You are, based on the way I track things, asking the impossible.  But, I
certainly understand the curiosity.  As Leonard would tell you, I'm already
skating on thin ice trying to call anything I do a statistic.  First, the
"qualification" for getting into my database is anonymously coming to this
NG and stating you or your loved one has cancer.  That is pretty much the
end of any reliable stat.  I can tell you with great confidence that 100% of
the people in my database have access to an Internet connection  :-)

Once they get here, only a few stay -- probably less than a dozen since I
first logged on.  Maybe 20 or 40 come back and report quarterly, annually or
after a few years.  Otherwise, I just don't know what happened to the rest.

I can give you maybe one guess based on my observations... It seems about
1/3rd of the people with undetectable PSAs after surgery end up with
detectable ones.  Most of those within about 1½ years.  And that is far from
supported by any scientific or refereed documentation.