CD274 and non-small cell lung carcinoma: The concordance of PD-L1 expression between the 100 paired histological and cytological NSCLC specimens was evaluated in several ways, including κ, OPA, PPA, and NPA (with histology as standard for PPA and NPA) for the different PD-L1 cut-offs ≥1%, ≥5%, ≥10%, and ≥50%.