That's a new one on me, and I've researched both colon and prostate
cancers extensively because I have (had?) both (unrelated). Not saying
it's not valid, just that I didn't run across that advice. Doesn't PC
metastasize primarily to such locations as bone, bladder, etc. and much
less often to the colon?

I.P.

I had an early stage colon cancer and had a portion of my colon removed
three years after my prostatectomy.  But.... my gastroenterologist was quick
to point out that there was *no* correlation between the colon polyp cancer
and the prostate cancer.

MikeH

I have been so told.

There are two reasons I know of to think about it.

One is that, according to some, whatever it is about your genetic
makeup that makes you susceptible to one kind of cancer might
mean that you are also susceptible to others.

I've heard that theory stated but have no information about
whether it's just a hypothesis or whether there's data to back
it up.

The second one is that, if you have radiation therapy, you
might conceivably get a secondary cancer from it and you
should be monitored.  The odds are apparently very low, but
higher than if you didn't have radiation.  Obviously, this only
applies to radiation patients.

   Alan