CD274 and gastric cancer: PD-L1 positivity was observed in 31.2% gastric cancers, of which frequency was within the range (5.1%-65.0%) of previous studies in worldwide [9, 10, 16, 22, 23] and was more closely compatible with the PD-L1 rates (29.6%-50.8%) reported in the same Far East Asian population [8, 22-30].