Association of IL‐17 and IL‐27 polymorphisms with susceptibility to recurrent pregnancy loss and pre‐eclampsia: A systematic review and meta‐analysis

OBJECTIVE: Recurrent pregnancy loss (RPL) and pre‐eclampsia (PE) are immune‐related pregnancy complications that have been linked to CD4(+) T cells and their cytokines, which can be influenced by genetic polymorphisms. This meta‐analysis aimed to investigate the relationship between interleukin (IL)‐17 and ‐27 polymorphisms and the susceptibility to RPL and PE. METHODS: All eligible case‐control studies published up to February 2023 were identified by searching PubMed, EMBASE, Cochrane, Web of Science, and Google Scholar. The risk of recurrent pregnancy loss and PE associated with the IL‐17 rs2275913, IL‐17 rs763780, IL‐27 rs153109, and IL‐27 rs17855750 polymorphisms were estimated for each study. RESULTS: The meta‐analysis incorporated a total of 13 studies. The overall analysis indicated that IL‐17 rs2275913, IL‐17 rs763780, IL‐27 rs153109, and IL‐27 rs17855750 polymorphisms were not significantly associated with immune‐related pregnancy complications, including RPL and PE. However, when the analysis was stratified by disease type, the IL‐17 rs2275913 polymorphism was found to be associated with an increased risk of RPL (recessive model AA/GA + GG: OR = 1.68, 95% confidence interval [CI]: 1.13–2.49, p = .01). CONCLUSIONS: The IL‐17 rs763780, IL‐27 rs153109, and IL‐27 rs17855750 polymorphisms were not significantly associated with RPL and PE, whereas the IL‐17 rs2275913 polymorphism was associated with the susceptibility to recurrent miscarriage.