SLCO1A2 and glioblastoma: The mean average intensity of OATP1A2 and OATP4A1 was significantly higher in IBA1+ cells than in blood vessels (OATP1A2: P < .0300, OATP4A1: P < .0309) but was relatively similar for OATP2B1 and OATP1C1 within GBM tumor tissue.