I'm in the same boat as your hubby. Radical prostatectomy in December 2016. January 2017 PSA 0.014. June 0.014. September 0.02 January 2018 0.023.
My PSA is low but is showing an upward trend, or, as my oncologist phrases it, I have persistent PSA. Histology upgraded me to T3b and Gleason 9. I'm 47 years old. So, it's off to radiotherapy for me.
My oncologist wanted a scan to see if it would pick up anything. Although I accept that it is unlikely to pick anything up, I'm having a PSMA PET scan today. Incredibly, the NHS agreed to fund this for me. However, organising it through the NHS has proven to be impossible so I'm off to the private London Clinic today and will pay myself. Probably a waste of money, but maybe I'll be contributing to medical science.
I don't want radiotherapy and I'm having to have it a lot sooner than I would have hoped. But I'm reconciled to it. Just hoping I don't need hormone therapy as well.
Best of luck to your hubby.
Ulsterman