Fig. 1From: Cytotoxic and apoptogenic effect of hypericin, the bioactive component of Hypericum perforatum on the MCF-7 human breast cancer cell lineMTT assay results for cisplatin and hypericin in 24 h on MCF-7 cell line. Treatment of MCF-7 cells with 5 (μg/ml) concentration of hypericin showed 50 % cell death (=LD50 or IC50) (a, blue column), whereas LD50 of cisplatin in this time calculated to be 20 (μg/ml) (b, blue column).*P < 0.05, **P < 0.01Back to article page