Best of luck with your husband's treatment. This forum is a great source of info and help.
I was diagnosed 3.5 years ago, Gleason 9, stage 4 with mets to lymph nodes and one spot on pelvic bone. I was started on Firmagon and Abiraterone w/ prednisone. After 2 months (PSA dropped to zero) I received 28 photon radiation treatments w/ several SBRT shots to the pelvic lesion. After 3 years on ADT my PSA continued to be undetectable and I am now on "vacation" from ADT. Labs are due next month .... hoping for good results but recognize that long-term, it's unlikely going to go away.