The application of epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitor (TKI) has significantly improved the survival of patients with EGFR-mutant non-small cell lung cancer (NSCLC). However
there are still a portion of patients with poor efficacy and prognosis. Therefore
it is urgently needed to find effective emerging prognostic markers. In the past few years
tumor mutational burden (TMB) was mainly used to screen patients who benefitted from immunotherapy and predict the efficacy. Recently
there are also corresponding exploratory studies on EGFR-mutant NSCLC. In this review
we summarized the challenges of TMB test and latest clinical research in EGFR-mutant advanced NSCLC.