CXCR4 and polycystic ovary syndrome: In conclusion, the changes in the expression of lncRNAs (IDH1-AS1, PCAT14, FTX, DANCR, PRKCQ-AS1, SNHG8, TPT1-AS1)and mRNAs (CXCR4, RABL6, OPN3, SYBU, IDH1, NOP10) may possibly affect endometrial function in patients with PCOS before the implantation window, probably resulting in implantation failure of the embryo.