Inflammatory CD11b+ cells were used as active carriers to deliver DOX‐loaded nanoparticles to areas with poor tumor vascularization.[100] Trans‐cyclooctene‐modified CD11b antibodies were used as a connector to bind CD11b+ cells to the surface of 1,2,4,5‐tetrazine (TZ)‐functionalized mesoporous silica nanoparticles (MSNs‐TZ) in vivo (Figure 11). Here, ITGAM is linked to neoplasm.