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Background: Recent data has demonstrated improvements in overall survival in patients with advanced non-small cell lung cancer (NSCLC) treated with nivolumab. Radiation may augment the immune response through abscopal effects - evidence of tumour control at sites other than those irradiated. We hypothesize that the addition of stereotactic ablative body radiotherapy (SABR) to immunotherapy with nivolumab will improve progression free survival (PFS) compared with nivolumab alone. Methods: DESIGN: Open label, randomised phase II trial with 25 sites across Australia and New Zealand. ELIGIBILITY: Metastatic NSCLC progressing after 1 or 2 lines of chemotherapy with an extrapulmonary metastasis suitable for SABR. STRATIFICATION: Age, lines of chemotherapy, histology and treating institution. TREATMENT: A single dose of SABR (18-20Gy) plus nivolumab or nivolumab alone (240mg 2 …