ABSTRACT
Chemoprevention is currently regarded as one of the most promising avenues of cancer control. In the search for chemopreventive dietary plants and phytochemicals, the author has explored anti-tumor promotimg phytochemicals of vegetables and fruits in several Asian countries, using an inhibition test of tumor promoter-induced Epstein-Barr virus (EBV) activation. Extensive <i>in vitro</i> screening tests have found several dietary plants from subtropical zones to possess high potential. In particular, plants in families commonly ingested for purposes other than their nutritive value (<i>i.e.</i> as flavors, condiments, and occasionally traditional medicines) were shown to contain potent anti-tumor promoters. Of more than 50 <i>in vitro</i> anti-tumor promoters identified thus far, cancer preventive properties of 4 compounds from zingiberaceous (1′-acetoxychavicol acetate and zerumbone) and rutaceous (auraptene and nobiletin) plants have been further studied. The results of animal model experiments as well as modes of action, including anti-inflammation associated activities, are described. The present status of chemoprevention with food phytochemicals is also discussed.<br>