EGFR and non-small cell lung carcinoma: This phase 2 clinical trial aimed to investigate the efficacy and safety of SMET12 plus toripalimab and chemotherapy among advanced non-small-cell lung cancer (NSCLC) patients tested positive for EGFR protein, including treatment-naïve patients, patients with resistance to first-line immune checkpoint inhibitors-containing therapy and EGFR-mutated patients with resistance to first-line EGFR tyrosine kinase inhibitors (TKIs), and to examine the associations of lymphocyte numbers and differentiation patterns with therapeutic efficacy among advanced NSCLC patients.