Wow, I'm so sorry to hear about your dad, that's never the news you want to hear - either as the person getting it or family. The biopsy will determine the grade of his cancer and what his options are for dealing with it. It's hard to tell from the description but are you certain of prostate cancer? A PSE test will tell you for sure. A high PSA doesn't guarantee prostate cancer, just as a low one doesn't guarantee no cancer either. The biopsy and PSE will absolutely solve the riddle if you don't know for certain and from there you can get a Decipher test to help determine if it's even more serious than the biopsy says it is.

Nobody wants a biopsy, nobody. My wife's 90 year old father was just told he is likely in our little club here, and at his age it's unlikely they'll do much more than ADT to just stop the growth. At your dads age it's still treatable and ADT is a good first step.