(a) Effect of GLUT1 inhibitor EDG on the cellular uptake of 1–4 and cisplatin (10 μM compounds, 17 h). (b) Effect of externally added D-glucose and L-glucose (10 μM compounds, 17 h). (c) Effect of EDG on the IC50 values (72 h assay). (d) Effect of EDG, Ctd, and their mixture on the cellular up-take of 1, 4 and oxaliplatin (10 μM compounds, 8 h). All experiments were done in A2780 cells and cellular uptake in absence of inhibitor was normalized to 100%. Data represent the mean ± SD of at least three or more replicates. The asterisks denote differences are statistically significant (*p < 0.01, **p < 0.001), ns = not statistically significant.