title: XPC polymorphisms play a role in tissue-specific carcinogenesis: a meta-analysis.
abstract: XPC participates in the initial recognition of DNA damage during the DNA nucleotide excision repair process in global genomic repair. Polymorphisms in XPC gene have been analyzed in case-control studies to assess the cancer risk attributed to these variants, but results are conflicting. To clarify the impact of XPC polymorphisms in cancer risk, we performed a meta-analysis that included 33 published case-control studies. Polymorphisms analyzed were Lys939Gln and Ala499Val. The overall summary odds ratio (OR) for the associations of the 939Gln/Gln genotype with risk of cancer was 1.01 (95% confidence interval (95% CI): 0.94-1.09), but there were statistically significant associations for lung cancer, observed for the recessive genetic model (Lys/Lys+Lys/Gln vs Gln/Gln), (OR 1.30; 95% CI: 1.113-1.53), whereas for breast cancer a reduced but nonsignificant risk was observed for the same model (OR 0.87; 95% CI: 0.74-1.01). The results for Ala499Val showed a significant overall increase in cancer risk (OR 1.15; 95% CI: 1.02-1.31), and for bladder cancer in both the simple genetic model (Ala/Ala vs Val/Val) (OR 1.30; 95% CI: 1.04-1.61) and the recessive genetic model (Ala/Ala+Ala/Val vs Val/Val) (OR 1.32; 95% CI: 1.06-1.63). Our meta-analysis supports that polymorphisms in XPC may represent low-penetrance susceptibility gene variants for breast, bladder, head and neck, and lung cancer. XPC is a good candidate for large-scale epidemiological case-control studies that may lead to improvement in the management of highly prevalent cancers.
authors.affiliation: Laboratório de Oncologia Experimental LIM-24, Departamento de Radiologia, Faculdade de Medicina da Universidade de São Paulo, Avenida Dr Arnaldo 455, São Paulo, SP, Brazil.
authors.forename: Guilherme
authors.initials: G
authors.lastname: Francisco
authors.forename: Paulo Rossi
authors.initials: PR
authors.lastname: Menezes
authors.forename: José
authors.initials: J
authors.lastname: Eluf-Neto
authors.forename: Roger
authors.initials: R
authors.lastname: Chammas
mesh_terms: D002471:Cell Transformation, Neoplastic / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D006801:Humans; D009369:Neoplasms / Q000235:genetics* / Q000473:pathology; D011110:Polymorphism, Genetic
chemical_list: D004268:DNA-Binding Proteins; C086984:XPC protein, human