Abstract: A carcinogenesis inhibitor having no side effect and having an excellent effect by oral administration. A carcinogenesis inhibitor containing a hydantoin derivative or a pharmaceutically acceptable salt thereof as an active ingredient shows an inhibiting action for polyp formation and for cell proliferation, and has no side effect and highly safe whereby it is very highly useful as a pharmaceutical agent and a food such as supplement which prevent the occurrence and progress of cancer, inhibits the recurrence and metastasis of cancer and further achieves the therapeutic effect.

Abstract: A carcinogenesis inhibitor having no side effect and having an excellent effect by oral administration. A carcinogenesis inhibitor containing a hydantoin derivative or a pharmaceutically acceptable salt thereof as an active ingredient shows an inhibiting action for polyp formation and for cell proliferation, and has no side effect and highly safe whereby it is very highly useful as a pharmaceutical agent and a food such as supplement which prevent the occurrence and progress of cancer, inhibits the recurrence and metastasis of cancer and further achieves the therapeutic effect.

Abstract: The present invention provides a method for reducing the occurrence and progress of intestinal polyps that may develop into colon cancer, and a carboxylic acid amide compound as an active component to reduce intestinal polyps, represented by the following Formula: wherein R is a lower alkyl group and X is a halogen an example being 4-diethoxyphosphinoylmethyl-N-(4-bromo-2-cyanophenyl) benzamide.

Abstract: A compound having a sructure of propanedioic acid represented by the following formula (1): (1) (wherein the ring A represents oxazole or the like; R1 represents an alkyl group, a lower alkoxy group or the like; R2 and R3 represent a lower alkyl group or the like; m represents 0 or an integer of 1 to 4, and m pieces of R1 may be the same or different from each other; and W represents an integer of 3 to 5) is useful as an agent for preventing or treating a gastrointestinal polyp and/or a malignant tumor, or an agent for preventing metastasis thereof.

Abstract: The present invention provides a medicine that has the effect of preventing the occurrence, inhibiting the progress and treatment of intestinal polyps that may develop into colon cancer, and relates to an intestinal polyp suppressor containing as an active component a carboxylic acid amide compound represented by the following General Formula: (wherein R is a lower alkyl group and X is a halogen), and in particular 4-diethoxyphosphinoylmethyl-N-(4-bromo-2-cyanophenyl)benzamide.