Symbiotic-GI-03: A Study to Learn About the Study Medicine Called PF-08634404 in Combination With… (NCT07222800) | Clinical Trial Compass
RecruitingPhase 3
Symbiotic-GI-03: A Study to Learn About the Study Medicine Called PF-08634404 in Combination With Chemotherapy in Adult Participants With Metastatic Colorectal Cancer
United States, Argentina, Australia800 participantsStarted 2025-12-11
Plain-language summary
The purpose of this study is to learn more about a new medicine called PF-08634404, and how well it works in people with cancer of the colon or rectum (CRC)). The goal is to understand if the new study medicine, combined with chemotherapy that is approved for colorectal cancer, can help people whose cancer has spread or returned after treatments taken before.
To join the study, participants must meet the following conditions:
* Be 18 years or older.
* Have colorectal cancer that has spread to other parts of your body.
* Be in good enough health to receive study treatment.
* Should not be pregnant before starting treatment.
Participants will be randomized (like flipping a coin) to one of 2 different treatment arms. The first arm (Arm A) will include the new medicine PF-08634404 in combination with chemotherapy that is approved for colorectal cancer, and the second arm (Arm B) will include an approved medicine for colorectal cancer, called Bevacizumab, in combination with chemotherapy that is approved for this type of cancer. Participants and their doctors will not know which arm they are being assigned to. Participants will receive all the study medications through intravenous (IV) infusions, which means the medicine is given directly into a vein. The treatment will be given in cycles, and participants may continue receiving it if it is helping and they are not experiencing serious side effects.
The medicine will be given at a clinical site, where trained medical staff will check participants during and after each treatment.
* The study is expected to last approximately 33 months for each participant.
* Participants will have regular visits to the study site for treatment, health checks, and tests.
* After stopping treatment, participants will return for a final visit about 30 to37 days later to check their health and review any side effects.
* Follow-up will continue every 12 weeks by phone or in person or by reviewing health records to check on health status and any new treatments.
Who can participate
Age range
18 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Histological or cytological confirmed colorectal adenocarcinoma.
* Evidence of Stage IV metastatic disease.
* No prior systemic therapy for metastatic disease.
* Eastern Cooperative Oncology Group performance status (ECOG) 0-1
* At least one measurable lesion according to RECIST 1.1 per Investigator assessment.
* Adequate hepatic, liver, and renal function
Exclusion Criteria:
Participants are excluded from the study if any of the following criteria apply:
* Locally confirmed BRAF V600E mutation
* Locally confirmed microsatellite instability (MSI)-high or DNA mismatch repair deficiency (dMMR) colorectal cancer
* Participants with known active symptomatic CNS lesions, including leptomeningeal metastasis, brainstem, meningeal, or spinal cord metastases or compression
* Clinically significant risk of hemorrhage or fistula
* Major surgery or severe trauma within 4 weeks prior to the first dose, or planned major surgery during the study
* History of allogeneic organ transplantation and allogeneic hematopoietic stem cell transplantation
* Any Grade ≥3 bleeding/hemorrhage events within 28 days of Cycle 1 Day 1, or prior history of clinically significant bleeding events
* Clinically significant cardiovascular disease, or other comorbidities, within 6 months prior to first dose
* Participants with active autoimmune diseases requiring systemic treatment within the past 2 years
* Evidence of non-infectious or drug-induced interstitial lung disease (ILD) pneumoni…
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Progression-free survival (PFS) per Response Evaluation Criteria in Solid Tumors 1.1 (RECIST 1.1) by Blinded Independent Central Review (BICR)