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Hypermethylation of the MYOD1 gene is a novel prognostic factor in patients with colorectal cancer

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MYOD1 promoter methylation occurs in various malignancies including colorectal cancer. We analyzed MYOD1 methylation in 80 colorectal cancer and 74 adjacent normal tissues using MethyLight, which enabled quantitative DNA methylation analysis. The measured methylation value was expressed as a percentage of methylated reference (PMR). The results were compared with clinicopathological features and patient prognosis in order to investigate whether MYOD1 methylation may serve as an independent prognostic factor of colorectal cancer. MYOD1 promoter methylation was detectable in all samples and was significantly higher in tumor compared to normal mucosa, where the median level of methylation was 5.3 PMR (range 0.03-133.4) in normal mucosa and 42.3 PMR (range 0.44-742.9) in tumor. The methylation value of MYOD1 was higher with elder patients both in normal colonic mucosa (p=0.034) and in cancer tissues (p=0.0012). Patients without MYOD1 hypermethylation showed significantly longer survival than those with hypermethylation (p=0.0077). In multivariate analysis of prognostic factors, MYOD1 hypermethylation was a significant prognostic factor (p=0.015) independent to patients' age. These results suggest that MYOD1 hypermethylation plays an important role in colorectal cancer and may be a novel prognostic factor. In addition, quantitative methylation analysis by MethyLight is encouraged for other genes showing age-related and non-cancer-specific methylation.
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Document Type: Research Article

Affiliations: Department of Surgery, Kanazawa University School of Medicine, Kanazawa, Ishikawa 920-8641, Japan

Publication date: March 1, 2004

More about this publication?
  • The International Journal of Molecular Medicine is a monthly, peer-reviewed journal devoted to the publication of high quality studies related to the molecular mechanisms of human disease. The journal welcomes research on all aspects of molecular and clinical research, ranging from biochemistry to immunology, pathology, genetics, human genomics, microbiology, molecular pathogenesis, molecular cardiology, molecular surgery and molecular psychology.

    The International Journal of Molecular Medicine aims to provide an insight for researchers within the community in regard to developing molecular tools and identifying molecular targets for the diagnosis and treatment of a diverse number of human diseases.
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