We previously described a radiosensitizing effect of USP9x in Jurkat cells.9 Therefore, we examined the influence of Mcl-1 and USP9x knockdown on apoptosis induction in glioblastoma cells following irradiation with 10 Gy by flow cytometry analyzing DNA fragmentation and ΔΨm dissipation. Here, USP9X is linked to glioblastoma.