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Updated: Jan 30, 2026

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Targeting mutant estrogen receptors

Suzanne E Wardell1, John D Norris1, Donald P McDonnell1

  • 1Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, United States.

Elife
|January 17, 2019
PubMed

Insights

A hormone replacement therapy drug effectively targets estrogen receptors resistant to breast cancer treatments. This finding offers new hope for patients with advanced or treatment-resistant estrogen receptor-positive breast cancer.

Area of Science:

  • Endocrinology
  • Oncology
  • Pharmacology

Background:

  • Estrogen receptors (ERs) are crucial in many breast cancers.
  • Resistance to endocrine therapies targeting ERs is a major clinical challenge.
  • Novel therapeutic strategies are needed for ER-positive breast cancer that has become resistant.

Purpose of the Study:

  • To investigate a hormone replacement therapy drug's efficacy against estrogen receptors resistant to standard breast cancer treatments.
  • To evaluate the drug's potential to overcome endocrine resistance in ER-positive breast cancer models.

Main Methods:

  • Utilized cell-based assays to assess drug activity on resistant ER variants.
  • Employed molecular biology techniques to analyze drug-target interactions.
  • Conducted preclinical studies to evaluate therapeutic potential.

Main Results:

  • The hormone replacement therapy drug demonstrated significant activity against estrogen receptors exhibiting resistance mechanisms.
  • The drug successfully inhibited proliferation in cancer cells with acquired endocrine resistance.
  • Specific molecular pathways modulated by the drug in resistant cells were identified.

Conclusions:

  • This hormone replacement therapy drug shows promise as a novel therapeutic agent for endocrine-resistant ER-positive breast cancer.
  • Targeting resistant estrogen receptors with this drug could offer a new treatment avenue.
  • Further clinical investigation is warranted to confirm its safety and efficacy in patients.
Keywords:
SERM/SERDacquired drug resistancebazedoxifenebreast cancercancer biologyestrogen receptorhormone therapyhuman

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