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DNA methylation of apoptosis genes in rectal cancer predicts patient survival and tumor recurrence

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Abstract

Deregulation of the apoptotic pathway, one of the hallmarks of tumor growth and -progression, has been shown to have prognostic value for tumor recurrence in rectal cancer. In order to develop clinically relevant biomarkers, we studied the methylation status of promoter regions of key apoptosis genes in rectal cancer patients, using methylation-sensitive restriction enzymes. DNA was extracted from fresh-frozen tumor tissues of 49 stage I-III rectal cancer patients and 10 normal rectal tissues. The results of this pilot study were validated in 88 stage III tumor tissues and 18 normal rectal tissues. We found that methylation of the intrinsic apoptotic pathway genes Apaf1, Bcl2 and p53 correlated with the apoptotic status (M30) of the tumor. Combined survival analyses of these three genes, based on the number of genes showing high methylation (all low, 1 high, 2 high or all high), showed shorter patient survival and recurrence-free periods with an increasing number of methylated markers. Multivariate analyses showed significant differences for overall survival (p = 0.01; HR = 0.28 (0.09–0.83)), cancer-specific survival (p = 0.004; HR = 0.13 (0.03–0.67)) and distant recurrence-free survival (p = 0.001; HR = 0.22(0.05–0.94)). The shortest survival was observed for patients showing low methylation of all markers, which—as was expected—correlated with high apoptosis (M30), but also with high proliferation (Ki-67). The study of epigenetic regulation of apoptosis genes provides more insight in the tumorigenic process in rectal cancer and might be helpful in further refining treatment regimens for individual patients.

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Abbreviations

TME:

Total mesorectal excision

TNM:

Tumor node metastasis

IHC:

Immunohistochemistry

OS:

Overall survival

CSS:

Cancer-specific survival

LRFS:

Local recurrence-free survival

DRFS:

Distant recurrence-free survival

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Acknowledgments

This study was funded by the Sacha Swarttouw-Hijmans Fund (The Netherlands), KWF (Dutch Cancer Society, The Netherlands), Collegium Chirurgicum Neerlandicum (The Netherlands) and the Leiden University Fund (LUF, The Netherlands). This work was also supported by Grant Number 1R01CA171767-01A1 from the National Institute of Health, National Cancer Institute (USA, DSBH) and the Ruth and Martin H Weil Fund (Los Angeles, CA; DSBH).

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The authors declare that that they have no competing interests to disclose.

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Correspondence to Peter J. K. Kuppen.

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Anne Benard and Eliane C.M. Zeestraten contributed equally to this work. Dave S.B. Hoon and Peter J.K. Kuppen share the senior authorship.

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Benard, A., Zeestraten, E.C.M., Goossens-Beumer, I.J. et al. DNA methylation of apoptosis genes in rectal cancer predicts patient survival and tumor recurrence. Apoptosis 19, 1581–1593 (2014). https://doi.org/10.1007/s10495-014-1022-z

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