Determination of IC
values. The 50% inhibition concentration (IC50) values of the four plant extracts JCP1, PS, ZI, JCP2 on MCF-7 cancer were measured by MTS assay. The four extracts reduced viability of MCF-7 cells in a dose dependent manner. IC50 values (see Table 1) were calculated from the dose response curves by nonlinear regression. Background absorbance was corrected against MTS reaction without cells and control treatment (0.1% DMSO).