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Glioblastoma multiforme (GBM) is the most common as well as one of the most malignant types of brain cancer. Despite progress in development of novel therapies for the treatment of GBM, it remains largely incurable with a poor prognosis and a very low life expectancy. Recent studies have shown that oleandrin, a unique cardiac glycoside from Nerium oleander, as well as defined extract (PBI-05204) that contains this molecule, inhibit growth of human glioblastoma, and modulate glioblastoma patient-derived stem cell-renewal properties. The present study aimed to investigate the radiosensitization of PBI-05204 in glioblastoma using both in vitro and in vivo cancer models as well as to explore the potential mechanism of actions in GBM. The radiosensitizing effect of PBI-05204 was assessed against human GBM U87MG, U251, T98G and A172 cell lines as well as their relevant xenograft and orthotopic models …