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Evaluation of Risk Factors for Nasopharyngeal Carcinoma in a High-risk Area of India, the Northeastern Region

  • Lourembam, Deepak Singh (Department of Biotechnology, Manipur University) ;
  • Singh, Asem Robinson (Department of Biotechnology, Manipur University) ;
  • Sharma, T. Dhaneshor (Department of Radiotherapy, Regional Institute of Medical Sciences) ;
  • Singh, Th Sudheeranjan (Department of Otorhinolaryngology, Regional Institute of Medical Sciences) ;
  • Singh, Thiyam Ramsing (Department of Biotechnology, Manipur University) ;
  • Singh, Lisam Shanjukumar (Department of Biotechnology, Manipur University)
  • Published : 2015.07.13

Abstract

Northeastern India is a major nasopharyngeal carcinoma (NPC) high risk-area although the rest of the country has very low incidence. A case-control study of 105 NPC cases and 115 controls was conducted to identify the potential risk factors for NPC development in this region. Information was collected by interviewer about socio-demographic characteristics, cigarette smoking, alcohol consumption, dietary history, occupational history, and a family history of cancer. Epstein-Barr viral load was assayed from the blood DNA by real time PCR. Associations between GSTs genotypes, cytochrome P450 family including CYP1A1, CYP2E1 and CYP2A6 polymorphisms and susceptibility to relationship between the diseases were studied using PCR-RFLP assay. Results indicate that Epstein-Barr virus load was significantly higher in patients compared to controls (p<0.0001). Furthermore, concentration of blood EBV-DNA was significantly higher in advanced stage disease (Stage III and IV) than in early stage disease (Stage I and II) (p<0.05). Presence of CYP2A6 variants that reduced the enzyme activity was significantly less frequent in cases than controls. Smoked meat consumption, exposure to smoke, living in poorly ventilated house and alcohol consumption were associated with NPC development among the population of Northeastern India. Thus, overall our study revealed that EBV viral load and genetic polymorphism of CYP2A6 along with living practices which include smoked meat consumption, exposure to smoke, living in poorly ventilated houses and alcohol consumption are the potential risk factors of NPC in north eastern region of India. Understanding of the risk factors and their role in the etiology of NPC are helpful forpreventive measures and screening.

Keywords

Nasopharyngeal carcinoma;epstein-barr virus;viral load;genetic polymorphism;risk factor

Acknowledgement

Supported by : Department of Biotechnology (DBT), Ministry of Science and Technology

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