Objective To investigate the clinical value of serum levels of HE4,CYFRA21-1 and TPS in early diagnosis of patients with NSCLC. Methods 97 patients with primary NSCLC from December 2015 to December 2016 were selected as the NSCLC group,92 patients with benign lung lesions or pneumonia treated as the benign control group,and 90 physical examination cases as the healthy control group. The expression levels of HE4,CYFRA21-1 and TPS in serum were detected by electrochemiluminescence assay and ELISA,respectively...