ROS1 and non-small cell lung carcinoma: In eligible patients (Performance status 0–2 and no contraindication for immunotherapy) with metastatic NSCLC irrespective of histology with PD-L1 level ≥ 50% and with none of the driver mutations (EGFR, ALK, ROS-1, BRAF), Pembrolizumab is recommended as first-line monotherapy.