How would you manage a patient with oligometastatic colon cancer status post resection of the primary whose single unresectable liver lesion has had a complete response to FOLFOX chemotherapy by PET?   

This could be a pathologic complete response, so I would observe and recommend hepatic directed treatment if it progressed. If this were solitary nodule still, surgical resection would be the treatment of choice, followed by thermal ablation if feasible, and SABR (100Gy BED) is the third choice beca...