Association of nonsynonymous SNPs of nucleotide excision repair genes ERCC4 rs1800067 (G/A) and ERCC5 rs17655 (G/C) as predisposing risk factors for gallbladder cancer



      Deregulation of DNA repair mechanisms have been frequently demonstrated in the pathology of cancers including gallbladder cancer.


      We aimed to investigate the association of ERCC4 rs1800067 (G/A) and ERCC5 rs17655 (G/C) with the predisposition in gallbladder cancer and its prognosis. We have also investigated the prognostic and diagnostic values of expression profiles of ERCC4 and ERCC5 in GBC.


      Polymorphisms of rs1800067 and rs17655 were genotyped by PCR-RFLP. The expression of these genes was analyzed by semi-quantitative PCR. Overall survival was analyzed using Kaplan-Meier plot and cox-regression analysis.


      Patients with risk group genotypes of rs17655 have shorter overall survival in patients with presence of gallstone, T1+T2 tumor invasion, absence of lymph node involvement and early stages of tumor. Homozygous wild genotype (GG) of rs1800067 and homozygous mutant genotype (CC) of rs17655 together increases two-fold risk of the disease. The variant genotypes (GC/CC) of rs17655 show significantly higher level of ERCC5 expression.


      Major allele of ERCC4 rs1800067 and minor allele of ERCC5 rs17655 are significantly associated with increased risk of GBC. Upregulation of ERCC4 and ERCC5 is an early event of development of GBC.


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