Inclusion Criteria:  Verified adenocarcinoma in colon or rectum  Liver metastases that are technically resectable (ablation can be used as an adjunct) without PVE, HVE or ALPPS, but judged in need of further (next line) chemotherapy based on insufficient response to at least one line of chemotherapy. And either  a. Six or more liver metastases, with extra-hepatic disease i. def: >3 pulmonary metastases/radiologically positive non-liver hilar lymph nodes. Or b. Ten or more liver metastases with at least one of the following negative prognostic signs: i. At least one lesion > 7 cm in diameter before chemotherapy ii. CEA > 100 following a full cycle of chemotherapy)?? iii. KRAS and/or BRAF mutant primary tumour. iv. Node positive primary tumour. Or c. Fifteen or more liver metastases  ECOG 0/2 Informed consent  Exclusion Criteria:  Any of the following criteria will exclude participation in the trial:  New liver metastases emerging during completed chemotherapy.  a. These patients may be included if they undergo a complete cycle of next line chemotherapy without new liver metastases emerging.  Previous or current bone or CNS metastatic disease  Any other reason why, in the opinion of the investigators, the patient should not participate.  -