EGFR and lung cancer: In any case, by using exosomal epidermal growth factor receptor (EGFR) and programmed death-ligand 1 (PD-L1) as biomarkers, they described the successful lung cancer diagnosis and SPR detection of exosomal EGFR at concentrations as low as 2 × 1010 exosomes mL−1, by exhibiting better sensitivity than ELISA.