Posted 10/5/2018 3:17 PM (GMT -6)
Was this his primary treatment? Assuming it was:
The ADT will lower PSA to near zero. As his T-levels improve, his PSA will rise. If he's still having hot flashes then he might not have recovered fully his T-level.
The RT will have done it's damage to the PC, but that can take years (2-4) to get to full nidar, so it's possible that his PSA might rise as his T-level recovers and then start going back down as the RT finishes off the remain PC cells. If he still has a prostate, then his PSA will never hit "0" but could be very low - .2 or .4 or something in that range.
And at this PSA levels, scans would be useless as any remaining PC would be microscopic and not visible on a scan.