Extracts fromWT and SB tomato, and those from other anthocyanin-containing plant tissues were tested for proliferation inhibitory effect on human colon (HT-29) and ovarian (HeLa) cancer cells by using 3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyltetrazolium bromide (MTT) assay, at five different concentrations of the extract.