BCP also proved effective in MM.1S cells and the more resistant MM.1R cell line at concentrations of 50 μM and 100 μM, thus reducing the cell viability of cancer cells and not affecting normal cells, as demonstrated by the MTT assay and trypan blue staining; in particular, the fluorescent marking with FDA confirmed the MTT results and demonstrated that BCP significantly reduced the number of viable cells. This evidence concerns the gene OPN1SW and cancer.