Hi and welcome to the forum. I won't be much help expect that my hubby is. Gleason 10 and was diagnosed on Dec 2010. He hasn't yet had chemo or any of the new drugs, though we are currently waiting to see if he is suitable for radium 223.
No one can give you a prognosis because no one knows how anyone will react but I have to say that organ involvement is a tough one, though we had some in the liver a few years back and the treatment he was put on did stop it in its tracks and we haven't seen organ involvement since. I think that in your case the cancer is more aggressive than in ours, despite the same Gleason score (which was confirmed again fairly recently). I wish I knew what it is that has prevented my hubby's cancer from taking off, if I did, I'd bottle it and pass it around here.
Good luck with the results.
Devonmaid