MKI67 and glioblastoma: Immunofluorescent staining of Ki67 showed that the Ki67 levels of the IR plus UTMD group were much lower than those of single IR-exposed glioblastoma-bearing mice [(9.6 ± 1.5)% vs. (34.0 ± 6.4)%, P < 0.01], indicating a significant decrease of proliferating cells in glioblastoma (Fig. 9e).