MKI67 and neoplasm: In addition, immunohistochemistry (IHC) staining of the proliferation marker Ki‐67 in tumors showed that the proportion of Ki‐67 positive cells in the RSL3@LIPO@GEL treated group was significantly lower than that in the control group, unloaded hydrogel group, and RSL3@LIPO group, which were correlated with their tumor sizes (Figure 6h,i).