Because biopsy readings are so subjective, it's common to request a 2nd opinion.
Often it's done in the case of a grey area to gauge if it's negative or positive. If they're informed, some men request a 2nd opinion on a positive biopsy to help clarify their gleason score, as this will have a bearing on what treatment they might choose.
I had the same problem with a 10 snip biopsy in 2004: after another opinion, they eventually decided that one was positive (G6) and one had high grade PIN.
All 12 samples in my 2006 biopsy were clear.
My PSA has remained fairly stable in the meantime.
Interpretation of PSA results, biopsy readings and treatment options are not as black and white as some like to imagine.