Galileo has told you the story well enough, I am one of those guys on hormone therapies, been 8 yrs. currently (very thankful for that). We don't know if your friend has definitive 'mets' to spine, but if proven so and pains set in...they can radiate spots to relieve pain (not a curative intent but palliative) but does work to relieve pain which to a spine area could almost cripple ones movements literally. Maybe tell you friend to get the book: A Primer on Prostate Cancer by Dr. Strum & Donna Pogliano it has cases, examples of patients whom had/have mets, there scenario and some of there treatments and findings to read about
...helps take away some of the fear factor, perhaps. Website with patients histories/stories at www.yananow.net
The best type of doc for this person would likely be a PCa specialist oncologists, so advise friend to find one real soon for best care for all issues he is facing.
Youth is wasted on the Young-(W.C. Fields)