Addition of Radiotherapy to Standard Medical Treatment for Stage IV NSCLC

Primary objective: To assess whether the addition of radiotherapy to the remaining thoracic tumor burden following standard medical treatment results in a superior quality of life measured with lung cancer symptom scale (LCSS) in patients with stage IV non-small cell lung cancer. The comparison will be made at three months after randomization. Secondary objectives: Overall survival, progression-free survival, toxicity and longitudinal quality of life measurements. Design: Multicentre, randomized, phase III trial. Patients will be registered for the study up-front but randomization will be performed after evaluation of response, three months after initiating medical treatment with chemotherapy/ chemo-immunotherapy or immunotherapy. Randomization will be to thoracic radiotherapy or follow-up (1:1).