Taiwanhomoflavone B is cytotoxic with ED(50) values of 3.8 and 3.5 microg/ml, against KB oral epidermoid carcinoma and Hepa-3B hepatoma cells, respectively.
Taiwanhomoflavone A is cytotoxic with ED50 values of 3.4, 1.0, 2.0 and 2.5 microg ml, respectively, against KB epidermoid carcinoma of nasopharynx, COLO-205 colon carcinoma, Hepa-3B hepatoma, and Hela cervix tumor cells.