Breast Cancer and Hormone Therapy

There are certain hormones that can attach to breast cancer cells and affect their ability to multiply. The purpose of hormone therapy — also called hormonal therapy or hormone treatment — is to add, block, or remove hormones.

With breast cancer, the female hormones estrogen and progesterone can promote the growth of some breast cancer cells. So in these patients, hormone therapy is given to block the body’s naturally occurring estrogen and fight the cancer’s growth. There are two types of hormone therapy for breast cancer.

  • Drugs that inhibit estrogen and progesterone from promoting breast cancer cell growth.
  • Drugs or surgery to turn off the production of hormones from the ovaries. Do not confuse the term hormone therapy that is used for treating breast cancer patients with hormone replacement therapy that is typically used by postmenopausal women. Hormone therapy for cancer treatment stops hormones from getting to breast cancer cells. Hormone therapy for postmenopausal women without cancer — in the past called “hormone replacement therapy” — adds more hormones to your body to counter the effects of menopause.

Who Gets Hormone Therapy for Breast Cancer?

As part of the diagnosis process, tests are done to determine if the breast cancer cells have estrogen or progesterone receptors. If so, that means that growth of the cancer can be stimulated with these hormones. If a cancer is found to have these receptors, hormone therapy is recommended as part of the treatment plan.

What Hormone Therapy Drugs Are Used for Breast Cancer?

There are several common hormone therapy drugs used for breast cancer:

  • Tamoxifen
  • Fareston
  • Arimidex
  • Aromasin
  • Femara
  • Zoladex/Lupron
  • Megace
  • Halotestin

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Breast Cancer and Tamoxifen

Tamoxifen is a pill that has been used for over 30 years to treat breast cancer. It was first used in metastatic breast cancer because it slowed or stopped growth of cancer cells in the body. Tamoxifen also decreases the chance that some early-stage breast cancers will recur primarily in premenopausal women and can prevent the development of cancer in the unaffected breast.

In addition, tamoxifen may offer an alternative to watchful waiting or prophylactic (preventative) mastectomy for women at high risk for developing breast cancer. Tamoxifen is a type of drug called a selective estrogen-receptor modulator (SERM). At the breast, it functions as an anti-estrogen. Estrogen promotes the growth of breast cancer cells and tamoxifen blocks estrogen from attaching to estrogen receptors on these cells. By doing this, it is believed that the growth of the breast cancer cells will be halted.

Tamoxifen is considered an option in the following cases:

1. Treatment of ductal carcinoma in situ (DCIS) along with breast-sparing surgery or mastectomy.
2. Adjuvant treatment of lobular carcinoma in situ (LCIS) to reduce the risk of developing more advanced breast cancer.
3. Adjuvant treatment of breast cancer in men and women whose cancers are estrogen-receptor positive.
4. Treatment of recurrent and metastatic breast cancer.
5. To prevent breast cancer in women at high risk for developing the disease.

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