(A) 48-hour cell viability of Saos-2 cells incubated with pTP-Me (20, 40, 60, 80, 100, 200, 300, 400, and 500 μM) in combination with BAY (0, 8, 12, 16, and 20 μM). (B) 48-hour cell viability of Saos-2 cells incubated with BAY at different concentrations (4, 8, 12, 16, and 20 μM). (C) ALP inhibitor (DQB, 10 μM) significantly rescues Saos-2 cells treated by the combination of pTP-Me (100 μM) and BAY (10 μM). ***: p<0.001. (D) Normalized Isobologram,34 (E) Combination Index (CI)34 plot and (F) Dose-Reduction Index (DRI)34 plots for the combination of pTP-Me and BAY. All the analysis shown in (C-E) was based on the combination: pTP-Me 20-500 μM and BAY 12, 16, 20 μM, 27 data points in total.