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http://dx.doi.org/10.7314/APJCP.2014.15.1.299

Association of NRF2 Polymorphism with Cholangiocarcinoma Prognosis in Thai Patients  

Khunluck, Tueanjai (Department of Pharmacology, Faculty of Medicine, Khon Kaen University)
Kukongviriyapan, Veerapol (Department of Pharmacology, Faculty of Medicine, Khon Kaen University)
Puapairoj, Anucha (Department of Pathology, Faculty of Medicine, Khon Kaen University)
Khuntikeo, Narong (Department of Surgery, Faculty of Medicine, Khon Kaen University)
Senggunprai, Laddawan (Department of Pharmacology, Faculty of Medicine, Khon Kaen University)
Zeekpudsa, Ponsilp (Department of Pharmacology, Faculty of Medicine, Khon Kaen University)
Prawan, Auemduan (Department of Pharmacology, Faculty of Medicine, Khon Kaen University)
Publication Information
Asian Pacific Journal of Cancer Prevention / v.15, no.1, 2014 , pp. 299-304 More about this Journal
Abstract
Cholangiocarcinoma (CCA), a malignancy of biliary duct with a very poor prognosis, is the leading cause of cancer death in countries of the Mekong subregion. Liver fluke infection is the main etiological factor, but genetic variation has been recognized as also important in conferring susceptibility to CCA risk. Nuclear factor (erythroid derived 2)-like 2 (NRF2) is a key transcription factor in detoxification and antioxidant defense. Emerging evidence has demonstrated that genetic polymorphisms in the NRF2 gene may be associated with cancer development. The objectives of this study were to investigate the association of NRF2 genetic polymorphism with CCA risk and to evaluate the influence of the NRF2 genotype on survival time of affected patients. Single nucleotide polymorphisms (SNPs) of the NRF2 gene, including rs6726395: A/G, rs2886161: C/T, rs1806649: C/T, and rs10183914: C/T, were analyzed using TaqMan$^{(R)}$ SNP genotyping assays. Among 158 healthy northeastern Thai subjects, the allele frequencies were 41, 62, 94, and 92%, respectively. The correlation of NRF2 SNPs and CCA risk was analyzed in the 158 healthy subjects and 198 CCA patients, using unconditional logistic regression. The results showed that whereas the NRF2 SNPs were not associated with CCA risk (p>0.05), Kaplan-Meier analysis of 88 intrahepatic CCA patients showed median survival time with rs6726395 genotypes of GG and AA/AG to be $344{\pm}138$ (95%CI: 73-615) days and $172{\pm}37$ (95%CI: 100-244) days, respectively, (p<0.006). On multivariate Cox proportional hazard analysis, the GG genotype of rs6726395 was found to be associated with longer survival with a hazard ratio of 0.54 (95%CI: 0.31-0.94). In addition, non-papillary adenocarcinoma was associated with poor survival with a hazard ratio of 2.09 (95%CI: 1.16-3.75). The results suggest that the NRF2 rs6726395 polymorphism can be a potential prognostic biomarker for CCA patients.
Keywords
NRF2; polymorphism; cholangiocarcinoma; Thai population; prognosis;
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