PhII Trial Panitumumab, Nivolumab, Ipilimumab in Kras/Nras/BRAF Wild-type MSS Refractory mCRC

The investigators will conduct a single-arm, open-label Phase II clinical trial investigating the combination of nivolumab and ipilimumab with panitumumab in subjects with unresectable, refractory, KRAS/NRAS/BRAF wild-type, microsatellite stable (MSS) metastatic colorectal cancer (mCRC). There will be an initial safety lead-in cohort to ensure the combination is well-tolerated. The primary objective of this study is to estimate the overall response rate in these subjects at 12 weeks . Secondary objectives include the following: estimating the overall response rate in these subjects at 12 weeks by immune-related RECIST criteria (irRECIST), estimating the best response rate by both RECIST 1.1 and irRECIST criteria, estimating progression-free survival (PFS) and duration of response using both RECIST 1.1 and irRECIST criteria, estimating overall survival (OS), and characterizing the safety issues associated with this regimen. Exploratory objectives involve investigating various biomarkers and peripheral blood and tumor assays.