If you have been diagnosed with any form of cancer in your liver, your doctor may recommend a number of possible treatments.  These include surgery to remove the cancer, chemotherapy or biological therapy to deliver treatment through your bloodstream, or various therapies that target liver tumours directly. Selective internal radiation therapy (SIRT) allows specialised interventional radiologists to implant millions of radioactive resin microspheres called SIR-Spheres^® Y-90 resin microspheres that treat liver tumours directly where they occur.