Abstract
The complex role of drug metabolism-related enzymes and their possible influence in cancer development, treatment and outcome has not yet been completely elucidated. There is evidence that these enzymes can activate certain environmental procarcinogens to more toxic derivatives and thus a role has been proposed for them in carcinogenesis. The fact that they can also inactivate a number of chemotherapeutic drugs has raised the possibility of these enzymes influencing the sensitivity of tumour cells to anticancer agents. In this report, we analyse the expression of drug metabolism-related genes within a whole genome microarray study of 104 breast cancer and 17 normal breast specimens. Kaplan–Meier survival curves, Chi-squared, and Cox Regression analyses were used to identify associations between expression of gene transcripts and patients’ clinicopathological and survival data. Our results show that several of these genes are significantly expressed in both normal and tumour tissue; in many cases, expression is altered in the tumour specimens as compared to normal breast tissue. Moreover, expression of ARNT2 and GST A1 was correlated with prognosis. Kaplan–Meier analysis showed expression of ARNT2 mRNA to correlate significantly with favourable disease outcome for patients, in terms of both their disease-free survival (P = 0.0094) and overall survival (P = 0.0018) times from diagnosis, while detection of GST A1 mRNA correlated with shortened disease-free survival (P = 0.0131) and overall survival (P = 0.0028). Multivariate analysis indicated GST A1 expression to be an independent prognostic factor for overall survival (P = 0.045). Our results suggest a possible use of ARNT2 and GST A1 as prognostic breast cancer biomarkers.
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Acknowledgments
This work was supported by funding from Ireland’s Higher Educational Authority Programme for Research in Third Level Institutions (PRTLI) Cycle 3, equipment funding from Science Foundation Ireland, Dublin City University’s Albert College Fellowship, Dublin City University’s Research Fellowship, and the Health Research Board.
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V. Martinez and S. Kennedy contributed equally.
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Martinez, V., Kennedy, S., Doolan, P. et al. Drug metabolism-related genes as potential biomarkers: analysis of expression in normal and tumour breast tissue. Breast Cancer Res Treat 110, 521–530 (2008). https://doi.org/10.1007/s10549-007-9739-9
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DOI: https://doi.org/10.1007/s10549-007-9739-9