CD8A and neoplasm: After T cell‐mediated transport into tumor regions, the release of Hb and CAT from NPs alleviates tumor hypoxia, activating CD8+ T cell immune responses to treat colorectal cancer.[43] Given that dendritic cells are the most prominent antigen‐presenting cells capable of capturing, processing, and presenting tumor‐associated antigens (TAAs) to trigger T cell‐mediated tumor‐specific immunity,[73, 118] previous studies designed dendritic cell membrane‐coated AIE photosensitizer NPs (DC@AIEdots).