GNRH1 and polycystic ovary syndrome: <h4>Objective</h4>To evaluate the clinical efficacy of Xiaonang Yusi decoction (XNYSD, ) in patients with phlegm-dampness type polycystic ovary syndrome (PCOS) undergoing <i>in vitro</i> fertilization and embryo transfer (IVF-ET), and to investigate its underlying mechanism by examining the arachidonic acid (AA) metabolic pathway.<h4>Methods</h4>Women undergoing IVF-ET were divided into a treatment group (TCM treatment), a phlegm-dampness PCOS group, and a tubal factor control group (<i>n =</i> 32 each); all received a GnRH antagonist protocol.