This is difficult to answer because in the UK he would not have been offered brachytherapy - it is reserved only for men with low or intermediate risk prostate cancer (usually G7 or less, PSA of 10 or below) whereas your man already had a very high risk diagnosis.
Different countries do have slightly different approaches to advanced cancer treatment; depending on which hormones he was on until now, in the UK they would probably have tried:
- adding a second kind of hormone to the first
- stopping the second hormone to see if there is a withdrawal response
- changing to Abiraterone or enzalutimide
- starting docetaxel chemo
- changing the hormone treatment to an oestrogen one like Stilboestrol
- in some countries (including SA I think) surgical castration is more common than in the UK
- a second line chemo like cabazitaxel
- Radium 223 if there are bone mets
Is he black? Were you ever told what kind of prostate cancer it is (adenocarcinoma is the most common but there are many other types, some of which don’t respond to normal treatments)? Most important - exactly which hormone treatment has he already had?