ADGRL4 and glioblastoma: G55 is a stable xenograft cell line that was initially taken from a human GBM and passaged through nude mice.42, 43 Historically, this cell line has many characteristics of primary human GBM such as hypervascularity and necrosis and has been used by numerous studies focusing on invasive intracranial tumours.42, 43, 44, 45 Our data have shown that repetitive IV treatments with both pAb and mAb against ELTD1 led to a significant decrease in tumour volumes and increase in survival.