Potential Positive Association between Cytochrome P450 1A1 Gene Polymorphisms and Recurrent Pregnancy Loss: a Meta‐Analysis

In order to discover the potential genetic risks associated with recurrent pregnancy loss (RPL), this meta‐analysis was conducted to assess the association between CYP1A1 gene polymorphism and RPL. Studies were retrieved from the databases PubMed, Embase, HuGENet, and CNKI. Four models were then applied. Seven studies, including three datasets for the rs1048943 and five for the rs4646903 single‐nucleotide polymorphism (SNP), were included in this analysis, involving 613 cases and 398 controls for the rs1048943; and 864 cases and 842 controls for the rs4646903 SNP. After comprehensive analysis, we found that rs4646903 was significantly associated with RPL recessive (OR = 1.72, 95%CI: 1.13–2.61); codominant (CC vs TT; OR = 1.74, 95%CI: 1.12–2.71), (CC vs CT; OR = 1.67, 95%CI: 1.07–2.62) and allele analysis (OR = 1.27, 95%CI: 1.07–1.50)]. In the following subgroup analysis, a positive association was also discovered among people of Asian descent, especially South Asians. However, there was no obvious association between rs1048943 and RPL. In summary, our results suggest that CYP1A1 gene polymorphism (particularly for rs4646903) might be associated with RPL risk, especially among South Asians. Further studies are required to confirm this association.