A few studies (Sound et al. 2018; Rakha et al. 2017; Reisenbichler et al. 2020; Wang et al. 2021) have examined the reproducibility, in NSCLC and breast cancer, of PD-L1 interpretation concordance between inter-department pathologists and intra-department pathologists. This evidence concerns the gene CD274 and non-small cell lung carcinoma.