Yes*: Arimidex (anastrozole) belongs to a category of drugs called aromatase inhibitors. These are effective chemotherapeutic agents for people with either estrogen-sensitive or *progesterone-sensitive breast cancers. This is only effective after menopause; premenopausal women may use tamoxifen for a similar response rate.
Answered 6/24/2014
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Yes: This question is nicely answered by a free article from jco: http://jco.Ascopubs.Org/content/23/8/1636.Full neither Arimidex (anastrozole) nor tamoxifen seem to have much effect on receptor-negative breast cancer.
Answered 10/4/2016
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