Last fall, research was published showing that women with dense breasts are more likely to be diagnosed with breast cancer–four times more likely, if you compare women with the densest breasts to women at the other end of the scale, with the least dense breasts. Now, a new study finds that women with dense breasts AND a high level of sex hormones – including estrogen and testosterone – are at a SIX times greater risk for breast cancer. And that’s significant.

What does that term mean,...