Radiotherapy represents one of the primary treatment modalities for patients with limited stage small cell lung cancer (SCLC). With contemporary concurrent radiotherapy and chemotherapy, approximately 20% of patients survive 5 years. While distant metastases are common, local (intrathoracic) failures are common as well, occurring in 40% of treated patients. Reducing local failure rates may lead to improved survival for these patients. There appears a growing body of data, which suggests a radiation dose response relationship for SCLC. However, the close proximity of critical normal structures, such as the spinal cord and esophagus, to the primary tumour limits the prescription dose in conventional radiotherapy. Three Dimensional Conformal Radiotherapy (3DCRT) offers the possibility of reducing normal tissue irradiation and hence reducing the treatment toxicity while maintaining the dose of radiation to the tumour. Another strategy is accelerated fractionation, which shortens the treatment time by allowing less opportunity for tumour cell repopulation. The use of 3DCRT with larger radiation fraction size should maintain satisfactory treatment related toxicity while permitting the potential gains of accelerated fractionation and dose escalation. In this study, patients with limited stage SCLC who are eligible will be treated with a large field (low dose) radiotherapy followed by accelerated 3DCRT given concurrently with standard Cisplatin Etoposide chemotherapy.