The PCOS group showed more patients with CC+CT genotypes rs12644822, rs3756159 and rs13138607 than the control group, and CC+CT genotypes and C alleles from three positions enhanced risk of PCOS.
In conclusion, these findings demonstrate that CC+CT genotypes rs12644822C>T, rs3756159C>T and rs13138607C>T in the GnRHR gene may contribute to a decreased pregnancy rate for PCOS patients after IVF-ET.