Four Polymorphisms in the Cytochrome P450 1A2 (CYP1A2) Gene and Lung Cancer Risk: a Meta-analysis

Background: Previous published data on the association between CYP1A2 rs762551, rs2069514, rs2069526,and rs2470890 polymorphisms and lung cancer risk have not allowed a definite conclusion. The present metaanalysisof the literature was performed to derive a more precise estimation of the relationship. Materials and
Methods: 8 publications covering 23 studies were selected for this meta-analysis, including 1,665 cases and 2,383controls for CYP1A2 rs762551 (from 8 studies), 1,456 cases and 1,792 controls for CYP1A2 rs2069514 (from 7studies), 657 cases and 984 controls for CYP1A2 rs2069526 (from 5 studies) and 691 cases and 968 controls forCYP1A2 rs2470890 (from 3 studies).
Results: When all the eligible studies were pooled into the meta-analysisfor the CYP1A2 rs762551 polymorphism, significantly increased lung cancer risk was observed in the dominantmodel (OR=1.21, 95 % CI=1.00-1.46). In the subgroup analysis by ethnicity, significantly increased risk of lungcancer was observed in Caucasians (dominant model: OR=1.29, 95%CI=1.11-1.51; recessive model: OR=1.33,95%CI=1.01-1.75; additive model: OR=1.49, 95%CI=1.12-1.98). There was no evidence of significant associationbetween lung cancer risk and CYP1A2 rs2069514, s2470890, and rs2069526 polymorphisms.
Conclusions: Insummary, this meta-analysis indicates that the CYP1A2 rs762551 polymorphism is linked to an increased lungcancer risk in Caucasians. Moreover, our work also points out the importance of new studies for rs2069514associations in lung cancer, where at least some of the covariates responsible for heterogeneity could be controlled,to obtain a more conclusive understanding about the function of the rs2069514 polymorphism in lung cancerdevelopment.