eLife (Jul 2016)

The selective estrogen receptor downregulator GDC-0810 is efficacious in diverse models of ER+ breast cancer

  • James D Joseph,
  • Beatrice Darimont,
  • Wei Zhou,
  • Alfonso Arrazate,
  • Amy Young,
  • Ellen Ingalla,
  • Kimberly Walter,
  • Robert A Blake,
  • Jim Nonomiya,
  • Zhengyu Guan,
  • Lorna Kategaya,
  • Steven P Govek,
  • Andiliy G Lai,
  • Mehmet Kahraman,
  • Dan Brigham,
  • John Sensintaffar,
  • Nhin Lu,
  • Gang Shao,
  • Jing Qian,
  • Kate Grillot,
  • Michael Moon,
  • Rene Prudente,
  • Eric Bischoff,
  • Kyoung-Jin Lee,
  • Celine Bonnefous,
  • Karensa L Douglas,
  • Jackaline D Julien,
  • Johnny Y Nagasawa,
  • Anna Aparicio,
  • Josh Kaufman,
  • Benjamin Haley,
  • Jennifer M Giltnane,
  • Ingrid E Wertz,
  • Mark R Lackner,
  • Michelle A Nannini,
  • Deepak Sampath,
  • Luis Schwarz,
  • Henry Charles Manning,
  • Mohammed Noor Tantawy,
  • Carlos L Arteaga,
  • Richard A Heyman,
  • Peter J Rix,
  • Lori Friedman,
  • Nicholas D Smith,
  • Ciara Metcalfe,
  • Jeffrey H Hager

DOI
https://doi.org/10.7554/eLife.15828
Journal volume & issue
Vol. 5

Abstract

Read online

ER-targeted therapeutics provide valuable treatment options for patients with ER+ breast cancer, however, current relapse and mortality rates emphasize the need for improved therapeutic strategies. The recent discovery of prevalent ESR1 mutations in relapsed tumors underscores a sustained reliance of advanced tumors on ERα signaling, and provides a strong rationale for continued targeting of ERα. Here we describe GDC-0810, a novel, non-steroidal, orally bioavailable selective ER downregulator (SERD), which was identified by prospectively optimizing ERα degradation, antagonism and pharmacokinetic properties. GDC-0810 induces a distinct ERα conformation, relative to that induced by currently approved therapeutics, suggesting a unique mechanism of action. GDC-0810 has robust in vitro and in vivo activity against a variety of human breast cancer cell lines and patient derived xenografts, including a tamoxifen-resistant model and those that harbor ERα mutations. GDC-0810 is currently being evaluated in Phase II clinical studies in women with ER+ breast cancer.

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