Effect of promoter methylation of multidrug resistance 1 (MDR1) gene in gastric carcinogenesis

Tomomitsu Tahara, Tomiyasu Arisawa, Tomoyuki Shibata, Hiromi Yamashita, Daisuke Yoshioka, Ichiro Hirata

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Background: The altered expression of multidrug resistance 1 (MDR1) contributes to various types of carcinogenesis and their disease progression. Hypermethylation of CpG islands located in the promoter regions is involved in gene silencing at the transcriptional level. The methylotion status of MDR1 gene promoter was investigated in gastric cancer in relation to various clinicopathological features. Patients and Methods: The methylation of the MDR1 promoter was estimated in both antral non-neoplastic mucosa and cancer lesions in 83 patients with gastric cancer using a methylation-specific PCR method. Results: The methylation ratio (MR) of the cancer lesions (31.3±20.5) was significantly higher than that of non non-neoplastic mucosa (20.9±31.3, p=0.0004). The MR was especially high in Lauren's intestinal cancer (p<0.0001). A higher MR was also observed in more advanced stage (p=0.005) and lymph vessel invasion-positive cases (p=0.002). Conclusion: The promoter methylation of MDR1 seems to have a significant role in carcinogenesis and tumor progression in the stomach.

Original languageEnglish
Pages (from-to)337-341
Number of pages5
JournalAnticancer research
Issue number1
Publication statusPublished - 01-2009

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research


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