11.   Dense breast tissue occurs in women of all ages but is more frequent in younger women.

12.   Doctors would examine breast tissue from the trial under a microscope to see whether the ablation killed the tumor.

13.   Everyone has skin and some amount of breast tissue.

14.   Experts say because childbearing and subsequent breast-feeding reduce the lifetime number of menstrual cycles, they may reduce the exposure of breast tissue to cancer-promoting estrogens.

15.   Her breast tissue was difficult to monitor because younger women have breast tissue that is more dense.

16.   In addition, breast tissue of younger women is denser, making it harder for mammography to pick up suspicious lesions.

17.   In this scenario, the fluids behave like estrogen and attach themselves to cells in the fatty breast tissue.

18.   In women with fibrocystic disease and in premenopausal women with dense breast tissue, cancers are more difficult to detect.

19.   Invasive breast cancer is cancer that has invaded the breast cell tissues.

20.   It may spread to underarm nodes, but it starts within the breast tissue, usually in milk ducts.