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Published in: Breast Cancer Research and Treatment 1/2012

01-02-2012 | Preclinical Study

Insulin-like growth factor receptor (IGF-1R) in breast cancer subtypes

Authors: Rinat Yerushalmi, Karen A. Gelmon, Samuel Leung, Dongxia Gao, Maggie Cheang, Michael Pollak, Gulisa Turashvili, Blakes C. Gilks, Hagen Kennecke

Published in: Breast Cancer Research and Treatment | Issue 1/2012

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Abstract

Insulin-like growth factor-1 receptor (IGF-1R) is expressed in normal and malignant breast tissue and has been implicated in cell survival and resistance to cytotoxic therapies. We sought to assess the prognostic impact of IGF-1R expression among patients with early breast cancer and among breast cancer subtypes. Patients with stages I–III breast cancer with archival tumor tissue were included. Paraffin tissue blocks were used to construct a tissue microarray that was stained for ER, PR, Ki-67, HER2, EGFR, and cytokeratins 5/6 to classify the breast subgroups and for expression of IGF-1R, p27, and Bcl2 by immunohistochemistry. Kaplan–Meier plots were created by subtypes. Associations between IGF-1R and prognostic variables were examined in multivariate analysis. Among 2,871 eligible women the prognostic cut point for IGF-1R expression for breast-cancer-specific survival (BCSS) was Allred score <7 versus ≥7. IGF-1R was ≥7 in 52% (LuminalA), 57.5% (LuminalB), 44.8% (LuminalHER2), 9.7% HER2-enriched, and 22.5% (Basal-like), P = 1.3 × 10−52. IGF-1R+ was associated with age ≥50, lower histopathology grade, ER+, HER2 negativity (−), high p27 and high Bcl2 score. IGF-1R ≥7 was associated with better BCSS among LuminalB patients, hazard ratio = 0.64 (0.49–0.84); P = 1.2 × 10−3, and worse outcome in the HER2-enriched subtype, hazard ratio = 2.37 (1.21–4.64); P = 0.012. IGF-1R correlates with good prognostic markers among patients with early breast cancer and is differentially expressed with variable prognostic impact among breast cancer subtypes. Results may have relevance to the development of therapeutics targeting IGF-1R.
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Metadata
Title
Insulin-like growth factor receptor (IGF-1R) in breast cancer subtypes
Authors
Rinat Yerushalmi
Karen A. Gelmon
Samuel Leung
Dongxia Gao
Maggie Cheang
Michael Pollak
Gulisa Turashvili
Blakes C. Gilks
Hagen Kennecke
Publication date
01-02-2012
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 1/2012
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-011-1529-8

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Breast Cancer Research and Treatment 1/2012 Go to the issue
Webinar | 19-02-2024 | 17:30 (CET)

Keynote webinar | Spotlight on antibody–drug conjugates in cancer

Antibody–drug conjugates (ADCs) are novel agents that have shown promise across multiple tumor types. Explore the current landscape of ADCs in breast and lung cancer with our experts, and gain insights into the mechanism of action, key clinical trials data, existing challenges, and future directions.

Dr. Véronique Diéras
Prof. Fabrice Barlesi
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