Vistacal said...
but my big worry is having salvage radiation and then all the while the cancer was living somewhere else,
That's a reasonable concern. The psa may be coming from the prostate bed, in which case RT can be curative, or it might be from somewhere else, in which case it won't. At this point I think you have to assume that it's coming from the prostate bad, get RT, and hope for a cure. Anything else would be giving up on the possibility of a cure prematurely.