title: Associations between XPD polymorphisms and risk of breast cancer: a meta-analysis.
abstract: Studies on polymorphisms of Xeroderma Pigmentosum Group D Protein (XPD) and breast cancer risk are inconclusive. To elucidate the role of XPD genotypes, all available studies were considered in this meta-analysis. The study provided 11,362/10,622 cases/controls for XPD K751Q and 9010/9873 cases/controls for XPD D312N, respectively. Overall, no apparent effects of 751Q allele compared to 751K on breast cancer risk was found in all subjects [RE OR = 1.04, 95% confidence interval (CI) (0.97-1.10), P = 0.28]. Insignificant effects were also found under other genetic contrasts (homologous contrast, dominant model, and recessive model). However, the 751Q allele showed significantly increased risk in Caucasians [FE OR = 1.05, 95% CI (1.00-1.11), P = 0.035]. In addition, insignificant risk effects of D312N polymorphism on breast cancer susceptibility were observed in all subjects under any genetic contrast, but protective effects of 312NN genotype were observed under recessive model [P = 0.02, OR = 0.53, 95% CI (0.32, 0.90)] and homozygote contrast [P = 0.03, OR = 0.55; 95% CI (0.32, 0.96)] in Asians. In summary, our meta-analysis suggested 312N allele might act as a recessive allele in its association with breast cancer and the 751Q allele may play a plausible role in breast cancer development whereas the ethnic background should be carefully concerned in further studies.
authors.affiliation: Department of Colorectal Surgery, Cancer Hospital, Fudan University, Shanghai 200032, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Jiang
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Li
authors.forename: Ye
authors.initials: Y
authors.lastname: Xu
authors.forename: Sanjun
authors.initials: S
authors.lastname: Cai
authors.forename: Xishan
authors.initials: X
authors.lastname: Wang
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D051759:Xeroderma Pigmentosum Group D Protein / Q000235:genetics*
chemical_list: D051759:Xeroderma Pigmentosum Group D Protein; C497292:ERCC2 protein, human