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Overall survival with regard to histology. Red line, squamous cell carcinoma (Sq); black line, non‐Sq non–small cell lung cancer (NSCLC) with epidermal growth factor receptor (EGFR) mutation; dark green line, non‐Sq NSCLC without EGFR mutation; dark orange line, non‐Sq NSCLC of unknown EGFR status; blue line, small cell lung cancer
