Histologically or cytologically confirmed newly diagnosed, untreated, unresectable stage IIIA or stage IIIB non-small cell lung cancer Not scheduled for curative cancer surgery No pleural effusion At least 1 bidimensionally or unidimensionally measurable lesion Age 18 years et 70 years; Performance Status < 2 Loss of weight < 10 % in past 6 months life expectancy 12 weeks; Bilirubin normal ASAT (SGOT) et ALAT (SGPT) 1,5 times upper limit of normal; Alcalin phosphatases 5 times upper limit of normal; Créatinin 1,5 x times upper limit of normal; Absolute neutrophil count greater than 2.109/l; Platelet count greater than 100.109/l; Hémoglobin ³ 10 g/ dl; Respiratory function : FEV1>50% write Consent