There's a new genetic test called PORTOS that seems to do an excellent job at predicting whether salvage radiation therapy will be successful. It is currently only available when one orders Decipher for about
$4,000. There are several important caveats to consider before one rushes out to pay for it, and it requires additional validation. Read carefully before deciding:
PORTOS: a gene signature that predicts salvage radiation success(I wrote this up last night so I could begin my novel today. I'll check back later to see if there are questions I can answer.)