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Study profile. *, non-primary lung cancers: (I) metastasis from other tumors; (II) double primary tumor; (III) unknown. NSCLC, non-small cell lung cancer; SCLC, small cell lung cancer; LCNEC, large cell neuro-endocrine carcinoma; AC, atypical carcinoid; TC, typical carcinoid; BLD, benign lung disease.
