Fig. 1. Receiver operating characteristic (ROC) curve to determine the optimal cutoff value of serum squamous cell carcinoma antigen (SCC-Ag) for diagnosis of recurrent cervical squamous cell carcinoma. The area under the ROC curve was 0.914 (95% confidence interval, 0.887–0.942; P<0.001). (A) SCC-Ag≥1 ng/mL, Sensitivity=92.5%, Specificity=50.3%. (B) SCC-Ag≥1.5 ng/mL, Sensitivity=86.3%, Specificity=85.0%. (C) SCC-Ag≥2.0 ng/mL, Sensitivity=80.2%, Specificity=94.6%. (D) SCC-Ag≥2.5 ng/mL, Sensitivity=73.1%, Specificity=97.7%. (E) SCC-Ag≥3.0 ng/mL, Sensitivity=67.8%, Specificity=98.9%.
