title: RAD51 135G>C does not modify breast cancer risk in non-BRCA1/2 mutation carriers: evidence from a meta-analysis of 12 studies.
abstract: A single-nucleotide polymorphism (SNP) in the 5'-untranslated region (UTR) of RAD51, 135G>C (rs1801320), was reported to be associated with an increased risk of breast cancer among BRCA2 as well as BRCA1 carriers. A few studies have also investigated the genetic contribution of RAD51 135G>C to the risk of sporadic breast cancers or breast cancer in non-BRCA1/2 carriers, though the results are yet controversial and inconclusive. We, in this study, performed a more precise estimation of the relationship between 135G>C and breast cancer among non-BRCA1/2 mutation carriers by meta-analyzing the currently available evidence from the literature. A total of 12 studies involving 7,065 cases and 6,981 controls were identified. Crude odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of association. When all the studies were pooled into the meta-analysis, there was no evidence for a significant association between 135G>C and breast cancer risk in non-BRCA1/2 mutation carriers (for CC vs. GG: OR = 0.995, 95%CI: 0.741-1.336; for GC vs. GG: OR = 0.959, 95%CI: 0.869-1.057; for dominant model: OR = 0.988, 95%CI: 0.902-1.082; and for recessive model: OR = 1.037, 95%CI: 0.782-1.376). We also performed subgroup analysis by ethnicity (Caucasian) as well as did analysis using the studies fulfilling Hardy-Weinberg equilibrium, and the results did not change. In summary, the present meta-analysis suggests that the RAD51 135G>C does not modify breast cancer risk in non-BRCA1/2 mutation carriers.
authors.affiliation: Department of Breast Surgery, Cancer Center/Cancer Institute, Fudan University, 399 Ling-Ling Road, Shanghai, 200032, People's Republic of China.
authors.forename: Ke-Da
authors.initials: KD
authors.lastname: Yu
authors.forename: Chen
authors.initials: C
authors.lastname: Yang
authors.forename: Lei
authors.initials: L
authors.lastname: Fan
authors.forename: Ao-Xiang
authors.initials: AX
authors.lastname: Chen
authors.forename: Zhi-Ming
authors.initials: ZM
authors.lastname: Shao
mesh_terms: D020121:5' Untranslated Regions; D001943:Breast Neoplasms / Q000208:ethnology / Q000235:genetics*; D016001:Confidence Intervals; D005260:Female; D019398:Genes, BRCA1; D024522:Genes, BRCA2; D056726:Genetic Association Studies; D005838:Genotype; D006579:Heterozygote; D006801:Humans; D020641:Polymorphism, Single Nucleotide; D051135:Rad51 Recombinase / Q000235:genetics*; D044465:White People
chemical_list: D020121:5' Untranslated Regions; C495153:RAD51 protein, human; D051135:Rad51 Recombinase