Dose-dependent effects of SWT on MCF-7 cell proliferation. To determine time- and dose-dependent growth rates of MCF-7 cells in the presence of SWT, cells were plated in 96-well plates (2,000 per well) in hormone-free medium for indicated times and cell growth was determined by MTS assay. Results are expressed as relative growth rate to the control cells with no drug treatment. Points, means from six replicates; bars, S.D. * p < 0.05 for all treatment groups compared to untreated control.