[A 1:1 matched case-control study on the interaction between HBV, HCV infection and DNA repair gene XPC Ala499Val, Lys939Gln for primary hepatocellular carcinoma].
OBJECTIVE
To evaluate the interaction between environmental factors, HBV/HCV infections and DNA repair gene XPC exon 8 Ala499Val, exon 15 Lys939Gln on related risks to primary hepatocellular carcinoma (PHC).


METHODS
A 1:1 matched case-control study was conducted in Shunde city, Guangdong province. The genotypes of Ala499Val and Lys939Gln were detected by polymerase chain reaction restrictive fragment length polymorphism (PCR-RFLP) analysis, and gene-environment interactions were analyzed by conditional logistic regression.


RESULTS
Among people infected by HBV with non- or at least one mutant gene of Ala499Val carriers, the risk of PHC significantly increased, with ORs as 3.768 (95%CI: 1.137 - 12.485) and 3.667(95%CI: 1.122 - 11.981) respectively. With non- or at least one mutant gene of Lys939Gln, the risk was increasing with ORs as 6.778 (95%CI: 2.025 - 22.688) and 3.152 (95%CI: 1.062 - 9.351) respectively. In those with HCV infection, non- or at least one mutant gene of Ala499Val might increase the risk with ORs as 2.955 (95%CI: 0.587 - 14.869), 1.085(95%CI: 0.307 - 3.839) respectively. However, when compared to the ones with no mutant gene of Lys939Gln among the same research subjects, those carrying at least one gene may decrease the risk, with OR lowered from 4.197 (95%CI: 0.870 - 20.243) to 0.887 (95%CI: 0.228 - 3.448). But the interactions between HBV infection, HCV infection and XPC genes were not statistically significant.


CONCLUSIONS
Among people infected by HCV, the mutant gene of Ala499Val had the tendency to lower the risk of PHC, and the mutant gene of Lys939Gln also appeared the same in the population with either HBV infection or HCV infection in Shunde, Guangdong. Another study with large samples should be performed to analyze the interactions among environments-genes.
Cai
Xu-ling
XL
Public Health College, Guangdong College of Pharmacy, Guangzhou 510310, China.
Gao
Yan-hui
YH
Yu
Zhuo-wen
ZW
Wu
Zhao-quan
ZQ
Zhou
Wei-ping
WP
Yang
Yi
Y
Xu
Ya
Y
Song
Shao-fang
SF
Chen
Si-dong
SD
D006528:Carcinoma, Hepatocellular / Q000209:etiology* / Q000235:genetics; D016022:Case-Control Studies; D002681:China; D004260:DNA Repair / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D005091:Exons; D020022:Genetic Predisposition to Disease; D006509:Hepatitis B / Q000150:complications*; D006526:Hepatitis C / Q000150:complications*; D006801:Humans; D008113:Liver Neoplasms / Q000209:etiology* / Q000235:genetics; D016015:Logistic Models; D009154:Mutation; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length
D004268:DNA-Binding Proteins; C086984:XPC protein, human