Sirtex Medical is a global healthcare company that develops and markets minimally invasive interventional systems for the treatment of liver cancer. Its flagship product is SIR-Spheres® Y-90 resin microspheres, a targeted radiation therapy used in selective internal radiation therapy (SIRT) for treating inoperable liver tumors. The company aims to improve the treatment of cancer and has a global presence with offices and manufacturing facilities in the U.S., Australia, Germany, and Singapore.