Prevalence of Epidermal Growth Factor Receptor and Programmed Death Ligand 1 Testing in a Population-Based Lung Cancer Surgical Resection Cohort from 2018 to 2022.

Background: Biomarker-directed therapy requires biomarker testing. We assessed the patterns of epidermal growth factor receptor (EGFR) and programmed death ligand 1 (PDL1) testing in a non-small cell lung cancer (NSCLC) resection cohort. We hypothesized that testing would increase but be unevenly distributed across patient-, provider- and institution-level demographics.