@ezupcic
If the cancer was isolated to the prostate, The Gleason score is not too high, Then SBRT is a good decision. My brother had it done at 77 with the Gleason score of 4+3.

ATRUS biopsy is transrectal not transperennial. Has a higher risk of infection.

You can have the same ultrasound guided Biopsy that is transperennial. I read a couple of days ago that’s the only thing Mayo does now.

As to when to stop AS, There’s a lot of factors involved. Are you only Gleason 3+3? If 3+4 is it a very small percentage of four? You could probably get a better feel for what the answer is by watching these videos.

Here is a video with Dr. Laurence Klotz, one of the experts on active surveillance. He can give you answers as to why you would or would not be a good candidate for active surveillance.

Here is a video by Dr. Epstein discussing active surveillance and more