This paper describes the mechanisms of action of ionizing radiations c
ombined with antineoplastic drugs. Some relevant drugs for the combine
d modality treatments of locally advanced lung cancer are reported, Th
e meta-analyses including randomized trials comparing single agent (ra
diotherapy or chemotherapy) versus combined chemoterapy and radiothera
py in patients with unresectable non small cell lung cancer and limite
d small cell lung cancer are then reviewed. The clinical outcome in re
lation to different schedules of chemoradiotherapy (sequential, altern
ating and concurrent) is also focussed.