Abstract
Cytochrome P450 (CYP) 1A1 Ile462Val (exon7) polymorphism has been suggested to be a risk factor for several cancers. Published data on its association with oral cancer risk have generated conflicting results. Our previous meta-analysis containing data from prior to Jan 2008 regarding this issue failed to find a significant association between CYP1A1 Ile462Val variation and oral cancer susceptibility. An updated meta-analysis with eligible studies for the period up to May 2012 was conducted. Separate analyses on ethnicity and source of controls were also performed. A total of 13 case–control studies comprising 1,515 cases and 2,233 controls were lastly selected for analysis. Compared with the previous meta-analysis, the overall data also failed to indicate a significant association of CYP1A1 Ile462Val polymorphism with oral cancer risk (Val/Val vs. Ile/Ile—OR = 1.46; 95 % CI = 0.96–2.24; dominant model—OR = 1.01; 95 % CI = 0.81–1.25; and recessive model—OR = 1.46; 95 % CI = 0.96–2.23). However, in the subgroup analysis by ethnicity, increased cancer risk was observed among Asians under the additive and recessive models (Val/Val vs. Ile/Ile—OR = 1.74; 95 % CI = 1.04–2.90 and recessive model—OR = 1.73; 95 % CI = 1.04–2.87), inconsistent with the previous meta-analysis. Collectively, the data of the present study suggest that CYP1A1 variant Val/Val alleles might modify the susceptibility to oral cancer among Asians. Further well-designed investigations with large sample sizes are required to confirm this conclusion.
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This work was supported by Initial Fund for Doctors of Guiyang Medical College (2009-14) and China Postdoctoral Science Foundation (20100471772).
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Zhuo, X., Zhao, H., Chang, A. et al. Cytochrome P450 1A1 Ile462Val polymorphism and oral carcinoma risk: an updated meta-analysis including 1,515 cases and 2,233 controls. Tumor Biol. 33, 2079–2089 (2012). https://doi.org/10.1007/s13277-012-0467-3
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DOI: https://doi.org/10.1007/s13277-012-0467-3