Additionally, the classification of the PD-L1 expression rate in 19 EBUS-TBNA specimens obtained from SCLC patients according to the three categories is depicted in Figure 4B. The concordance rate of the PD-L1 expression between EBUS-TBNA and matched TBB specimens obtained from SCLC patients was 89.5% (17/19). This evidence concerns the gene CD274 and small cell lung carcinoma.