Abstract
Purpose
The identification of molecular biomarkers for classification of breast cancer is needed to better stratify the patients and guide therapeutic decisions. The aim of this study was to investigate the value of MAPRE1 gene encoding microtubule-end binding proteins EB1 as a biomarker in breast cancer and evaluate whether combinatorial expression of MAPRE1 and MTUS1 gene encoding EB1-negative regulator ATIP3 may improve breast cancer diagnosis and prognosis.
Methods
Probeset intensities for MAPRE1 and MTUS1 genes were retrieved from Exonhit splice array analyses of 45 benign and 120 malignant breast tumors for diagnostic purposes. Transcriptomic analyses (U133 Affymetrix array) of one exploratory cohort of 150 invasive breast cancer patients and two independent series of 130 and 155 samples were compared with clinical data of the patients for prognostic studies. A tissue microarray from an independent cohort of 212 invasive breast tumors was immunostained with anti-EB1 and anti-ATIP3 antibodies.
Results
We show that MAPRE1 gene is a diagnostic and prognostic biomarker in breast cancer. High MAPRE1 levels correlate with tumor malignancy, high histological grade and poor clinical outcome. Combination of high-MAPRE1 and low-MTUS1 levels in tumors is significantly associated with tumor aggressiveness and reduced patient survival. IHC studies of combined EB1/ATIP3 protein expression confirmed these results.
Conclusions
These studies emphasize the importance of studying combinatorial expression of EB1 and ATIP3 genes and proteins rather than each biomarker alone. A population of highly aggressive breast tumors expressing high-EB1/low-ATIP3 may be considered for the development of new molecular therapies.
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Acknowledgements
We wish to thank Dr Céline Lefebvre for helpful discussion and Nicolas Signolle and Ibrahim Bouakka for excellent assistance. This work was supported by the INSERM, the CNRS, the University Paris-Saclay, the Institut Gustave Roussy, the A*MIDEX project (No. ANR-11-IDEX-0001-02) funded by the “Investissements d’Avenir” French Government program, managed by the ANR and ITMO Cancer AVIESAN as part of the Cancer Plan No. PC201419, the Labex LERMIT, the Fondation ARC pour la Recherche contre le Cancer, the Ligue Nationale Contre le Cancer, the association Odyssea, GEFLUC and Prolific.
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This article does not contain any studies with animals performed by any of the authors. All procedures used in studies involving human participants have been previously published elsewhere and were in accordance with ethical standards of the Institut Curie and Gustave Roussy committees, and with 1964 Helsinki declaration.
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Rodrigues-Ferreira, S., Nehlig, A., Monchecourt, C. et al. Combinatorial expression of microtubule-associated EB1 and ATIP3 biomarkers improves breast cancer prognosis. Breast Cancer Res Treat 173, 573–583 (2019). https://doi.org/10.1007/s10549-018-5026-1
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DOI: https://doi.org/10.1007/s10549-018-5026-1