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Receiver operating characteristic (ROC) curves of proGRP, NSE, and their combination on the diagnosis of SCLC. A, SCLC vs NSCLC; B, SCLC vs BLD. ROC, receiver operating curve; proGRP, progastrin releasing peptide; NSE, neuron‐specific enolase; SCLC, small‐cell lung cancer; NSCLC, non‐small‐cell lung cancer; BLD, benign lung diseases; AUC, area under curve
