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Metro G, et al. Efficacy of Pembrolizumab Monotherapy in Patients with or without Brain Metastases from Advanced Non-Small Cell Lung Cancer with a PD-L1 Expression ≥50%. Journal of Immunotherapy 43: 299-306, No. 9, Nov 2020. Available from: URL: http://doi.org/10.1097/CJI.0000000000000340