Correlation analysis further showed that SDF-1α levels in the FF of PCOS patients with a normal BMI tended to be negatively correlated with FSH levels, but the correlation was not significant (r = −0.67, P = 0.005 (Fig. 4A); FDR = 0.070 (Supplementary Table 6)). Here, CXCL12 is linked to polycystic ovary syndrome.