Thank you for your information on cyber knife outcomes and your questions. My PSA at time of biopsy was 6 (up from 4.1 of previous year). Biopsy took 16 cores, 12 of which had various amounts of cancer. 10 cores were 3-3 and 2 were 3-4. (Unfavorable intermediate, given over 50% cores having cancer.) My urologist sent cores our for Polaris test (genetic test) to assess level of aggression. I have an enlarged prostate (91 cc). My Urologist, who surgically removes prostates, advised against surgery and I will be seeing a Radiation Oncologist in his practice soon. Apparently, the practice has used Cyberknife for awhile. While I have heard and read good things about Cyberknife, I will likely be talking with other providers and other radiation or ultrasound treatments about a fuller range of options.. While I am 78, I am quite active (regularly work outside with chain saw and other power tools to clear brush and produce firewood from logs, lift weights and use the treadmill frequently.) Increasing longevity will be important as will continence and erectile function. Any further observations would be most appreciated.