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3082 Etacstil
7a08467b880cfcb48f396521d319cda387ffef95f93a1ec74d0a117132bde93e

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Etacstil (developmental code names GW-5638, DPC974) is an orally active, nonsteroidal, combined selective estrogen receptor modulator (SERM) and selective estrogen receptor degrader (SERD) that was developed for the treatment of estrogen receptor-positive breast cancer. It was shown to overcome antiestrogen (tamoxifen, aromatase inhibitor, fulvestrant) resistance in breast cancer by altering the shape of the estrogen receptor, thus exhibiting SERD properties. Etacstil is a tamoxifen derivative and one of the first drugs to overcome tamoxifen-resistance. It is the predecessor of GW-7604, of which etacstil is a prodrug (GW-7604 being the 4-hydroxy metabolite of etacstil). This is analogous to the case of tamoxifen being a prodrug of afimoxifene (4-hydroxytamoxifen).

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