BPH and CA how likely to have both?

Hi all,

A couple o' questions:

1) How likely is it to have both BPH and CA at the same time.
  I know that it's possible, but I dont  know anyone
  who has actually had this.  Does anyone in the group have
  any acutal personal knowledge of this happening?

2) Multiple biopsies.  Is there really any point to this with
  BPH? If you have a negative biopsy and an enlarged prostate,
  does a second or third biopsy actually tell you anything.
  Ive seen several different studies, some say yes, some
  say no.  

  Again, does anyone have any personal knowledge of subsequent
  biopsies actually finding anything?

  I know PCA is a concern, but Im also somewhat concerned about
  poking the thing full of holes. That cant be good for it,
  I dont care what they say.

                                          TIA