CD8A and neoplasm: Compared with the PD-1−CD8+ TIL ACT, PD-1+CD8+ TIL ACT altered the TIL composition in SCC7 tumours: the percentage of CD8+ TILs was increased, and PD-1+CD8+ TILs also increased slightly in PD-1+CD8+ TIL ACT group (Fig. 6c, d).