Open Access

DNA methylation of the p14ARF, RASSF1A and APC1A genes as an independent prognostic factor in colorectal cancer patients

  • Authors:
    • Torbjörn K. Nilsson
    • Zarah M. Löf-Öhlin
    • Xiao-Feng Sun
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  • Published online on: October 30, 2012     https://doi.org/10.3892/ijo.2012.1682
  • Pages: 127-133
  • Copyright: © Nilsson et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].

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Abstract

We quantitated the methylated fraction of CpG sites in the promoter regions of O6-MGMT, p14ARF, p16INK4a, RASSF1A and APC1A in tumor tissue from patients with colorectal cancer (CRC) in order to determine if promoter hypermethylation of any of these genes predicts survival. DNA was isolated from 111 primary CRC and 46 matched normal colorectal mucosa samples from the same patients, obtained at primary surgery and DNA methylation was examined by Pyrosequencing®. Follow-up time was up to 20 years. Patients showed partial promoter methylation in the following frequencies: O6-MGMT, 34%; p14ARF, 29%; p16INK4a, 28%; RASSF1A, 14%; and APC1A, 27%. Normal mucosa was always unmethylated. CRC patients with methylated p14ARF gene promoter had significantly worse prognosis (p=0.036), whereas those with methylated O6-MGMT had significantly better prognosis through the first 60 months post-treatment (RR 0.36; p=0.023). Methylation of one or more of the genes from the set p14ARF, RASSF1A and APC1A, was significantly (p=0.021) associated with worse prognosis even adjusting for tumor stage and differentiation (RR 2.2, p=0.037). Thus, DNA methylation of the p14ARF, RASSF1A and APC1A genes, diagnosed by Pyrosequencing, defines a poor prognosis subset of CRC patients independently of both tumor stage and differentiation. O6-MGMT methylation may play a protective role.
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January 2013
Volume 42 Issue 1

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Spandidos Publications style
Nilsson TK, Löf-Öhlin ZM and Sun X: DNA methylation of the p14ARF, RASSF1A and APC1A genes as an independent prognostic factor in colorectal cancer patients. Int J Oncol 42: 127-133, 2013
APA
Nilsson, T.K., Löf-Öhlin, Z.M., & Sun, X. (2013). DNA methylation of the p14ARF, RASSF1A and APC1A genes as an independent prognostic factor in colorectal cancer patients. International Journal of Oncology, 42, 127-133. https://doi.org/10.3892/ijo.2012.1682
MLA
Nilsson, T. K., Löf-Öhlin, Z. M., Sun, X."DNA methylation of the p14ARF, RASSF1A and APC1A genes as an independent prognostic factor in colorectal cancer patients". International Journal of Oncology 42.1 (2013): 127-133.
Chicago
Nilsson, T. K., Löf-Öhlin, Z. M., Sun, X."DNA methylation of the p14ARF, RASSF1A and APC1A genes as an independent prognostic factor in colorectal cancer patients". International Journal of Oncology 42, no. 1 (2013): 127-133. https://doi.org/10.3892/ijo.2012.1682