Breast Facts

  • Inside a woman’s breast are 15 to 20 sections (lobes).
  • Each lobe is made of many smaller sections (lobules).
  • Lobules have groups of tiny glands that can make milk.
  • After a baby is born, breast milk flows from the lobules through thin tubes (ducts) to the nipple.
  • Fibrous tissue and fat fill the spaces between the lobules and ducts.
  • Statistically, for every 10 women with breast cancer, 7 will have cancer in the ducts (ductal carcinoma) and 1 will have cancer in the lobules (lobular carcinoma).

Source: What you need to know about breast cancer, National Cancer Institute, U.S. Department of Health and Human Services, National Institutes of Health, August, 2012.