GZMB and neoplasm: The results demonstrated that the granzyme B+ CD8+ cytotoxic T cell (CD8_4) density was negatively correlated with cell densities of B7H4+ tumor cells (tu_7; r = −0.47, p = 0.0006) and tu_9 (r = −0.38, p = 0.006; Figure 5B), suggesting that these CD8+ cytotoxic cells are infiltrating the tumor mass and actively depleting B7H4+ ovarian cancer cells in LTS.