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The associations between DNA repair capacity (DRC), DNA repair gene polymorphisms, and the incidence of hepatocellular carcinoma (HCC) have not been determined in high-risk areas. The aims of this study were to investigate whether DRC is related to the incidence of HCC and to determine whether polymorphisms in the DNA repair genes that regulate DRC are associated with the risk of HCC. First, a small case-control study was conducted to examine the association between DRC and the incidence of HCC and the environmental and genetic factors regulating DRC. Then, a large case-control study was conducted to determine whether those DNA repair gene polymorphisms shown to regulate DRC were related to the risk of HCC. The median DRC was significantly lower among the cases (0.80) than the controls (0.93). A multivariate linear regression analysis showed that the HBsAg status (p&lt;0.01), ethnicity (p=0.01), and polymorphisms in the XRCC3-241 (p=0.01) and APE1-148 (p=0.03) gene loci may be impact factors for DRC. In the large case-control study, a stratified analysis showed that individuals with the APE1-148-combined genotype GT+TT likely had a significantly higher HCC risk compared with those with only the GG genotype (crude odds ratio=1.93, 95% confidence interval=1.17-3.17) among the Zhuang ethnicity. However, nonsignificant differences were observed between XRCC3-241 polymorphisms and the HCC risk. DRC may be related to the incidence of HCC as determined by environmental and genetic factors found in southwestern part of the Guangxi Province. Gene-environment interactions play an important role in the incidence and progression of HCC.

DNA Repair Capacity, DNA-Strand Break Repair Gene Polymorphisms, and the Incidence of Hepatocellular Carcinoma in Southwestern Guangxi of China