Great news for both of you .
I was diagnosed High risk locally advanced T3b, in December aged 62, and had HT from February. Then High Dose Brachytherapy in July and External Beam Radiotherapy ,23 sessions,July/August.
My original PSA was 26.7 , before Radiation ! I was down to 2.0 and then just a few weeks after EB Radiotherapy it went down to 0.37 . So I have till December 2019 on the HT and after that I will find out if it’s all worked . I know it will take time for the HT to leave my body so it’s a waiting game, and dealing with this damned HT.
Can’t fault the hospital so far ....
best of luck and hope the drop continues. Keep posting your progress. It’s great to hear of some success amongst a lot of sadness.