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ProGRP and NSE level in SCLC, NSCLC and BLD. A, proGRP level in SCLC, NSCLC and BLD; B, NSE level in SCLC, NSCLC and BLD; C, proGRP level in limited and extensive stages SCLC. proGRP, progastrin releasing peptide; SCLC, small‐cell lung cancer; NSCLC, non‐small‐cell lung cancer; BLD, benign lung diseases. **P < 0.01, ***P < 0.001
