PHGDH and spontaneous abortion: Table 4 presents the main reproductive outcomes of the two groups. No significant difference was observed in clinical pregnancy rate (55.81% vs. 65.11%), implantation rate (47.89% vs. 50.70%), ectopic pregnancy rate (4.17% vs. 0%), miscarriage rate (8.33% vs. 14.29%), live birth rate (48.84% vs. 55.81%), gestational week at birth (37.9 ± 1.7 vs. 37.8 ± 1.8), or birth weight (2.9 ± 0.6 vs. 2.8 ± 0.6) between the SERa+ oocyte group and the matched group.