The receiver operating characteristic (ROC) curves suggested that CALML4 (area under the curve (AUC): 0.769, 95% confidence interval (CI): 0.638–0.881), COQ10B (AUC: 0.742, 95% CI: 0.587–0.881), PPP2R1A (AUC: 0.733 95% CI: 0.593–0.857), and CALML4 (AUC: 0.745, 95% CI: 0.571–0.900) were potential biomarkers for predicting the prognosis of pelvic inflammatory disease (Figures 5(c)–5(f)). Here, CALML4 is linked to pelvic inflammatory disease.