Dipeptidase 1 (DPEP1) is a marker for the transition from low-grade to 
high-grade intraepithelial neoplasia and an adverse prognostic factor in 
colorectal cancer

Eisenach, P. A.; Soeth, E.; Roeder, C.; Kloeppel, G.; Tepel, J.; Kalthoff, H.; Sipos, B.

doi:10.1038/bjc.2013.363

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Dipeptidase 1 (DPEP1) is a marker for the transition from low-grade to high-grade intraepithelial neoplasia and an adverse prognostic factor in colorectal cancer

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Eisenach, P. A.
Fässler, Reinhard / Molecular Medicine, Max Planck Institute of Biochemistry, Max Planck Society;

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Citation

Eisenach, P. A., Soeth, E., Roeder, C., Kloeppel, G., Tepel, J., Kalthoff, H., et al. (2013). Dipeptidase 1 (DPEP1) is a marker for the transition from low-grade to high-grade intraepithelial neoplasia and an adverse prognostic factor in colorectal cancer. BRITISH JOURNAL OF CANCER, 109(3), 694-703. doi:10.1038/bjc.2013.363.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0014-4EC2-9

Abstract

Background: Colorectal cancer (CRC) is the second leading cause of cancer-related deaths worldwide. Improvements in the understanding of its molecular mechanism and the characterisation of CRC-specific biomarkers facilitating early detection are considered to increase overall survival. Methods: A meta-analysis of microarray and Serial Analysis of Gene Expression (SAGE) has been performed to identify differentially regulated genes in CRC. Dipeptidase 1 (DPEP1/MDP/RDP) and Syntenin-2 (SDCBP2/SITAC18) were found to be differentially expressed in tumour tissue compared with normal mucosa. Expression of DPEP1 was assessed in a validation set of 87 normal mucosa samples, 20 hyperplastic polyps, 46 CR adenomas with low-and high-grade intraepithelial neoplasia (IEN) and 217 well-documented CRCs by immunohistochemistry and partially by immunoblotting and real-time PCR. Results: Expression of DPEP1 was specifically increased in human CRC tissue samples compared with normal mucosa (P<0.0001, Mann-Whitney U-test), showing a striking upregulation in high-grade compared with low-grade IEN. Furthermore, high DPEP1 expression was found to strongly correlate with histological stage (P<0.0001, chi-square test) as well as localisation (P<0.0001, chi-square test) and has been recognised as an independent adverse prognostic factor, showing significant prognostic values with an ROC (receiver operating characteristic)-AUC of 0.9230. Conclusion: Dipeptidase 1 has been identified as an excellent marker of high-grade IEN and CRC, and may thus be applied for screening of early neoplastic lesions and for prognostic stratification.