My dad had a consultation for the cyberknife at a michigan hospital. He was sooo hopeful that this would be the solution for his PC. Once there they told him that they do not treat primary PC, or tumors larger than 4cm(i believe, my memory isn't that good). So he was extremely disappointed that he was not a candidate. But he was told that the hospital that originally invented the cyberknife may consider him as a candidate but they couldn't be certain. Apparently they didn't have enough of an understanding on how to treat the PC with cyberknife at this point in time..This frustrated the hell out of dad because they advertivsed on tv that PC was one of the things they treated.