Study of Radiation Dose Intensity Concurrent With Chemotherapy For Limited Stage Small Cell Lung Cancer

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.

Primary Objective: To determine the maximum tolerable dose of radiotherapy for SCLC

Secondary Objectives:

1. To assess treatment toxicity
2. To assess quality of life and retention of pulmonary function
3. To assess progression-free survival on this regimen

Schema: Eligible patients will receive 4 cycles of Cisplatin Etoposide chemotherapy. Thoracic radiotherapy will be given concurrently starting with cycle #2 of chemotherapy. Only one dose level will be open at a time. Four dose levels are planned all delivered in 25 fractions once daily over 5 weeks:

1. 50 Gy (2 Gy per fraction),
2. 58 Gy,
3. 62 Gy,
4. 65 Gy. Patients, who achieve a complete response at the end of chemotherapy and thoracic radiotherapy, will receive prophylactic cranial irradiation.

Evaluation and Follow-up: Patients will be assessed and evaluated at least weekly during radiation therapy. Following treatment, patients will be seen 1 month after the completion of treatment, then every 3 months until 2 years, then every 6 months. Chest x-rays will be performed at each follow-up. CT scan of chest and pulmonary function tests will be performed every 6 months for the first 2 years, then yearly.