Serpins serine proteinase inhibitor 6 Humans 5 human 5 Article 4 controlled study 4 metabolism 4 Biomarkers 3 China 3 Female 3 Male 3 Prognosis 3 biological marker 3 enzyme linked immunosorbent assay 3 female 3 major clinical study 3 male 3 prognosis 3 Adolescent 2 Adult 2 Antigens, Neoplasm 2 Biomarkers, Tumor 2 CEACAM5 protein, human 2 Carcinoembryonic Antigen 2 Case-Control Studies 2 GPI-Linked Proteins 2 Keratin-19 2 Lung Neoplasms 2 Middle Aged 2 Peptide Fragments 2