5. Selective internal radiation therapy (SIRT):
It is a method similar in concept to TACE, and is sometimes called TARE transarterial radiofrequency embolization. It is done in the same manner by injecting the feeding artery with a radioactive beads or microspheres made out of yttrium 90 or theraspheres that are subjected to direct high dose radiation >100 Gy that causes tumor necrosis without affecting the surrounding structures and this technique has been mostly used in treating metastatic lesions from a primary colorectal cancer with good outcomes.
