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Cell Rep. 2013 Sep 26;4(6):1116-30. doi: 10.1016/j.celrep.2013.08.022. Epub 2013 Sep 19.

Endocrine-therapy-resistant ESR1 variants revealed by genomic characterization of breast-cancer-derived xenografts.

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1
Section of Breast Oncology, Division of Oncology, Department of Internal Medicine, Washington University in St. Louis, St. Louis, MO 63110, USA; Siteman Cancer Center Breast Cancer Program, Washington University in St. Louis, St. Louis, MO 63110, USA.

Abstract

To characterize patient-derived xenografts (PDXs) for functional studies, we made whole-genome comparisons with originating breast cancers representative of the major intrinsic subtypes. Structural and copy number aberrations were found to be retained with high fidelity. However, at the single-nucleotide level, variable numbers of PDX-specific somatic events were documented, although they were only rarely functionally significant. Variant allele frequencies were often preserved in the PDXs, demonstrating that clonal representation can be transplantable. Estrogen-receptor-positive PDXs were associated with ESR1 ligand-binding-domain mutations, gene amplification, or an ESR1/YAP1 translocation. These events produced different endocrine-therapy-response phenotypes in human, cell line, and PDX endocrine-response studies. Hence, deeply sequenced PDX models are an important resource for the search for genome-forward treatment options and capture endocrine-drug-resistance etiologies that are not observed in standard cell lines. The originating tumor genome provides a benchmark for assessing genetic drift and clonal representation after transplantation.

PMID:
24055055
PMCID:
PMC3881975
DOI:
10.1016/j.celrep.2013.08.022
[Indexed for MEDLINE]
Free PMC Article

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