title: Inhibition of mammary and urinary bladder carcinogenesis by a retinoid and a maleic anhydride-divinyl ether copolymer (MVE-2).
abstract: N-(4-hydroxyphenyl)retinamide (4-HPR), a synthetic retinoid, and MVE-2, a maleic anhydride-divinyl ether copolymer, were both effective inhibitors of mammary carcinogenesis induced in Sprague-Dawley rats by N-methyl-N-nitrosourea and of urinary bladder carcinogenesis induced in C57BL/6 x DBA/2F1 mice by N-butyl-N-(4-hydroxybutyl)-nitrosamine. However, combined administration of 4-HPR and MVE-2 was no more effective in cancer inhibition than was either agent alone. Retinoids and maleic anhydridedivinyl ethers may exhibit a mechanistic or metabolic antagonism which precludes an additive or synergistic interaction in inhibiting chemical carcinogenesis.
mesh_terms: D000818:Animals; D004032:Diet; D005260:Female; D017313:Fenretinide; D008325:Mammary Neoplasms, Experimental / Q000139:chemically induced / Q000517:prevention & control*; D051379:Mice; D009374:Neoplasms, Experimental / Q000139:chemically induced / Q000517:prevention & control; D011108:Polymers / Q000494:pharmacology*; D011713:Pyran Copolymer / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors; D014212:Tretinoin / Q000031:analogs & derivatives* / Q000494:pharmacology; D001749:Urinary Bladder Neoplasms / Q000139:chemically induced / Q000517:prevention & control*
chemical_list: D011108:Polymers; D017313:Fenretinide; D011713:Pyran Copolymer; D014212:Tretinoin