CD274 and neoplasm: Programmed death‐ligand 1 expression by IHC was analyzed for 335 samples (188 AD and 147 SCC), and of these, 103 (55 AD and 48 SCC) were PD‐L1 positive (> 1% positive tumor cells) and 41 (23 AD and 18 SCC) had more than 50% PD‐L1‐positive tumor cells.