Adaptation to AI Therapy in Breast Cancer Can Induce Dynamic Alterations in ER Activity Resulting in Estrogen-Independent Metastatic Tumors

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
Damir VareslijaLeonie S Young

Abstract

Acquired resistance to aromatase inhibitor (AI) therapy is a major clinical problem in the treatment of breast cancer. The detailed mechanisms of how tumor cells develop this resistance remain unclear. Here, the adapted function of estrogen receptor (ER) to an estrogen-depleted environment following AI treatment is reported. Global ER chromatin immuno-precipitation (ChIP)-seq analysis of AI-resistant cells identified steroid-independent ER target genes. Matched patient tumor samples, collected before and after AI treatment, were used to assess ER activity. Maintained ER activity was observed in patient tumors following neoadjuvant AI therapy. Genome-wide ER-DNA-binding analysis in AI-resistant cell lines identified a subset of classic ligand-dependent ER target genes that develop steroid independence. The Kaplan-Meier analysis revealed a significant association between tumors, which fail to decrease this steroid-independent ER target gene set in response to neoadjuvant AI therapy, and poor disease-free survival and overall survival (n = 72 matched patient tumor samples, P = 0.00339 and 0.00155, respectively). The adaptive ER response to AI treatment was highlighted by the ER/AIB1 target gene, early growth response 3 (EGR3). Ele...Continue Reading

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Citations

Jul 3, 2018·Journal of the National Cancer Institute·Damir VarešlijaLeonie S Young
May 26, 2017·Physiological Reviews·Jean-Francois ArnalJohn Katzenellenbogen
Jun 11, 2020·Scientific Reports·Arnon Møldrup KnudsenBjarne Winther Kristensen
Dec 17, 2016·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Rachel C JankowitzNancy E Davidson
Mar 24, 2018·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Elspeth WardLeonie S Young
Nov 20, 2020·BMC Medicine·Sara CharmsazLeonie S Young
Oct 9, 2021·British Journal of Cancer·Sarah K Herzog, Suzanne A W Fuqua

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