Global DNA methylation and tumor suppressor gene promoter methylation and gastric cancer risk in an Omani Arab population

Jennifer A. Rusiecki, Maryam Al-Nabhani, Letizia Tarantini, Ligong Chen, Andrea Baccarelli, Mansour S. Al-Moundhri

Research output: Contribution to journalArticle

12 Citations (Scopus)


Aim: We carried out a case-control study in an Omani Arab population to investigate the association between gastric cancer and peripheral blood leukocyte DNA methylation in LINE-1 and in the tumor suppressor genes CDH1, p16, TP53 and RUNX3. Materials & methods: We quantified methylation (%5-mC) in DNA extracted from peripheral blood leukocytes via pyrosequencing. We calculated odds ratios (ORs) and 95% CIs using logistic regression. Results: We found patterns of global hypomethylation (LINE-1: OR continuous = 0.59; 95% CI: 0.42-0.82) and TP53 promoter hypomethylation (OR continuous = 0.64; 95% CI: 0.16-0.85) for cases versus controls; p16 promoter region hypomethylation was not statistically significant. Evaluating LINE-1, TP53 and p16 jointly yielded a more pronounced negative association with gastric cancer (OR: 0.24; 95% CI: 0.09-0.66). Age was a significant effect modifier. We found no differences by tumor grade, stage or histology. Conclusion: We found a pattern of global hypomethylation and promoter region hypomethylation of TP53 and p16 in cases versus controls for this population of Omani Arabs.

Original languageEnglish
Pages (from-to)417-429
Number of pages13
Issue number4
Publication statusPublished - Aug 1 2011



  • DNA methylation
  • epigenetics
  • gastric carcinoma
  • Oman
  • tumor suppressor genes

ASJC Scopus subject areas

  • Genetics
  • Cancer Research

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