CD274 and non-small cell lung carcinoma: Several studies demonstrated that tumor tissue samples obtained via EBUS-TBNA are sufficient for PD-L1 testing, however, our study additionally investigates whether the subtype of NSCLC, size or location of tumor, and number of aspirations affect PD-L1 adequacy in EBUS-TBNA cytology specimens [1, 2, 7, 9].