How breast cancer starts and expands

What breasts are made of, and where and how cancer starts.

Breast tissue is positioned in the breast, upper chest and the armpit. Each breast consists of 15-20 glands known as lobes, the place milk is produced. These lobes are connected to the nipple by tubes known as ducts. The structure of the lobes and ducts is a little bit like the branches of a tree. Breast cancer commonly begins within the lobes.

The rest of the breast is made of fatty tissue. The breast and armpit also consist of lymph nodes and