Can Polycystic Ovaries Syndrome cause ovarian cancer?

I have PCOS (Polycystic Ovaries Syndrome) and I'm scared that it will cause ovarian cancer. I haven't got my periods this month, and I'm not pregnant (I've had several tests done to confirm that). And if I stop getting my periods, is that a symptom of ovarian cancer, or is it just when I bleed when I'm not supposed to?