Study of Gemcitabine With TheraSphere® (Yttrium-90)in Patients With Hepatic Tumors of Pancreatobiliary Origin

Therasphere is a form of treatment that has been designed to selectively deliver radiation to the cancer within the patient's liver. This form of treatment has been used in a number of clinical trials and has been approved for use in the treatment of liver cancer. The investigators want to test the safety of using Gemcitabine (a chemotherapy drug) with TheraSphere (radioactive beads that are injected directly into the blood vessel supplying the tumor in the liver) in patients with advanced pancreatobiliary tumors such as pancreatic cancer or cholangiocarcinoma (bile duct tumors) involving the liver.