CD274 and neoplasm: Some authors described a poor correlation of PD-L1 expression on tumour cells between biopsy and corresponding surgical specimens (Haragan et al. 2019; Ilie et al. 2016), whereas other studies found a good concordance of PD-L1 testing between biopsy samples and matches resected specimens (Kitazono et al. 2015; Heymann et al. 2017; Tsunoda et al. 2019; Zhao et al. 2021).