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Enhanced malignant progression of mouse skin tumors by the free-radical generator benzoyl peroxide. 1986

J F O'Connell, and A J Klein-Szanto, and D M DiGiovanni, and J W Fries, and T J Slaga

Chemical carcinogenesis in mouse skin can be divided into the processes of initiation, promotion, and progression. The free-radical generator benzoyl peroxide is moderately active during the promotion stage. Repetitive treatment of mouse benign skin tumors (papillomas) with benzoyl peroxide (20 mg, twice weekly) increased the number of cumulative carcinomas per group by 325% and the number of keratoacanthomas by 44% compared to tumor-bearing Sencar mice treated with the promoter 12-O-tetradecanoylphorbol-13-acetate. The lack of increase in the number of cumulative papillomas per group due to benzoyl peroxide treatment suggests that benzoyl peroxide enhanced the progression of preexisting papillomas. The ability of benzoyl peroxide to enhance the progression of benign tumors to cancer should be considered when determining the human risk from exposure to this widely used chemical agent; in addition, biological assays specifically testing malignant progression may be essential and beneficial for determining an agent's carcinogenic risk.

UI MeSH Term Description Entries
D007636 Keratoacanthoma A benign, non-neoplastic, usually self-limiting epithelial lesion closely resembling squamous cell carcinoma clinically and histopathologically. It occurs in solitary, multiple, and eruptive forms. The solitary and multiple forms occur on sunlight exposed areas and are identical histologically; they affect primarily white males. The eruptive form usually involves both sexes and appears as a generalized papular eruption. Keratoacanthomas
D008815 Mice, Inbred Strains Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations, or by parent x offspring matings carried out with certain restrictions. All animals within an inbred strain trace back to a common ancestor in the twentieth generation. Inbred Mouse Strains,Inbred Strain of Mice,Inbred Strain of Mouse,Inbred Strains of Mice,Mouse, Inbred Strain,Inbred Mouse Strain,Mouse Inbred Strain,Mouse Inbred Strains,Mouse Strain, Inbred,Mouse Strains, Inbred,Strain, Inbred Mouse,Strains, Inbred Mouse
D010212 Papilloma A circumscribed benign epithelial tumor projecting from the surrounding surface; more precisely, a benign epithelial neoplasm consisting of villous or arborescent outgrowths of fibrovascular stroma covered by neoplastic cells. (Stedman, 25th ed) Papilloma, Squamous Cell,Papillomatosis,Papillomas,Papillomas, Squamous Cell,Papillomatoses,Squamous Cell Papilloma,Squamous Cell Papillomas
D010545 Peroxides A group of compounds that contain a bivalent O-O group, i.e., the oxygen atoms are univalent. They can either be inorganic or organic in nature. Such compounds release atomic (nascent) oxygen readily. Thus they are strong oxidizing agents and fire hazards when in contact with combustible materials, especially under high-temperature conditions. The chief industrial uses of peroxides are as oxidizing agents, bleaching agents, and initiators of polymerization. (From Hawley's Condensed Chemical Dictionary, 11th ed) Peroxide
D003043 Cocarcinogenesis The combination of two or more different factors in the production of cancer. Cocarcinogeneses
D005260 Female Females
D005609 Free Radicals Highly reactive molecules with an unsatisfied electron valence pair. Free radicals are produced in both normal and pathological processes. Free radicals include reactive oxygen and nitrogen species (RONS). They are proven or suspected agents of tissue damage in a wide variety of circumstances including radiation, damage from environment chemicals, and aging. Natural and pharmacological prevention of free radical damage is being actively investigated. Free Radical
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001585 Benzoyl Peroxide A peroxide derivative that has been used topically for BURNS and as a dermatologic agent in the treatment of ACNE and POISON IVY DERMATITIS. It is used also as a bleach in the food industry. Benzoyl Superoxide,Dibenzoyl Peroxide,Diphenylglyoxal Superoxide,PanOxyl,Peroxide, Benzoyl,Peroxide, Dibenzoyl,Superoxide, Benzoyl,Superoxide, Diphenylglyoxal
D012878 Skin Neoplasms Tumors or cancer of the SKIN. Cancer of Skin,Skin Cancer,Cancer of the Skin,Neoplasms, Skin,Cancer, Skin,Cancers, Skin,Neoplasm, Skin,Skin Cancers,Skin Neoplasm

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