CXCL12 and polycystic ovary syndrome: Although the levels of SDF-1α and MIP-1β in the FF of women with PCOS were independent of parameters such as BMI, age, LH and T (Supplementary Table 5), compared with PCOS patients with lower T levels, FF SDF-1α was significantly lower in PCOS women with slightly higher T (mean: 1135 ± 76.66 pg/ml vs. 899.3 ± 80.32, P < 0.05) (Table 2).