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All tested compounds were dissolved in DMSO (1-100µM solution ) and subsequently diluted in the culture medium before treatment of the cultured cells . Tested cells were plated in 96-well plates at a density 2¡Á103cells /well /100mL of the proper culture me dium and treated with the compounds at 1-10 0 µM for 72 h. In parallel , the cells treated with 0 .1 % DMSO served as control . An MTT [3-(4,5-dime thylthiazol-2-yl)-2,5-diphenyl tetrazolium-bromide ] assay (Roche Molecular Biochemicals , Cat. No.11465007001) was performed 4h later according to the instructions provided by Roche. This assay was based on the cellular cleavage of MTT into formazane which is soluble in cell culture medium. Any absorbance caused by formazan was measured at595 nm with a microplate reader ( BIO-RAD , model 680 ), which is directly proportional to the number of living cells in culture. Three types of cells were used in these assays , PC3 (prostate cancer) ,BGC 823 (human gastric cancer ) and Bcap37 ( breast cancer) cell lines , provided by ATCC and cultivate din RPMI 1640 ( for PC3,BGC823 and Bcap37) supplemented with 10% fetal bovine serum. Tissue culture reagents were obtained from Gibco BRL [14] .The experiment was performed in triplicate. The percentage cytotoxicity was calculated using the formula.

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