Furthermore, there was a negative correlation between serum miR-23a level and LH concentration in PCOS patients (Fig. 1d, P = 0.0088, r = 0.3665), but no correlation was found in healthy control group (Fig. 1e, P = 0.3210, r = 0.1432). The gene discussed is PLOD1; the disease is polycystic ovary syndrome.