The combination of MEDS433 with classical antileukemic agents results in near-additive effects. (A) Apoptosis induced by MEDS433, Ara-C and their combination on MV4-11 (left panel, n = 4) and THP1 (right panel, n = 3) cells. (B) Apoptotic rate (left panel) and cell viability (right panel) of THP1 cells treated with MEDS433, idarubicin or both (n = 3). (C) Apoptotic rate (left panel, n = 3) and cell viability (right panel, n = 3) of THP1 cells treated with decitabine, MEDS433 or both, with or without physiological levels of uridine (5 µM). If not otherwise specified, MEDS433 was utilized at 0.1 µM. Apoptosis and cell counts were evaluated after 3 days of treatment. DMSO: dimethyl sulfoxide. M: MEDS433. A: Ara-C. Ida: idarubicin. Dec: decitabine. Statistical significance: Anova/Tukey, * p < 0.05; ** p < 0.01; *** p < 0.001; **** p < 0.0001.