Objective:To explore the potentiation of silencing atxia-telangiectasia mutated(ATM) gene expression in the radiosensitization effect of cytosine-phophate-guanine oligodeoxynucleotide(CpG ODN) 7909 on non-small cell lung cancer A549 cell line.Methods: ATM-siRNA was transfected into A549 cells,and the expression of ATM protein in A549 cells was examined by Western blotting.A549 cells were randomly classified into six groups: control group,CpG group,X-ray(IR) group,CpG+IR group,ATM-siRNA+CpG+IR group and NC-s...