In contrast, expression of MMP9 (0.21 ± 0.03) and VEGF (0.10 ± 0.02) decreased significantly (P < 0.05) in AUB females with miscarriage compared to AUB females with no (0.39 ± 0.06, 0.19 ± 0.01) miscarriage history. The gene discussed is MMP9; the disease is spontaneous abortion.