Survival of MCF-7 cells by combined treatment with curcumin and MMC. (A) MCF-7 cells were incubated with curcumin at doses of 5, 10, 20, 40, or 80 μmol/L for 48 h. (B) MCF-7 cells were treated with the combination of curcumin at 40 μmol/L and MMC at 0.1, 0.5, 2.5, 5, or 7.5 μmol/L for 48 h. bP<0.05 vs 5 μmol/L MMC alone. Values are mean±SD from 3 independent experiments.