Abstract
Purpose: Breast cancer affects both genders, but is understudied in men. Although still rare, male breast cancer (MBC) is being diagnosed more frequently. Treatments are wholly informed by clinical studies conducted in women, based on assumptions that underlying biology is similar.Experimental Design: A transcriptomic investigation of male and female breast cancer was performed, confirming transcriptomic data in silico Biomarkers were immunohistochemically assessed in 697 MBCs (n = 477, training; n = 220, validation set) and quantified in pre- and posttreatment samples from an MBC patient receiving everolimus and PI3K/mTOR inhibitor.Results: Gender-specific gene expression patterns were identified. eIF transcripts were upregulated in MBC. eIF4E and eIF5 were negatively prognostic for overall survival alone (log-rank P = 0.013; HR = 1.77, 1.12-2.8 and P = 0.035; HR = 1.68, 1.03-2.74, respectively), or when coexpressed (P = 0.01; HR = 2.66, 1.26-5.63), confirmed in the validation set. This remained upon multivariate Cox regression analysis [eIF4E P = 0.016; HR = 2.38 (1.18-4.8), eIF5 P = 0.022; HR = 2.55 (1.14-5.7); coexpression P = 0.001; HR = 7.04 (2.22-22.26)]. Marked reduction in eIF4E and eIF5 expression was seen post BEZ235/everolimus, with extended survival.Conclusions: Translational initiation pathway inhibition could be of clinical utility in MBC patients overexpressing eIF4E and eIF5. With mTOR inhibitors that target this pathway now in the clinic, these biomarkers may represent new targets for therapeutic intervention, although further independent validation is required. Clin Cancer Res; 23(10); 2575-83. ©2016 AACR.
Original language | English |
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Pages (from-to) | 2575-2583 |
Number of pages | 9 |
Journal | Clinical Cancer Research |
Volume | 23 |
Issue number | 10 |
Early online date | 16 Dec 2016 |
DOIs | |
Publication status | Published - May 2017 |
Externally published | Yes |
Bibliographical note
This study was funded by Yorkshire Cancer Research (grant L278). Breast Cancer Now (formerly Breast Cancer Campaign, grant 2007MayPR02) provided funding for the accrual and construction of the MBC TMAs. The Breast Cancer Research Trust contributed toward costs of genomic analysis. This work was partially supported by grants from the Italian Association for Cancer Research and the Swedish Cancer Society.The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
Keywords
- Adult
- Aged
- Aged, 80 and over
- Biomarkers, Tumor
- Breast Neoplasms
- Breast Neoplasms, Male
- Disease-Free Survival
- Eukaryotic Initiation Factor-4E
- Everolimus
- Female
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Humans
- Imidazoles
- Male
- Middle Aged
- Peptide Initiation Factors
- Prognosis
- Quinolines
- RNA-Binding Proteins
- Sex Characteristics
- Transcriptome
- Journal Article
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Valerie Speirs
- School of Medicine, Medical Sciences & Nutrition, Molecular and Cellular Function
- School of Medicine, Medical Sciences & Nutrition, Medical Sciences - Chair in Molecular Oncology
- School of Medicine, Medical Sciences & Nutrition, Institute of Medical Sciences
- School of Medicine, Medical Sciences & Nutrition, Aberdeen Cancer Centre
Person: Academic