 I am Dr. Ravichan Siddhachari. I am a consultant hepatobiliary surgeon and chief liver transplant surgeon at Manipal Hospital's Old Airport Road, Bangalore. TAS stands for Transarterial Chemoembolization. That means a catheter is inserted into your groin. That is to the femoral artery and the catheter is forwarded to the hepatic artery and straight to the tumor. And chemotherapy, the medical particles are injected through this catheter and so the chemotherapy is directly acts on the cancer. And following the chemo injection, small beads and gels are inserted to block the artery so that the medicine stays in the liver tumor bed. So the TAS is basically used for downsizing the tumor and also for those patients who cannot enable to withstand a surgical treatment. For them, TAS is used. TAS is also used as a bridge to transplant in the sense to downsize and then later consider for liver transplantation.