What is "therasphere"

TheraSphere is a hepatocellular carcinoma (HCC) treatment therapy that consists of millions of microscopic, radioactive glass microspheres (20–30 micrometres in diameter) being infused into the arteries that feed liver tumors. These microspheres then embolize, lodging themselves in the liver's capillaries and bathing the malignancy in high levels of yttrium- 90 radiation. It is currently approved for patients as a neoadjuvant to surgery or transplantation by the U.S. Food and Drug Administration and is being used at a number of clinical centers in the United States.