The role of radiation therapy in small cell lung cancer.

Radiotherapy (RT) is fundamental to the care of patients diagnosed with small-cell lung cancer (SCLC). In the setting of limited stage disease (LS-SCLC), the addition of thoracic RT to chemotherapy (CHT) improves survival and local control, as demonstrated in decades-worth of randomized clinical trials and subsequent meta-analyses. In extensive stage disease (ES-SCLC), thoracic RT is invaluable in the palliation of chest symptoms but there are suggestions that its use in selected patients may potentially improve overall survival . Prophylactic cranial irradiation (PCI) also improves outcomes in SCLC. For LS-SCLC patients, it reduces brain metastases rates by half and improves overall survival with minimal impact on quality-of-life. Recently, favorable results for PCI with respect to survival and prevention of symptomatic brain disease have been observed for ES-SCLC patients with any response to CHT. Current phase III trials in SCLC RT include studies looking at the optimal dose and target for limited disease and the role of thoracic RT in extensive disease.