Application of flavonoids compounds in breast cancer resistance

The invention discloses application of four kinds of known flavonoids compounds to treatment of breast cancers. The four kinds of known flavonoids are known compoundes obtained by separating fruit of sinopodophyllum emodi and have structures shown as structural formulas 1-4 in the specification. Experiments on the effect of the kinds of compounds on inhibiting human breast cancer cells show that the series of compounds have a favorable effect on inhibiting the proliferation of the breast cancer cells.