A-B. LU-NB-3 PDX, SK-N-BE(2) c and SK-N-SH cells were treated with indicated concentrations of cisplatin and/or 0.36 μM IBL-202, 0.05 μM IBL-301, or 0.05 μM IBL-302 for 48 hours. Cell viability determined by CellTiterGlo. Graphs show mean values and SEM from three independent experiments. Theoretical additive curves were evaluated by calculating the combination index (CI) based on the Bliss Independence model. 