HOXD4 and glioblastoma: Studies conducted in U-118, U-138, and normal human astrocyte glioblastoma cell lines showed that Hoxc8, Hoxc10, Hoxd1, Hoxd4, Hoxd9, Hoxd10, and Hoxd13 were expressed in glioblastoma cells, while they were not detected in healthy tissue (Guo et al., 2016).