To clarify this hypothesis, we collected GCs from PCOS patients and normal patients to detect FABP5 expression and found that FABP5 mRNA and protein were expressed at high levels in the GCs of PCOS patients compared with those of normal patients (Fig. 2A, B) (A: Normal vs. PCOS = 1.044 ± 0.308 vs. 1.567 ± 0.341, P < 0.01). Here, FABP5 is linked to polycystic ovary syndrome.