RecruitingPhase 3Drug trialIdentification and Treatment Of Micrometastatic Disease in Stage III Colon CancerThis research study is comparing two standard of care treatment options based on blood test results for participants who have metastatic colon cancer. The names of the potential treatments involved in this study are: * Active surveillance * FOLFIRI treatment * Nivolumab treatment * Encorafenib/Binimetinib/Cetuximab treatment * Trastuzumab + Pertuzumab