1. Radiation therapy— the use of high energy rays to kill cancer cells and prevent them from growing
  2. Chemotherapy—the use of drugs to kill cancer cells
  3. Hormonal therapy, which keeps cancer cells from getting the hormones they need to grow
  4. Antitumor antibiotics
  5. Antiestrogens, such as tamoxifen, which block the action of estrogen on breast tissue
  6. Monoclonal antibodies to block the protein receptor that is produced in large numbers in women with breast cancer
  7. High-dose progestogens (steroid hormones)