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• W3105282488 abstract "Abstract Mutations in ESR1 that confer constitutive estrogen receptor alpha (ER) activity in the absence of ligand are acquired by ≥40% of metastatic breast cancers (MBC) resistant to adjuvant aromatase inhibitor (AI) therapy. To identify targetable vulnerabilities in MBC, we examined steroid hormone receptors and tumor-infiltrating immune cells in metastatic lesions with or without ER mutations. ER and progesterone receptor (PR) were significantly lower in metastases with wild-type (WT) ER compared with those with mutant ER, suggesting that metastases that evade AI therapy by mechanism(s) other than acquiring ER mutations lose dependency on ER and PR. Metastases with mutant ER had significantly higher T regulatory and Th cells, total macrophages, and programmed death ligand-1 (PD-L1)-positive immune-suppressive macrophages than those with WT ER. Breast cancer cells with CRISPR-Cas9–edited ER (D538G, Y537S, or WT) and patient-derived xenografts harboring mutant or WT ER revealed genes and proteins elevated in mutant ER cells, including androgen receptor (AR), chitinase-3-like protein 1 (CHI3L1), and IFN-stimulated genes (ISG). Targeting these proteins blunted the selective advantage of ER-mutant tumor cells to survive estrogen deprivation, anchorage independence, and invasion. Thus, patients with mutant ER MBC might respond to standard-of-care fulvestrant or other selective ER degraders when combined with AR or CHI3L1 inhibition, perhaps with the addition of immunotherapy. Significance: Targetable alterations in MBC, including AR, CHI3L1, and ISG, arise following estrogen-deprivation, and ER-mutant metastases may respond to immunotherapies due to elevated PD-L1+ macrophages. See related article by Arnesen et al., p. 539" @default.
• W3105282488 created "2020-11-23" @default.
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• W3105282488 date "2021-02-01" @default.
• W3105282488 modified "2023-10-11" @default.
• W3105282488 title "Steroid Hormone Receptor and Infiltrating Immune Cell Status Reveals Therapeutic Vulnerabilities of <i>ESR1</i>-Mutant Breast Cancer" @default.
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• W3105282488 doi "https://doi.org/10.1158/0008-5472.can-20-1200" @default.
• W3105282488 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7854521" @default.
• W3105282488 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33184106" @default.
• W3105282488 hasPublicationYear "2021" @default.
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