Figure 2From: Additional diagnostic value of tumor markers in cytological fluid for diagnosis of non-small-cell lung cancer Receiver operating characteristics (ROC) curves. (a) ROC curves for NAB combined with CYFRA 21–1, CEA and SCC in the serum and NAB alone. (b) ROC curves for NAB combined with CYFRA 21–1, CEA and SCC in the cytological fluid and NAB alone.Back to article page