To provide a more direct evidence that salinomycin and TRAIL synergize in inducing cell death of glioblastoma cells, we plotted the cell viability data giving the 100% value both at measurements performed either in the absence (0) or in the presence of 1.2 μM salinomycin (Fig. 2B). The gene discussed is TNFSF10; the disease is glioblastoma.