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GSK plc brands
Etacstil
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    Etacstil

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    Etacstil
    Etacstil skeletal.svg
    Identifiers
    • (2E)-3-{4-[(1Z)-1,2-Diphenyl-1-buten-1-yl]phenyl}acrylic acid
    CAS Number
    PubChem CID
    ChemSpider
    UNII
    ChEMBL
    Chemical and physical data
    Formula C25H22O2
    Molar mass 354.449 g·mol−1
    3D model (JSmol)
    • CC/C(=C(\c1ccccc1)/c2ccc(cc2)/C=C/C(=O)O)/c3ccccc3
    • InChI=1S/C25H22O2/c1-2-23(20-9-5-3-6-10-20)25(21-11-7-4-8-12-21)22-16-13-19(14-17-22)15-18-24(26)27/h3-18H,2H2,1H3,(H,26,27)/b18-15+,25-23-
    • Key:HJQQVNIORAQATK-DDJBQNAASA-N

    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).

    Etacstil was developed in the early 1990s by Duke University, Glaxo Wellcome, and later, Dupont. In 2001, Bristol Myers-Squibb (BMS) acquired Dupont, and for non-scientific, corporate reasons, closed the trial and abandoned the release of etacstil and its metabolite GW-7604.

    After many dormant years, a recent resurgence of interest in SERDs has led to the development of brilanestrant, a structural analogue of etacstil.

    See also


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