Fig. 2

Receiver operating characteristic (ROC) curves of c-CYFRA level and FDG uptake (SUVmax) in predicting EGFR mutations. a ROC of c-CYFRA showed that a cut-off of 20.8 ng/ml had the highest sensitivity of 83.3 % (area under the ROC curve = 0.715, p = 0.001) in discriminating EGFR mutations from wild-type EGFR. b ROC of FDG uptake showed that a SUVmax cut-off of 9.6 had the highest sensitivity of 79.3 % in predicting EGFR mutations (area under the ROC curve = 0.68, p = 0.010)