TFRC and glioblastoma: Recently, a transferrin receptor antibody has been used to assist nanoparticles containing α‐CTLA‐4, α‐PD‐1, or both to cross the BBB, leading to significantly prolonged survival in glioblastoma‐bearing mice.[168] Similarly, conjugation of nanoparticles with p‐hydroxybenzoic acid, which targets dopamine receptor and promotes BBB penetration via RMT, has been used to successfully deliver α‐PDL1 into the brain of mice for treatment of glioma.