An extract of the Minari plant containing a component which prevents cancer and cancer metastasis. A Minari extract which is useful for the prevention of cancer and cancer metastasis induced by urethane (EC (ethylcarbamate)), which is a carcinogen present in fermented foods or alcoholic beverages, or by NNK[{(4-N-methyl-N-nitrosoamino)-1-(3-pyridyl)-1-buta none)}], which is a carcinogen present in cigarette smoke.