The breast is made up of glands called lobules that can make milk and thin tubes called ducts that carry the milk from the lobules to the nipple. Breast tissue also contains fat and connective tissue, lymph nodes, and blood vessels.
The most common type of breast cancer is ductal carcinoma, which begins in the cells of the ducts. Breast cancer can also begin in the cells of the lobules and in other tissues in the breast. Invasive breast cancer is breast cancer that has spread from where it began in the ducts or lobules to surrounding tissue.
In the U.S., breast cancer is the second most common cancer in women after skin cancer. It can occur in both men and women, but it is very rare in men. Each year there are about 2,300 new cases of breast cancer in men and about 230,000 new cases in women.
PDQ Treatment Information
- Unusual Cancers of Childhood Treatment (PDQ®)
- Late Effects of Treatment for Childhood Cancer (PDQ®)
- Inflammatory Breast Cancer
- Paget Disease of the Breast
- Surgery Choices for Women With DCIS or Breast Cancer
- Sentinel Lymph Node Biopsy
- Adjuvant and Neoadjuvant Therapy for Breast Cancer
- Hormone Therapy for Breast Cancer
- Breast Reconstruction After Mastectomy
- Drugs Approved for Breast Cancer
- Clinical Trials to Treat Breast Cancer