We also detected the expression levels of inflammatory cytokines IL-6, TNF-α, and IL-1β produced by CCR9-expressing immune cells in the FF of PCOS patients and observed the elevated levels of IL-6 and TNF-α in the HOR group, while no significant differences were detected in the IL-1β level between the two groups. This evidence concerns the gene CCR9 and polycystic ovary syndrome.