Most breast cancers depend on the hormone, estrogen, in order to grow. Drugs that block or interfere with estrogen can help stop the growth of most breast cancers. Hormone therapy is not an option if the tumor does not have estrogen receptors.

Hormone therapy for breast cancer may include:

• Aminoglutethimide (Cytadren)
• Anastrozole (Arimidex)
• Diethylstilbestrol (DES)
• Letrozole (Femara)
• Megestrol (Megace)
• Tamoxifen