Fig. 3

ROC curve analysis of serum Smad4 to distinguish NSCLC patients from healthy people. a, b Critical value (104 ng/L) of serum Smad4 for discerning NSCLC patients from healthy people had a sensitivity of 91.56% and specificity of 61.56%. c ROC of serum Smad4 for distinguishing NSCLC patients from healthy people (AUC = 0.720). NSCLC, non-small cell lung cancer; ROC, receiver operating characteristic curve; AUC, area under the curve