Figure 5From: A gallotannin-rich fraction from Caesalpinia spinosa (Molina) Kuntze displays cytotoxic activity and raises sensitivity to doxorubicin in a leukemia cell line Adjuvant activity of the P2Et fraction on the K562 and MCF7 cell lines. K562 (A) or MCF7 (B) cells were treated with the P2Et fraction or ethanol (negative control) for 6 h, washed and treated with doxorubicin (Dx), vincristine (Vt), camptothecin (Ct) or taxol (Tx) at the concentrations shown over a 48 h period. Cell cytotoxicity was estimated using the MTT assay. Data represent three independent experiments. *** (p < 0.001).Back to article page