Abstract
Purpose
Multidrug resistance (MDR) has been linked to sphingolipid metabolism and preclinical data ascribe glucosylceramide synthase (GCS) a major role for MDR especially in breast cancer cells but no profound data are available on the expression of this potential therapeutic target in clinical breast cancer specimens.
Methods
We analyzed microarray data of GCS expression in a large cohort of 1,681 breast tumors.
Results
Expression of GCS was associated with a positive estrogen receptor (ER) status, lower histological grading, low Ki67 levels and ErbB2 negativity (P < 0.001 for all). In univariate analysis there was a benefit for disease free survival for patients with tumors displaying low levels of GCS expression but this significance was lost in multivariate Cox regression.
Conclusions
Our results suggest ER positive tumors may be the most promising candidates for a potential therapeutic application of GCS inhibitors.
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Acknowledgments
We thank Samira Adel and Katherina Kourtis for expert technical assistance. This work was supported by grants from the Deutsche Krebshilfe, the Margarete Bonifer-Stiftung, Bad Soden, the Dr. Robert Pfleger-Stiftung, Bamberg, and the BANSS-Stiftung, Biedenkopf.
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The funding sources were not involved in the study design, in the collection, analysis, and interpretation of data; in the writing of the manuscript; and in the decision to submit the manuscript for publication.
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Eugen Ruckhäberle and Thomas Karn contributed equally to this work.
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Ruckhäberle, E., Karn, T., Hanker, L. et al. Prognostic relevance of glucosylceramide synthase (GCS) expression in breast cancer. J Cancer Res Clin Oncol 135, 81–90 (2009). https://doi.org/10.1007/s00432-008-0436-9
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DOI: https://doi.org/10.1007/s00432-008-0436-9