Can fibrocystic breast disease lead to breast cancer?

No, but... All women at some time have some of the changes we used to call "fibrocystic disease". Fibrosis and cysts pose no risk. If a woman has sclerosing adenosis or one of the atypical epithelial hyperplasias, her risk for a subsequent breast cancer is somewhat increased. I'd urge old-fashioned self-exam at the same time each month for all women, with biopsy of any dominant mass.
Many have. Fibrocstic disease; few develop breast cancer. In addition to the genetic and familial risks, dense breasts are emerging as an independent risk, but this is confounded by the fact that it is difficult to image dense breasts with routine mammography, .