Aim: Genetic polymorphism in XRCC1 and XRCC3 genes may influence DNA repair capacity and, in turn, confer predisposition to breast cancer.
Material and methods: In the present work the distribution of genotypes and frequency of alleles of the Arg194Trp and Arg399Gln polymorphism of XRCC1 and Trp241 Met polymorphism in XRCC3 in breast cancer women were analysed. Blood samples were obtained from 150 women with breast cancer and controls (n = 106). The polymorphisms were determined by PCR-RFLP methods.
Results: No association between XRCC1 Arg399Gln and Arg194Trp genotype and breast cancer risk was observed. The distribution of the genotypes of the Trp241 Met polymorphism of XRCC3 in both controls and patients did not differ significantly (p > 0.05) from those predicted by the Hardy-Weinberg distribution. There were no significant differences (p > 0.05) in genotype distributions and allele frequencies between subgroups assigned to histological stage.
Conclusion: The results suggest that the Arg194Trp and Arg399Gln polymorphism of the XRCC1 gene as well as Trp241 Met polymorphism in XRCC3 may not be linked with appearance and development of breast cancer.