This clinical trial focuses on patients with PD-L1 positive advanced colorectal cancer. The study evaluates a new combination treatment approach that includes several medications: ONO-4578 (taken as tablets), Opdivo (nivolumab), bevacizumab, and a chemotherapy combination called mFOLFOX6 which consists of oxaliplatin, fluorouracil, and leucovorin.
The purpose of this research is to determine if two different dose levels of ONO-4578 given together with Opdivo and standard treatment (mFOLFOX6 plus bevacizumab) are safe and effective compared to the usual standard treatment alone. The medications will be given in different ways – some as tablets taken by mouth and others through an intravenous infusion into a vein.
During the study, participants will be randomly assigned to receive either the new combination treatment or the standard treatment. The study team will monitor how well the treatment works and track any side effects that may occur. Participants will have regular check-ups, including physical examinations and various medical tests to evaluate their response to treatment and ensure their safety throughout the study period.



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