Abstract
The X-ray repair cross-complementation group 1 (XRCC1) protein plays an important role in base excision repair. In the present study, we specifically investigated whether common genetic variant in XRCC1 (exon 10, codon Arg399Gln) was associated with an altered risk of breast cancer. The eligible cases were patients at chemotherapy unit of Nemazi hospital, Shiraz Iran, from October 1999 to August 2000 and from July 2004 to July 2005. The present study included 186 females with breast cancer. Age frequency-matched controls were randomly selected from the healthy females blood donor, according to the age distribution of the cases. A total of 187 healthy females included in the study. Using PCR-based method, the XRCC1 Arg399Gln polymorphism was determined. In control group the 399Gln allele frequency was 32.6%. The genotypic frequencies of the control subjects did not show significant deviation from Hardy-Weinberg equilibrium (χ2 = 1.683, df = 1, P > 0.05). A statistically significant association was observed in comparison between Gln/Gln and Arg/Arg genotype (OR = 2.01, 95% CI:1.02–3.94, P = 0.041). There was no linear trend for presence of 0, 1, and 2 of the 399Gln allele and risk of breast cancer (χ2 = 1.212, P = 0.271). In the recessive effect of the Gln allele (comparison between Gln/Gln vs. Arg/Arg+Arg/Gln), Gln/Gln genotype significantly increased the risk of breast cancer (OR = 2.31, 95% CI:1.21–4.35, P = 0.010). In the dominant effect of the Gln allele (comparison between Gln/Gln+Arg/Gln vs. Arg/Arg), Gln/Gln+Arg/Gln genotypes was not associated with the risk of breast cancer (OR = 0.95, 95% CI:0.63–1.42, P = 0.799). It is concluded that 399Gln allele may act as a recessive allele and increase the breast cancer risk.
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The authors are indebted to the participants for their close cooperation. The authors are indebted to Dr. Maryam Ansari-Lari and Dr. Hassan Mohabtkar for critical reading of the manuscript and for their contribution in discussion.
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This study was supported by Shiraz University.
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Saadat, M., Kohan, L. & Omidvari, S. Genetic polymorphisms of XRCC1 (codon 399) and susceptibility to breast cancer in Iranian women, a case–control study. Breast Cancer Res Treat 111, 549–553 (2008). https://doi.org/10.1007/s10549-007-9811-5
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DOI: https://doi.org/10.1007/s10549-007-9811-5