Using an anti-BSH mAb, the authors examined the in vitro delivery of 10B from the immunoliposomes to different tumor cell lines: BSH was detected in U87 glioblastoma cells overexpressing WT EGFR or the tumorigenic mutation EGFRvIII, but not in primary astrocytes and the parental U87 cells, lacking EGFR expression. Here, EGFR is linked to glioblastoma.