Flavonoid has potential bioactivity as anticancer agents. The flavonoid of cultivated tobacco (Nicotiana tabacum), locally known as "Kasturi", leaves was screened for its cytotoxicity against MCF-7 human breast cancer cells and non-transformed Vero cells (African normal cell kidney line) in different concentrations. This study aimed to examine the cytotoxic potential of the flavonoid of Kasturi tobacco leaves against MCF-7 human breast cancer cells. Flavonoid obtained from methanolic extracts

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... Kasturi tobacco leaves, which have been purified from nicotine. The flavonoid of Kasturi tobacco leaves with concentrations of 20 to 640 μg/mL were exposed to MCF-7 and Vero cells for 24 h. Cell viability was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay. Flavonoid of Kasturi tobacco leaves with concentrations of 160 μg/mL decreased the MCF-7 cell viability more than 50%, with an inhibitory concentration 50 (IC50) value of 148.41 μg/mL. Meanwhile, it inhibited 50% of Vero cell viability at 255.35 μg/mL. The flavonoid of Kasturi tobacco leaves has cytotoxic activity on MCF-7 cells, and might be a potential alternative agent for human breast cancer therapy.Keywords: flavonoid, tobacco leaves, human breast cancer cells, anticancer activity