CD86 and neoplasm: The NP‐G/P+H‐treated tumor cells significantly enhanced the surface expression of maturation markers on DCs (CD80+CD86+) by 3.86, 3.27, and 1.17 folds compared with PBS, NP‐G/P, and HIFU‐treated tumor cells, respectively (Figure 4L; Figure S20, Supporting Information), indicating HIFU can promote tumor cell ferroptosis‐triggered DC maturation.