Second, the numbers of retrieved oocytes in both groups were high in our study.Finally, most women in our study were triggered with a short-acting GnRH agonist accompaniedwith small-dose hCG (2000 IU) in case of inadequate endogenous LH surge after GnRH agonistadministration, and the latter might have increased the risk of OHSS. This evidence concerns the gene PLOD1 and ovarian hyperstimulation syndrome.