1) Dietary supplement 
An isoflavone found in soy products. Soy isoflavones are being studied to see if they help prevent cancer.
<chemical> An isoflavonoid derived from soy products. It inhibits protein-tyrosine kinase and topoisomerase-II (DNA topoisomerase (ATP-hydrolysing)) activity and is used as an antineoplastic and antitumour agent. Experimentally, it has been shown to induce g2 phase arrest in human and murine cell lines. ... Pharmacological action: anticarcino...
(= 4,5,7-trihydroxyisoflavone) Inhibitor of protein tyrosine kinases. Competes at ATP binding site and will inhibit other kinases to some extent.