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The SERM/SERD bazedoxifene disrupts ESR1 helix 12 to overcome acquired hormone resistance in breast cancer cells.

eLife | 2018

Acquired resistance to endocrine therapy remains a significant clinical burden for breast cancer patients. Somatic mutations in the ESR1 (estrogen receptor alpha (ERα)) gene ligand-binding domain (LBD) represent a recognized mechanism of acquired resistance. Antiestrogens with improved efficacy versus tamoxifen might overcome the resistant phenotype in ER +breast cancers. Bazedoxifene (BZA) is a potent antiestrogen that is clinically approved for use in hormone replacement therapies. We found that BZA possesses improved inhibitory potency against the Y537S and D538G ERα mutants compared to tamoxifen and has additional inhibitory activity in combination with the CDK4/6 inhibitor palbociclib. In addition, comprehensive biophysical and structural biology studies show BZA's selective estrogen receptor degrading (SERD) properties that override the stabilizing effects of the Y537S and D538G ERα mutations.

Pubmed ID: 30489256 RIS Download

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Associated grants

  • Agency: CIHR, Canada
  • Agency: NCI NIH HHS, United States
    Id: CCSG P30 CA08748
  • Agency: NCI NIH HHS, United States
    Id: K08 CA191058
  • Agency: NIH HHS, United States
    Id: R01CA220284
  • Agency: NCI NIH HHS, United States
    Id: P30 CA008748
  • Agency: NCI NIH HHS, United States
    Id: R01 CA204999
  • Agency: Susan G. Komen, United States
    Id: PDF14301382
  • Agency: NIGMS NIH HHS, United States
    Id: R35 GM124952
  • Agency: NIH HHS, United States
    Id: R01CA204999
  • Agency: NIH HHS, United States
    Id: R35GM124952

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