KRAS and ERBB-family genetic alterations affect response to PD-1 inhibitors in metastatic non-squamous NSCLC

Background: Programmed cell death -1 (PD-1) PD-ligand 1 (PD-L1) inhibitors represent a novel therapeutic option for advanced chemotherapy-pretreated non-small cell lung cancer (NSCLC) patients, leading to a significant improvement in median and long-term survival. However, about 50% patients do not benefit from therapy and experience rapid disease progression. PD-L1 expression and tumor mutational burden (TBM) have been proposed as biomarker of...