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Answer for the clue "An antagonist for estrogen that is used in the treatment of breast cancer ", 9 letters:
tamoxifen

Word definitions for tamoxifen in dictionaries

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ The drug tamoxifen , first described in the late 1960s, has some value as a palliative in patients with oestrogen-dependent tumours. ▪ The greatest difference had been made by the hormonal drug tamoxifen , which was developed ...

Wikipedia Word definitions in Wikipedia
Tamoxifen ( TMX ), sold under the brand name Nolvadex among others, is a medication that is used to prevent breast cancer in women and treat breast cancer in women and men. It is also being studied for other types of cancer . It has been used for Albright ...

Wiktionary Word definitions in Wiktionary
n. A nonsteroidal estrogen antagonist used in the treatment of advanced breast cancer

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Tamoxifen \Ta*mox"i*fen\ (t[a^]*m[o^]k"s[i^]*f[e^]n), n. a chemical compound ( C26H29NO ) which is non-steroidal but physiogically active as an estrogen antagonist. It is used to treat postmenopausal breast cancer. Chemically it is 1-p-dimethylaminoethoxyphenyl-trans-1,2-diphenyl-but-1-ene. ...

WordNet Word definitions in WordNet
n. an antagonist for estrogen that is used in the treatment of breast cancer [syn: estrogen antagonist ]

Usage examples of tamoxifen.

As each February day dawns colder and grayer than the last, Anna sinks into worries and depression, exhausted from neuropathy pain and hot flashes that remain months after stopping Taxol and tamoxifen.

A 1998 landmark study found that the use of tamoxifen in such women, who have no cancer but a family history of cancer or precancerous lesions, reduces the rate of expected breast cancers by 45 percent.