Department of General Surgery Inner Mongolia People''s Hospital Hohhot 010017 China;
Department of Oncology Inner Mongolia People''s Hospital Hohhot 010017 China;
Department of Surgical Oncology Inner Mongolia People''s Hospital Hohhot 010017 China;
Department of Surgical Oncology Inner Mongolia People''s Hospital Hohhot 010017 China;
Department of Surgical Oncology Inner Mongolia People''s Hospital Hohhot 010017 China;
Department of Surgical Oncology Inner Mongolia People''s Hospital Hohhot 010017 China;
lung cancer; histological subtypes; prognosis; the echinoderm microtubule-associated protein-like 4 gene-ALK variant(EML4-ALK); epidermal growth factor receptor(EGFR);