Hi MDbdh, For the past four years my PSA has always bumped along with low numbers, but metastases occurred early in that time scale so spreading can sometimes occur whilst PSA numbers are low. It seems to have happened in your dad's case. There are lots of treatments available still for him, so don't get too concerned. I've had a single figure PSA (actually under five) for about nine and a half of the ten years plus since diagnosis. The problem is that no one treatment seems to last for ever, but with every year that passes more treatments become available, so whilst curing your dad or me isn't a prospect, extremely long survival periods are now becoming relatively common.
I wish him and you good luck!
AC