The above results suggested that cytokines in the serum of PID patients were altered, and we further found that TNF-α levels were significantly positively correlated with mPLI (r=0.556), mSBI (r=0.588), PD (r=0.748) (P<0.001), and with IL-6 (r=0.336, P<0.001). The gene discussed is TNF; the disease is pelvic inflammatory disease.