I had a renal cell carcinoma about 6 cm in diameter. It was hanging off the lower lobe of my left kidney. They wanted to remove the whole kidney but I have chronic kidney disease so I asked for a different opinion. One of the options was cryoablation which was down played by the doctors. I asked for a consult with the interventional radiologist and found that they indeed could do that. I asked the radiologist if he had done one my size before and he said that he had done some close to that. I opted for that with high hope for success and that happened !The whole procedeure took about 3 hours and required no hospital stay. Doctors feel that a cure was obtained but I am going to be watchful by having regular scans done. I know 8 cm. sounds large but it may be possible for you. My procedure was done at Scripps in San Diego Ca. Best wishes for you.