BACKGROUND: PD-L1 expression currently represents the only validated predictive biomarker for immune checkpoint inhibition in metastatic non-small cell lung cancer (NSCLC) in the clinical routine, but has limited value to distinguish responses. Assessment of KRAS and TP53 mutations (mut) as surrogate for an immunosupportive tumor microenvironment (TME) might help to close this gap. PATIENTS AND METHODS: 696 consecutive patients with PD-L1 high (
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