I agree, you're in uncharted waters vis a vis this topic. That is, there's likely no way to ascertain/predict the effect (if any) of anavar usage re the risk/prognosis of breast and/or gynecologic CA in otherwise healthy women, as there aren't any studies (to my knowledge) addressing this. On one hand, there IS evidence suggesting that elevated test levels increase the risks of these cancers. However, anavar isn't test, and in fact is known to have relatively low adrenergic activity (at least at low dosages). So who knows.
If you wouldn't mind sharing the opinion of your physician(s) on this subject, I would be very interested to hear them.