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Overall survival of (A) 716 patients with metachronous second primary lung cancer (MSPLC) after 2004 in different treatment groups before propensity score matching (PSM); (B) patients who received radiotherapy or no treatment, after PSM; (C) patients who received radiotherapy or underwent wedge resection, after PSM; (D) patients who received radiotherapy or underwent lobectomy, after PSM.
