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estrogen

a hormone found in both men and women, but at higher levels in women. Often called the female sex hormone, it is made mostly by the ovaries, and in smaller amounts in fat tissue. In girls, estrogen helps to regulate puberty, such as growth of breasts. In women, estrogen levels normally cycle on a monthly schedule to regulate menstruation and prepare the body for fertilization and reproduction. Estrogen may promote the growth of cancer cells in breast cancer. In men, estrogen is sometimes used to treat advanced prostate cancer by countering the action of testosterone. See also estrogen receptor assay, estrogen therapy, hormone, hormone therapy, ovary.

Estrogen and Breast Cancer: Not What We Expected

... Estrogen and Breast Cancer: Not What We Expected. ... The estrogen actually
reduced the risk of getting breast cancer by 33%! ...

http://www.cancer.org/aboutus/drlensblog/post/2006/04/11/estrogen-and-breast-cancer-not-what-we-expected.aspx

Hormone therapy for breast cancer

... Drugs that block estrogen. Tamoxifen: Tamoxifen blocks estrogen receptors
in breast cancer cells. ... Treatments to lower estrogen levels. ...

http://www.cancer.org/cancer/breastcancer/detailedguide/breast-cancer-treating-hormone-therapy

Society-Funded Researcher Studies Aromatase Inhibitors ...

... Aromatase inhibitors fight cancer by lowering the level of estrogen, which
fuels breast cancer growth. The drugs only work ...

http://www.cancer.org/research/acsresearchupdates/breastcancer/aromatase-inhibitors-and-joint-pain

Cancer Glossary

... estrogen Search. a hormone found in both men and women, but at higher
levels in women. ... See also estrogen, hormone therapy. ...

http://www.cancer.org/cancer/cancerglossary/index.aspx?letter=e

What are the risk factors for endometrial cancer?

... Many of the risk factors for endometrial cancer affect estrogen levels.
Before menopause ... Estrogen therapy. Treating the ...

http://www.cancer.org/cancer/endometrialcancer/detailedguide/endometrial-uterine-cancer-risk-factors

Menopausal Hormone Therapy and Cancer Risk

... Estrogen-progestin therapy or EPT. EPT is the use of both estrogen and
progestin to treat menopausal symptoms. ... Estrogen therapy or ET. ...

http://www.cancer.org/cancer/cancercauses/othercarcinogens/medicaltreatments/menopausal-hormone-replacement-therapy-and-cancer-risk

The Bottom Line on Soy and Breast Cancer Risk

... Not good for you?" (I didn't even mention breast cancer.) The responses I got
were, "I think it acts like estrogen in the body"; "Consuming any soy ...

http://www.cancer.org/cancer/news/expertvoices/post/2012/08/02/the-bottom-line-on-soy-and-breast-cancer-risk.aspx

Hormone Therapy: Better Guidance, Less Confusion

... It seems as though we have been bombarded with estrogen stories over the
past several months. ... 3288 women never took estrogen. ...

http://www.cancer.org/aboutus/drlensblog/post/2006/05/09/hormone-therapy-better-guidance-less-confusion.aspx

Hormone therapy for breast cancer

... In those cancers, the female hormone estrogen promotes the growth of the
cancer. Hormone ... Drugs used to block estrogen. Tamoxifen ...

http://www.cancer.org/cancer/breastcancer/overviewguide/breast-cancer-overview-treating-hormone-therapy

Hormone therapy for endometrial cancer

... Tamoxifen. Tamoxifen, an anti-estrogen drug often used to treat breast cancer,
may also be used to treat advanced or recurrent endometrial cancer. ...

http://www.cancer.org/cancer/endometrialcancer/detailedguide/endometrial-uterine-cancer-treating-hormone-therapy