Looks like Dad has levelled off, as I hope I have done.
The main thing with Prostate cancer, is to treat it BEFORE it spreads, otherwise it will be the downward spiral of Chemotherapy Etc.
Anyone reading this, of a certain age, or symptom - get a PSA blood test & the Doctors finger. You need both - Don't be like Bill Turnbull.
In my case, the doctor's finger did not find the problem, as the Tumours were on the opposite side.