Objective To investigate the synergistic effect of Tamoxifen(TAM) and Simvastatin(SIV) on MCF-7human breast cancer cells(MCF-7). Methods MTT assay was used to detect antiproliferative effects of TAM,SIV and TAM + SIV on growth of MCF-7 cells. Synergistic interaction between the two drugs was appraised in vitro by using the combination index(CI) method. The cell apoptosis morphological change was detected by the fluorescent microscope. The diversifications of the cell the apoptosis in TAM,SIV and TAM + SIV w...