The present invention relates to an oil/fat-containing composition for suppressing carcinogenesis, the composition including a solution produced by bringing a hydrophobic extract of licorice, which has been produced by bringing licorice into contact with an alcohol, into contact with an oil/fat. According to the present invention, there are provided an oil/fat-containing composition for prevention or treatment of the cancer, which can act through oral administration, and can be safely ingested on a day-to-day basis, pharmaceuticals and foods containing the oil/fat-containing composition.