OBJECTIVETo evaluate the effects of radiotherapy in the treatment of small-cell lung cancer and the optimal radiation doses, irradiation volume and fractionations.

METHODSUsing evidence-based principles to search and evaluate clinical evidence on radiotherapy of small-cell lung cancer and giving grades of recommendation in clinical practice.

RESULTS AND CONCLUSIONThe combination of chemotherapy and thoracic irradiation were the treatment strategy in limited stage small-cell lung cancer (LD SCLC). There were no clear answers on optimal irradiation dose and volume. Early thoracic irradiations were better than later ones. Radiotherapy should be started at the first or second cycle of chemotherapy. Hyperfractionated irradiation may have therapeutic benefit compared with conventional irradiation. Prophylactic cranial irradiation could improve survival for patients with complete response after chemotherapy and radiotherapy.