This pilot study will evaluate the safety and effectiveness of chemo-radiotherapy comprising a regimen of FOLFOX6 chemotherapy plus SIR-Spheres yttrium-90 microspheres (chemo-radiotherapy, also known as "chemo-SIRT"), in combination with the biologic therapy Bevacizumab (Avastin), for the first-line treatment of patients with liver metastases from colorectal carcinoma in whom surgical resection is not feasible.