I completed a 5-treatment SBRT in August 2019. I completed 2 follow-up exams. PSA levels at Feb, 2020 & Oct 2020 remain suppressed at 0.44 (was at 13.7 prior to treatment. By sheer luck, I was treated at the only VA oncology dept in the USA that offered the proton treatment. And, my doctor was a pioneer in the 5-treatment protocol during residency training at MSKCC in NYC. My doc had performed hundreds of these 5-treatment protocols.

PRE-treatment prep is ESSENTIAL (for me 6 visits) The exact, precise 3D imagining & position of your prostate needed to guide the delivery of radiation ton within 1mm of the boundaries of the prostate is crucial. Then, one must carefully follow all instructions as to fluid consumption prior to each treatment to ensure the prostate assumes the same 3D location as was achieved in the pre-prep imaging process. Finally, it is crucial in the pre-prep that the placement of the spacer between your prostate and rectum is dead-on to void harmful radiation exposure to the rectum
Finally, expect near-term urinary and ED issues.
Q - how experienced is your oncologist with the 5-treatment protocol? Equally important - how unified & disciplined is the doctor's pre-pre & treatment TEAMs (and I mean a TEAMs) with the procedures procedures
BK