Objective To study the expression and clinical significance of anty-apoptosis protein BAG-1 in non-small cell lung cancer(NSCLC),and its relationship with cell apoptosis and expression of Bcl-2 protein. Methods Immunohisto chemistry streptavidin-peroxidase conjugated (SP)method was used to examine the expression of BAG-1protein and Bcl-2 protein,and terminal deoxynucleotidyl transferase mediated UTP nick end labeling(TUNEL) method was used to examine the apoptosis index in 54 cases of NSCLC.The expression of BAG-1 protein in 20 cases of normal bronchus mucosa tissue also be detected as control. Results Express positive rate of BAG-1 protein in NSCLC is 74.07%,obviously higher than that in normal bronchus mucosa tissue(positive rate is 5%).In cases of NSCLC,the expression of BAG-1 protein has not correlation with the age,gender,pathologic classification,but have closed correlation with lymph node metastasis,degree of differentiation,pTNM stage(P