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CYP2E1 Genetic Polymorphism with Dietary, Tobacco, Alcohol Habits, H. pylori Infection Status and Susceptibility to Stomach Cancer in Mizoram, India

  • Malakar, Mridul (Regional Medical Research Centre, NE Region (Indian Council of Medical Research)) ;
  • Devi, K. Rekha (Regional Medical Research Centre, NE Region (Indian Council of Medical Research)) ;
  • Phukan, Rup Kumar (Regional Medical Research Centre, NE Region (Indian Council of Medical Research)) ;
  • Kaur, Tanvir (Indian Council of Medical Research) ;
  • Deka, Manab (Department of Biotechnology, Gauhati University) ;
  • Puia, Lalhriat (Hospital and Medical Education, Gauhati University) ;
  • Baruah, Debajit (Aizawl Endoscopy Centre) ;
  • Mahanta, Jagadish (Regional Medical Research Centre, NE Region (Indian Council of Medical Research)) ;
  • Narain, Kanwar (Regional Medical Research Centre, NE Region (Indian Council of Medical Research))
  • Published : 2014.11.06

Abstract

Background: The incidence of stomach cancer in India is highest in the state of Mizoram. In this population based matched case-control study, we evaluated the relationship between CYP450 2E1 RsaI polymorphism and risk of stomach cancer taking into considering various important dietary habits along with tobacco, alcohol consumption and H. pylori infection status. Materials and Methods: A total of 105 histologically confirmed stomach cancer cases and 210 matched healthy population controls were recruited. CYP2E1 RsaI genotypes were determined by PCR-RFLP and H. pylori infection status by ELISA. Information on various dietary, tobacco and alcohol habits was recorded in a standard questionnaire. Results: Our study revealed no significant association between the CYP2E1 RsaI polymorphism and overall risk of stomach cancer in Mizoram. However, we observed a non-significant protective effect of the variant allele (A) of CYP2E1 against stomach cancer. Tobacco smokers carrying C/C genotype have three times more risk of stomach cancer, as compared to non-smokers carrying C/C genotype. Both Meiziol and cigarette current and past smokers who smoked for more than 10 times per day and carrying the (C/C) genotype are more prone to develop stomach cancer. Smoke dried fish and preserved meat (smoked/sun dried) consumers carrying C/C genotype possesses higher risk of stomach cancer. No significant association between H. pylori infection and CYP2E1 RsaI polymorphism in terms of stomach cancer was observed. Conclusions: Although no direct association between the CYP2E1 RsaI polymorphism and stomach cancer was observed, relations with different tobacco and dietary risk habits in terms of developing stomach cancer exist in this high risk population of north-eastern part of India. Further in-depth study recruiting larger population is required to shed more light on this important problem.

Keywords

Stomach cancer;CYP 450 2E1 RsaI polymorphism;risk habits;Mizoram;India

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