Association between genetic polymorphism in DNA repair genes and risk of B-cell lymphoma.

OBJECTIVES: The authors evaluated the possible effect of DNA repair genes, XPD (Xeroderma pigmentosum group D) codon (312 and 751) and XRCC1 (X-ray repair cross-complementing group 1) codon (194 and 399) SNPs (single-nucleotide polymorphisms) on the risk of childhood B-cell lymphoma. METHODS: The polymorphisms were analyzed in 33 patients with BL cases and in 52 healthy, age-matched controls using PCR-RFLP method. RESULTS: The authors observed no association between variation in the XPD codon Asp312Asn, Lys751Gln, and XRCC1 codon Arg399Gln polymorphisms and B-cell lymphoma for any parameter. In contrast, tryptophan allele frequency in control and patient groups was 0.10 and 0.03 respectively (p = .04). The frequency of XRCC1 194Arg/Trp genotype in B-cell lymphoma was significantly lower than that in controls (p = .005). No significant relationship was found between genotypes and stage, lactate dehydrogenase, or bone marrow involvement. CONCLUSIONS: XRCC1 194Trp allele may be associated with a protective effect against development of childhood B-cell lymphoma. However, these results were based on a small number of case and further studies should be done.