Increased Risk of Developing Hepatocellular Carcinoma Associated with Carriage of the TNF2 Allele of the -308 Tumor Necrosis Factor-alpha Promoter Gene.

摘要

Background and Aims : Tumor necrosis factor-alpha (TNF-alpha) is a cytokine that may act as an endogenous tumor promoter. A genetic polymorphism of TNF-alpha at position -308 of the promoter region, which includes TNF1 (-308G) and TNF2 (-308A) alleles, has been found to be associated with susceptibility to various types of cancer. We conducted a study to evaluate the association between this polymorphism and hepatocellular carcinoma (HCC). Methods : We recruited 74 HCC patients and 289 healthy controls, and determined their -308 TNF-alpha promoter genotypes through polymerase chain reaction followed by electrophoresis. Results : Carriage of the TNF2 allele was associated with an increased risk of HCC (odds ratio [OR] = 3.5; 95% confidence interval [CI]:[2.1, 6.0]), and a trend toward a significant increase in the risk of developing HCC was observed from TNF1/TNF1, TNF1/TNF2, to TNF2/TNF2 genotypes ( p < 0.01). After adjustment for gender, age, and markers of hepatitis B and C, the OR of developing HCC associated with TNF2 allele carriage was 5.3 (95% CI: [2.3, 12.1]; p < 0.01) Conclusions : Carriage of the TNF2 allele is a significant predictor of HCC independent of hepatitis B and C, and therefore it may be used as a biomarker for susceptibility to HCC.