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Breast Cancer Research and Treatment
Published in: Breast Cancer Research and Treatment 2/2011

01-11-2011 | Preclinical study

Gene expression profiling of luminal B breast cancers reveals NHERF1 as a new marker of endocrine resistance

Authors: Thomas Karn, Eugen Ruckhäberle, Lars Hanker, Volkmar Müller, Marcus Schmidt, Christine Solbach, Regine Gätje, Mathias Gehrmann, Uwe Holtrich, Manfred Kaufmann, Achim Rody

Published in: Breast Cancer Research and Treatment | Issue 2/2011

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Abstract

The luminal B subtype represents a group of high proliferating estrogen receptor positive breast cancers which are associated with a poor prognosis. Genes exclusively expressed in this subtype should help to better understand these tumors. In a finding cohort of 171 breast cancers luminal B specific genes were identified displaying strong expression in highly proliferating Ki-67 positive/ER positive tumors but no expression either in Ki-67 negative/ER positive or in Ki-67 positive/ER negative samples. The clinical relevance of the scaffold protein NHERF1 identified by this strategy was assessed in a total of 3,030 breast cancers. NHERF1 expression was associated with the luminal B subtype both in the finding and validation cohort. A positive correlation of NHERF1 expression with tumor size (P < 0.001), grade (P < 0.001), and HER2 status (P = 0.033) was observed. NHERF1 expression was associated with a worse survival in ER positive breast cancer (P < 0.001) and retained its prognostic value in multivariate analysis. For ER positive samples with low NHERF1 expression a benefit of endocrine therapy was detected (P = 0.007). In contrast no differences in disease free survival were found for high NHERF1 expressing breast cancers which were either treated with endocrine therapy or no systemic therapy. Our data indicate that NHERF1 expressing breast cancers seem to have a greater risk to develop resistance to endocrine therapy. However, based on previous findings of NHERF1 functioning in PI3K signalling from basic research, these tumors might be appropriate candidates for a targeted therapy of the PI3K/Akt pathway.
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Metadata
Title
Gene expression profiling of luminal B breast cancers reveals NHERF1 as a new marker of endocrine resistance
Authors
Thomas Karn
Eugen Ruckhäberle
Lars Hanker
Volkmar Müller
Marcus Schmidt
Christine Solbach
Regine Gätje
Mathias Gehrmann
Uwe Holtrich
Manfred Kaufmann
Achim Rody
Publication date
01-11-2011
Publisher
Springer US
Published in
Breast Cancer Research and Treatment / Issue 2/2011
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-010-1333-x

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