What could go wrong
- This is an early, small study (56 people) testing safety and response. The bacteria mix may not work for everyone, and side effects are possible.
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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Phase 1/2
Runs two stages together: safety and dose first, then whether the treatment works.
- Participants
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56 people
The number who actually took part.
- Started
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Jan 2020
- Finished
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Feb 2023
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
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 years and older
- 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.
Partial Inclusion Criteria: * Patients with advanced or metastatic cancer who had received no more than 3 lines of prior systemic therapy for advanced/metastatic disease. * Histologically diagnosed advanced (unresectable) or metastatic cancer with at least one measurable lesion as per RECIST 1.1 * Tumor lesions amenable for biopsy, if deemed safe by the investigator * Toxicity from prior cancer therapy should have resolved to Common Terminology Criteria for Adverse Events (CTCAE) Grade ≤ 1 (excluding alopecia and neuropathy, where up to Grade 2 residual was allowed) Partial Exclusion Criteria: * Prior treatment with immune checkpoint inhibitor (iCPI) (Note: this criterion did not apply to patients with melanoma) * Receipt of any conventional or investigational systemic anti-cancer therapy within 21 days prior to the first dose of vancomycin * Concurrent chemotherapy, immunotherapy, biologic, or hormonal anti-cancer therapy. Agents such as bisphosphonates or denosumab were acceptable as prophylaxis for bone metastasis. * Patients must not have received a transfusion (platelets or red blood cells) within 4 weeks of the first dose of study treatment * Patients with an active, known or suspected autoimmune disease. Patients with type I diabetes mellitus, hypothyroidism only requiring hormone replacement, skin disorders (such as vitiligo, psoriasis, or alopecia) not requiring systemic treatment were permitted to enroll. * Patients with known active hepatitis (e.g., hepatitis B or C) NOTE: Patients with previously treated hepatitis B or C were permitted to enroll if there was evidence of documented resolution of infection. * Received a fecal transplant, spore or other preparation of fecal material, isolated bacterial products, genetically modified bacteria, or VE800
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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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Baylor Scott and White Center for Advanced Heart and Lung Disese
Dallas, Texas, 75246, United States
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Florida Cancer Specialists
Sarasota, Florida, 34232, United States
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HonorHealth Research Institute
Scottsdale, Arizona, 85258, United States
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Huntsman Cancer Institute and Hospital
Salt Lake City, Utah, 84112, United States
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Indiana University Melvin and Bren Simon Cancer Center
Indianapolis, Indiana, 46202, United States
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John Theurer Cancer Center
Hackensack, New Jersey, 07601, United States
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Moffitt Cancer Center
Tampa, Florida, 33612, United States
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New York University Medical Oncology Associates
New York, New York, 10016, United States
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Pacific Hematology Oncology Associates
San Francisco, California, 94115, United States
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Swedish Medical Oncology - First Hill
Seattle, Washington, 98104, United States
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The Angeles Clinic and Research Institute - West Los Angeles Office
Santa Monica, California, 90404, United States
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The Miriam Hospital
Providence, Rhode Island, 02906, United States
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The University of Chicago
Chicago, Illinois, 60637, United States
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UPMC Hillman Cancer Center
Pittsburgh, Pennsylvania, 15232, United States
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University of California Los Angeles
Los Angeles, California, 90095, United States
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University of California Los Angeles
Santa Monica, California, 90404, United States
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Washington University School of Medicine Siteman Cancer Center
St Louis, Missouri, 63110, United States
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Weill Cornell Medicine
New York, New York, 10065, United States
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- Can PET scans reveal which stomach cancers will respond to immunotherapy?