Objective:To study apoptosis induction effect of low dose and high dose X-ray irradiation on esophageal cancer cell line EC9706 transfected with pEgr-P16 plasmid.Methods:EC9706 cell line was transfected with pEgr-P16 plasmid packaged by lipsome,and steady expression cells were gotten by G418 selecting.P16 expression was detected by Western blot.EC9706 cells apoptosis was observed after different doses of X-ray irradiation.Results:pEgr-P16 plasmid was transfected into EC9706 cells and steady expression cells...