Chemoembolization is a technique that has been very successful at treating primary liver tumors (hepatocellular carcinoma) or biologically active tumors that have spread to the liver (carcinoid or neuroendocrine tumors). This procedure involves delivering high doses of chemotherapy to the tumors while cutting off their blood supply. This limits the effect on the surrounding healthy parts of the liver. Patients also avoid the adverse effects of chemotherapy, such as hair loss and diarrhea. A catheter is placed into the artery in the groin and is passed into the artery to the liver. Chemotherapeutic drugs and particles to block flow are infused into the tumor bed. Patients usually stay one night in the hospital following this procedure. The Interventional Radiology physicians at Thomas Jefferson perform over 500 chemoembolization procedures/year and have published extensively on the topic.