Makes you wonder, doesn't it?
Yes, it certainly does. We may never know the whys of this disease.
But, in your case, the way I would look at it is, there's no reason why it couldn't just stay indolent at that level and never clinically bother you the rest of your life, i.e., if it was going to go south, it would have done so by now. I mean, to be at five years and still holding at a psa that most RO's wouldn't even treat yet is really outstanding.
So, great news, worthy of a Chateau Lafite Rothschild 1907, and, when I get an extra $5000, I'll buy it for you to celebrate, ha.
Jan '08-'11 PSAs 2.2 2.5 2.7 2.6, DREs-
Jan '12: PSA 3.6, DRE+
Jan '12: MRI inconclusive
Feb '12: PCaDx pT2a, 4/12+ (3 @ 3+3, 1 @ 4+3); 3% tot cores; bone scan-
Apr '12: RALP; 3+4=7; pT2c pN0 pMx; 30%; 3mm r lat margin of 3+3=6 so pT2+; EPE-; PNI+; 8 LN-; SV-
TRT 03/'14-now; uPSAs: <.015 til 02/17; mostly .020-.030; then .048 on 12/1/18