In our study, PD-L1 expression was observed in tumor cells (n = 33, 23.1% for 5% cut-off value) as well as in infiltrating immune cells (n = 43, 30.1% for 5% cut-off value), and a substantial number of tumors showed co-expression of PD-L1 in both tumor cells and immune cells (n = 18, 12.6% for 5% cut-off value). Here, CD274 is linked to neoplasm.