Sam, I understand what you mean, and you are not alone. My husband was diagnosed two years ago with a PSA of 120, Gleason 9, already spread to the lymph nodes. He has been on hormone therapy for those two years and feels fine, other than the side affects of the HDT. His PSA is currently less than 1.
We all need to stick together and help each other as best we can. I hope your Dad does well with his treatment.