Objective To study the c urative effect of the combined use of chemotherapy and radiotherapy on non smal l cell lung cancer at advanced stage.Methods Fifty two patient s have been chosen and divided into two groups:the radiotherapy group and the co mbined group.The radiotherapy group employed routine concomitant radiotherapy,th e dosage was 60~68GY/6~7 weeks.The combined group was treated with radiotherap y,and chemotherapy(EP regimen),and the chemotherapy was given before,during or a fter radiotherapy....