AQP9 and glioblastoma: Additionally, our highest differentially expressed probes in the direction of psPD include several chemokines (CXCL6, CXCL8, and CCL20), but also AQP9 and TREM1 which have been evidenced to be represented in glioblastoma by enrichment of AQP9+ leukocyte infiltration and TREM-1+ myeloid population enrichment in GB peri-necrotic zones [55, 56].