PSA level lower

Need insight,

I am appx. 6 mo. past external beam radiation treatment and have been on casodex and lupron for 9 mo. My latest PSA results were .4 down from 31 last february. I also had a gleason of 9.

My question is what does that mean?

I am scheduled to remain on both hormone drugs for a total of two years. What do I have to look forward to down the road. I have read some information that the hormone drugs cease to have an effect after a while.
Does this mean that the cancer rears its ugly head again with the origional prognosis?
Any been there done that information would be appreciated.

Thank you,

Michael Beavers