Many studies proposed that cytochrome P450 1A1 (CYP1A1) MspI polymorphism may be associated with endometrial cancer risk, but the findings from previous studies reported conflicting results. A meta-analysis of all relevant studies was performed to get a comprehensive assessment of the association between CYP1A1 MspI polymorphism and endometrial cancer risk. Eligible studies were searched in PubMed and China National Knowledge Infrastructure databases. The pooled odds ratios (ORs) with the corresponding 95 % confidence intervals (95 % CIs) were calculated to evaluate the association. Twelve studies with a total of 2,111 cases and 2,894 controls were finally included into the meta-analysis. Overall, meta-analysis of a total of 12 studies showed that there was no obvious association between CYP1A1 MspI polymorphism and endometrial cancer risk (ORC vs. T = 0.97, 95 % CI 0.77-1.22, P OR = 0.808; ORCC vs. TT = 1.00, 95 % CI 0.57-1.76, P OR = 0.994; ORCC vs. TT/TC = 0.88, 95 % CI 0.65-1.20, P OR = 0.425; ORCC/TC vs. TT = 0.98, 95 % CI 0.74-1.29, P OR = 0.861). Subgroup analyses by ethnicity further showed that there was no obvious association between CYP1A1 MspI polymorphism and endometrial cancer risk in both Caucasians and Asians. There was no obvious risk of publication bias. Therefore, the meta-analysis suggests that CYP1A1 MspI polymorphism is not associated with endometrial cancer risk.
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