Grubbs C J, Moon R C, Squire R A, Farrow G M, Stinson S F, Goodman D G, Brown C C, Sporn M B
Science. 1977 Nov 18;198(4318):743-4. doi: 10.1126/science.910158.
Transitional cell carcinoma was induced in the bladders of male Fischer rats by 12 oral doses of the carcinogen N-butyl-N-(4-hydroxybutyl)nitrosamine. Feeding of 13-cis-retinoic acid after completion of carcinogen treatment diminished the number and severity of cancers and other proliferative lesions of the bladder.