Abstract
Breast cancer epithelial cells with the CD44+/CD24−/low phenotype possess tumor-initiating cells and epithelial-mesenchymal transition (EMT) capacity. Massive parallel sequencing can be an interesting approach to deepen the molecular characterization of these cells. We characterized CD44+/CD24−/cytokeratin(Ck)+/CD45− cells isolated through flow cytometry from 43 biopsy and 6 mastectomy samples harboring different benign and malignant breast lesions. The Ion Torrent Ampliseq Cancer Hotspot panel v2 (CHPv2) was used for the identification of somatic mutations in the DNA extracted from isolated CD44+/CD24−/Ck+/CD45− cells. E-Cadherin and vimentin immunohistochemistry was performed on sections from the corresponding formalin-fixed, paraffin-embedded (FFPE) blocks. The percentage of CD44+/CD24−/Ck+/CD45− cells increased significantly from non-malignant to malignant lesions and in association with a significant increase in the expression of vimentin. Non-malignant lesions harbored only a single-nucleotide polymorphism (SNP). Mutations in the tumor suppressor p53 (TP53), NOTCH homolog 1 (NOTCH1), phosphatase and tensin homolog (PTEN), and v-akt murine thymoma viral oncogene homolog 1 (AKT1) genes were found in isolated CD44+/CD24−/Ck+/CD45− cells from ductal carcinomas in situ (DCIS). Additional mutations in the colony-stimulating factor 1 receptor (CSF1R), ret proto-oncogene (RET), and TP53 genes were also identified in invasive ductal carcinomas (IDCs). The use of massive parallel sequencing technology for this type of application revealed to be extremely effective even when using small amounts of DNA extracted from a low number of cells. Additional studies are now required using larger cohorts to design an appropriate mutational profile for this phenotype.
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Acknowledgments
This study was funded by the Foundation for Science and Technology (Portugal). Scholarships references: SFRH/BD/74307/2010 (ACP) and SFRH/BD/2011/78184 (OM). The authors would like to thank the invaluable help of Manuela Certo and Maria José Oliveira during breast tissue collection.
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This project was approved by the following ethical boards: Porto Hospital Centre Research Ethics Health Committee (reference 203-CES) and by Porto Hospital Centre Department of Education, Development and Research (reference 135-DEFI).
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The authors declare that they have no conflict of interest.
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Margarida Lima and Carlos Lopes contributed equally to the supervision of this work.
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Da Cruz Paula, A., Leitão, C., Marques, O. et al. Molecular characterization of CD44+/CD24−/Ck+/CD45− cells in benign and malignant breast lesions. Virchows Arch 470, 311–322 (2017). https://doi.org/10.1007/s00428-017-2068-4
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DOI: https://doi.org/10.1007/s00428-017-2068-4