Possible anti-tumor promoting properties of a total of 40 methanol extracts from Thai edible plants, including 5 non-edible species, were estimated in vitro by an inhibition test of tumor promoter-induced Epstein-Barr virus (EBV) activation. Fourteen species (35% of the total) were found to be strongly active. In addition, cardamonin (2′,4′-dihydroxy-6′-methoxychalcone) was identified as a potently active constituent (IC50 = 3.1μM) of Boesenbergia pandurata (Zingiberaceae), suggesting it to be an effective anti-tumor promoter.
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Murakami et al. (1993) studied this question.