Normal women have reproductive hormones in their system, including progesterone and estrogen. Unfortunately, these hormones can stimulate breast cancer to grow.
One article (1) discussed hormone therapy for breast cancer, including drugs that prevent the ovarian production of hormones, and those that stop the action of progesterone and estrogen from helping breast cancer grow. When a woman is diagnosed with breast cancer, the doctor tests the cells that make up cancer to see if there are any receptors on the cancer cells that might respond to hormone therapy.
Common types of hormone therapy for breast cancer include Toremifene, Tamoxifen, Palbociclib, Megestrol, Leuprorelin, Letrozole, Goserelin, Fulvestrant, Exemestane, and Anastrozole. The type of hormone therapy a woman receives depends on which receptors exist on the breast cancer cells.
Source: 1.Breast Cancer and Hormone Therapy. http://www.webmd.com/breast-cancer/hormone-therapy-overview. Accessed 8/1/16.
Dr. Adem Gunes