ERBB2 and glioblastoma: Apart from the clinical use of native, unmodified NK cells, therapies with engineered NK cells have been utilized in multiple clinical and preclinical studies to target a number of ligands which are overexpressed in GBM, including HER2 [78], IL-13Rα2 [79], EGFR [80], EGFRvIII [80], CSPG4 [77], and CD133 [81].