a–d Examples of discordant PD-L1 TPS in LTRs and CBs. False-positive case (case 39): LTR with TPS of 10% (×100) (a) and corresponding CB with TPS of 85% (×630) (b). False-negative case (case 43): LTR with TPS of 55% (×100) (c) and corresponding CB with TPS of 0% (×630) (d). Asterisks indicate tumor areas of PD-L1 expression. Arrows indicate tumor areas without PD-L1. PD-L1, programmed death ligand-1; TPS, tumor proportion score; LTR, lung tumor resection; CB, cell block.