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ROC curve for serum CEA, OPN and DKK1 expression in the diagnosis of NSCLC. (A) ROC curve of serum CEA and OPN expression in diagnosis of NSCLC; (B) ROC curve of serum CEA and DKK1 expression in diagnosis of NSCLC. CEA, carcinoma embryonic antigen; OPN, osteopontin; DKK1, Dickkopf-1; NSCLC, non-small cell lung cancer.
