LGALS3BP and glioblastoma: As a first step to investigate the secretion of vesicular LGALS3BP by GBM cells in vivo, serum‐derived EVs were purified from nude mice harbouring GCh6 xenograft, characterized for EVs‐associated marker Alix by WB (Fig. S4A), and further analysed by ELISA (Fig. 3A,B).