Fig. 2

The diagnostic power of FST for lung cancer (n = 91) against the healthy subject (n = 37) and patients with benign lung disease (n = 22). a Power of FST in differentiating LC patients from BLD. Optimal cutoff value, where the sum of sensitivity and specificity was maximum, were 1509.55 pg/mL. b Power of FST in differentiating LC patients from HSs. The optimal cutoff values were 970.74 pg/mL. ROC, receiver operating characteristic; AUC, area under the curve