OUTLINE: Radioactive material yttrium-90 glass microspheres (TheraSphere®) is infused directly into a liver tumor in order to kill tumor cells and cause less damage to the normal tissue. Patients receive TheraSphere® via hepatic arterial infusion on day 1. This artery is accessed through the femoral artery in the groin. This procedure is generally completed on an outpatient basis. Patients may receive a single dose to the whole liver, or sequential treatments to each side of the liver approximately 30 to 90 days apart. Patients may be re-treated at a later time.