To perform clonogenicity assay42 (link), breast cancer cells were treated with BITC as indicated for 10-days; colonies were counted. Anchorage-independent growth of breast cancer cells in the presence of BITC was assayed by colony formation in soft agar43 (link). Cell viability assay was performed using a commercially available XTT assay kit (Roche Applied Science, Indianapolis, IN). Mammosphere assays were performed as previously described44 (link) and spheres (>50 μm) were counted. For apoptosis analysis, cells were stained with Annexin-V and propidium iodide (PI) followed by fluorescence-activated cell sorting (FACS) analysis.
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